Difference between revisions of "Taxus"

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|familia=Taxaceae
 
|familia=Taxaceae
 
|genus=Taxus
 
|genus=Taxus
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|taxo_author=L.
 
|common_name=Yew
 
|common_name=Yew
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|habit=tree
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|lifespan=perennial
 
|Temp Metric=°F
 
|Temp Metric=°F
 
|jumpin=If this plant info box on watering; zones; height; etc. is mostly empty you can click on the edit tab and fill in the blanks!
 
|jumpin=If this plant info box on watering; zones; height; etc. is mostly empty you can click on the edit tab and fill in the blanks!
|image=Upload.png
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|image=TXbaccata.jpg
 
|image_width=240
 
|image_width=240
 +
|image_caption=''Taxus baccata'' (European Yew)
 
}}
 
}}
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'''''Taxus''''' is a [[genus]] of yews, small [[Pinophyta|coniferous]] [[tree]]s or [[shrub]]s in the yew family [[Taxaceae]]. They are relatively slow growing and can be very long-lived, and reach heights of 1-40 m, with trunk diameters of up to 4 m.{{Fact|date=September 2008}} They have reddish [[bark]], lanceolate, flat, dark-green [[leaf|leaves]] 1-4 cm long and 2-3 mm broad, arranged spirally on the stem, but with the leaf bases twisted to align the leaves in two flat rows either side of the stem.
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The [[conifer cone|seed cones]] are highly modified, each cone containing a single [[seed]] 4-7 mm long partly surrounded by a modified scale which develops into a soft, bright red [[berry]]-like structure called an [[aril]], 8-15 mm long and wide and open at the end. The arils are mature 6-9 months after pollination, and with the seed contained are eaten by [[Thrush (bird)|thrushes]], [[waxwing]]s and other [[bird]]s, which disperse the hard seeds undamaged in their droppings; maturation of the arils is spread over 2-3 months, increasing the chances of successful seed dispersal. The male cones are globose, 3-6 mm diameter, and shed their [[pollen]] in early spring. Yews are mostly [[Plant sexuality|dioecious]], but occasional individuals can be variably [[Plant sexuality|monoecious]], or change sex with time.
 +
 +
All of the yews are very closely related to each other, and some botanists treat them all as subspecies or varieties of just one widespread species; under this treatment, the species name used is ''Taxus baccata'', the first yew described scientifically.
 +
 +
[[Image:Taxus globosa foliage.jpg|left|thumb|Foliage of Mexican Yew]]
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The most distinct is the Sumatran Yew (''T. sumatrana'', native to [[Sumatra]] and [[Sulawesi|Celebes]] north to southernmost [[China]]), distinguished by its sparse, sickle-shaped yellow-green leaves. The Mexican Yew (''T. globosa'', native to eastern [[Mexico]] south to [[Honduras]]) is also relatively distinct with foliage intermediate between Sumatran Yew and the other species. The Florida Yew, Mexican Yew and Pacific Yew are all rare species listed as threatened or endangered.
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All species of yew contain highly [[poison]]ous [[alkaloid]]s known as [[taxane]]s, with some variation in the exact formula of the alkaloid between the species. All parts of the tree except the [[aril]]s contain the alkaloid. The arils are edible and sweet, but the seed is dangerously [[poison]]ous; unlike birds, the [[human]] stomach can break down the seed coat and release the taxanes into the body. This can have fatal results if yew 'berries' are eaten without removing the seeds first. Grazing animals, particularly [[cattle]] and [[horse]]s, are also sometimes found dead near yew trees after eating the leaves, though [[deer]] are able to break down the poisons and will eat yew foliage freely. In the wild, deer browsing of yews is often so extensive that wild yew trees are commonly restricted to cliffs and other steep slopes inaccessible to deer. The foliage is also eaten by the [[larva]]e of some [[Lepidoptera]]n [[insect]]s including [[Willow Beauty]].
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{{Inc|
 
{{Inc|
 
Taxus (ancient Latin name of the yew). Taxaceae, formerly named in the Coniferae. Yew. Ornamental woody plants, grown for their dark green foliage and the scarlet berry-like fruits.
 
Taxus (ancient Latin name of the yew). Taxaceae, formerly named in the Coniferae. Yew. Ornamental woody plants, grown for their dark green foliage and the scarlet berry-like fruits.
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Evergreen trees or shrubs: lvs. linear, without resin-ducts, pale or yellowish green beneath, usually 2-ranked: fls. usually dioecious, solitary and axillary, rarely terminal, small, appearing in early spring; staminate globose, composed of 4-8 stamens each, with 3-8 anther-cells attached to the peltate connective; pistillate consisting of a single terminal ovule with several bracts at the base: seed a bony nut surrounded or almost inclosed by a fleshy cup-shaped scarlet disk; cotyledons 2.—Six species are known. They are distributed throughout the northern hemisphere and in Amer. south to Mex. They are all very closely allied and have been considered geographical varieties of a single species. The wood is heavy, hard, close-grained, strong, elastic, and of reddish color. It is highly valued for cabinet-making and turning, and before the invention of gunpowder was in great request in England for the manufacture of bows. The foliage is poisonous to horses and cattle, but the berries are not.
 
Evergreen trees or shrubs: lvs. linear, without resin-ducts, pale or yellowish green beneath, usually 2-ranked: fls. usually dioecious, solitary and axillary, rarely terminal, small, appearing in early spring; staminate globose, composed of 4-8 stamens each, with 3-8 anther-cells attached to the peltate connective; pistillate consisting of a single terminal ovule with several bracts at the base: seed a bony nut surrounded or almost inclosed by a fleshy cup-shaped scarlet disk; cotyledons 2.—Six species are known. They are distributed throughout the northern hemisphere and in Amer. south to Mex. They are all very closely allied and have been considered geographical varieties of a single species. The wood is heavy, hard, close-grained, strong, elastic, and of reddish color. It is highly valued for cabinet-making and turning, and before the invention of gunpowder was in great request in England for the manufacture of bows. The foliage is poisonous to horses and cattle, but the berries are not.
  
The yews are evergreen, usually small slow-growing trees or shrubs, with 2-ranked linear dark green leaves, insignificant flowers and showy berry-like red fruits. The best-known species is T. baccata, which is hardy as far north as Rhode Island and northwestern New York, and in some forms as far as Massachusetts, while T. cuspidata and T. canadensis are considerably hardier and thrive as far north as Canada; the other species are little known in cultivation. The yews are very desirable evergreens for park planting; they are densely clothed with dark green foliage and the pistillate plants are particularly beautiful in autumn when loaded with scarlet fruits. They are well suited for hedges and easily trimmed into any desired shape. They were formerly much used for fantastic topiary work (see e. g., G.C. II. 2:264, 265).
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The yews are evergreen, usually small slow-growing trees or shrubs, with 2-ranked linear dark green leaves, insignificant flowers and showy berry-like red fruits. The best-known species is T. baccata, which is hardy as far north as Rhode Island and northwestern New York, and in some forms as far as Massachusetts, while T. cuspidata and T. canadensis are considerably hardier and thrive as far north as Canada; the other species are little known in cultivation. The yews are very desirable evergreens for park planting; they are densely clothed with dark green foliage and the pistillate plants are particularly beautiful in autumn when loaded with scarlet fruits. They are well suited for hedges and easily trimmed into any desired shape. They were formerly much used for fantastic topiary work.
  
That the typical tree-like, form of the yew is nowadays not much planted is chiefly due to its slow growth, but the numerous mostly shrubby garden forms are popular plants for small gardens. The yews thrive best in a moderately moist sandy loam and endure shade well. Large plants may be successfully transplanted if it is possible to secure a sufficient ball of earth with the roots. Propagation is by seeds, which do not germinate until the second year, and by cuttings taken early in autumn and kept during the winter in a cool greenhouse or frame; the varieties also often by grafting on the type in early spring in the greenhouse, or sometimes by layers. Plants raised from cuttings grow more slowly than grafted ones and cuttings of the type rarely grow into trees but usually into low-spreading shrubs (see M.D.G. 1898:565).
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That the typical tree-like, form of the yew is nowadays not much planted is chiefly due to its slow growth, but the numerous mostly shrubby garden forms are popular plants for small gardens. The yews thrive best in a moderately moist sandy loam and endure shade well. Large plants may be successfully transplanted if it is possible to secure a sufficient ball of earth with the roots. Propagation is by seeds, which do not germinate until the second year, and by cuttings taken early in autumn and kept during the winter in a cool greenhouse or frame; the varieties also often by grafting on the type in early spring in the greenhouse, or sometimes by layers. Plants raised from cuttings grow more slowly than grafted ones and cuttings of the type rarely grow into trees but usually into low-spreading shrubs.
  
T. floridana, Chapm. Bushy tree, 25 ft. high or sometimes shrubby: lvs. slender, 3/4 - 1 in. long, dark green. Fla. S.S. 10:515. —T. koraiensis, Hort.-Cephalotaxus Harringtonia var. fastigiata. —T. Wallichiana, Zucc. Tree, to 100ft.: lvs. gradually long-acuminate, 1-1 1/2 in. long. Himalayas, Malay Archipelago, Philippine Isls. Apparently not in cult.
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T. floridana, Chapm. Bushy tree, 25 ft. high or sometimes shrubby: lvs. slender, 3/4 - 1 in. long, dark green. Fla.—T. koraiensis, Hort.-Cephalotaxus Harringtonia var. fastigiata. —T. Wallichiana, Zucc. Tree, to 100ft.: lvs. gradually long-acuminate, 1-1 1/2 in. long. Himalayas, Malay Archipelago, Philippine Isls. Apparently not in cult.
 
}}
 
}}
  
{{Taxobox
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==Cultivation==
| color = lightgreen
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| name = ''Taxus''
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| image = TXbaccata.jpg
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===Propagation===
| image_width = 240px
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| image_caption = ''Taxus baccata'' (European Yew) shoot with <br>mature and immature cones
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| regnum = [[Plant]]ae
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===Pests and diseases===
| divisio = [[Pinophyta]]
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| classis = [[Pinophyta|Pinopsida]]
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| ordo = [[Pinales]]
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==Species==
| familia = [[Taxaceae]]
 
| genus = '''''Taxus'''''
 
| genus_authority = [[Carolus Linnaeus|L.]]
 
| subdivision_ranks = Species
 
| subdivision =  
 
 
''[[Taxus baccata]]'' - European Yew<br>
 
''[[Taxus baccata]]'' - European Yew<br>
''[[Taxus brevifolia]]'' - Pacific (or Western) Yew<br>
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''[[Taxus brevifolia]]'' - Pacific Yew, Western Yew<br>
 
''[[Taxus canadensis]]'' - Canadian Yew<br>
 
''[[Taxus canadensis]]'' - Canadian Yew<br>
''[[Taxus chinensis]]'' - Chinese Yew<br>
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''[[Taxus chinensis]]'' (syn. Taxus wallichiana var. chinensis) - Chinese Yew<br>
 
''[[Taxus cuspidata]]'' - Japanese Yew<br>
 
''[[Taxus cuspidata]]'' - Japanese Yew<br>
 
''[[Taxus floridana]]'' - Florida Yew<br>
 
''[[Taxus floridana]]'' - Florida Yew<br>
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''[[Taxus sumatrana]]'' - Sumatran Yew<br>
 
''[[Taxus sumatrana]]'' - Sumatran Yew<br>
 
''[[Taxus wallichiana]]'' - Himalayan Yew
 
''[[Taxus wallichiana]]'' - Himalayan Yew
}}
 
 
'''''Taxus''''' is a [[genus]] of yews, small [[Pinophyta|coniferous]] [[tree]]s or [[shrub]]s in the yew family [[Taxaceae]]. They are relatively slow growing and can be very long-lived, and reach heights of 1-40 m, with trunk diameters of up to 4 m. They have reddish [[bark]], lanceolate, flat, dark-green [[leaf|leaves]] 1-4 cm long and 2-3 mm broad, arranged spirally on the stem, but with the leaf bases twisted to align the leaves in two flat rows either side of the stem.
 
 
[[Image:YewSeed.jpg|left|thumb|European Yew cone (detail)]]
 
The [[conifer cone|seed cones]] are highly modified, each cone containing a single [[seed]] 4-7 mm long partly surrounded by a modified scale which develops into a soft, bright red [[berry]]-like structure called an [[aril]], 8-15 mm long and wide and open at the end. The arils are mature 6-9 months after pollination, and with the seed contained are eaten by [[Thrush (bird)|thrushes]], [[waxwing]]s and other [[bird]]s, which disperse the hard seeds undamaged in their droppings; maturation of the arils is spread over 2-3 months, increasing the chances of successful seed dispersal. The male cones are globose, 3-6 mm diameter, and shed their [[pollen]] in early spring. Yews are mostly [[Plant sexuality|dioecious]], but occasional individuals can be variably [[Plant sexuality|monoecious]], or change sex with time.
 
 
All of the yews are very closely related to each other, and some botanists treat them all as subspecies or varieties of just one widespread species; under this treatment, the species name used is ''Taxus baccata'', the first yew described scientifically.
 
 
[[Image:MexYew.jpg|left|thumb|Foliage of Mexican Yew]]
 
The most distinct is the Sumatran Yew (''T. sumatrana'', native from [[Sumatra]] and [[Celebes]] north to southernmost [[China]]), distinguished by its sparse, sickle-shaped yellow-green leaves. The Mexican Yew (''T. globosa'', native to eastern [[Mexico]] south to [[Honduras]]) is also relatively distinct with foliage intermediate between Sumatran Yew and the other species. The Florida Yew, Mexican Yew and Pacific Yew are all rare species listed as threatened or endangered.
 
 
All species of yew contain highly [[poison]]ous [[alkaloid]]s known as [[taxane]]s, with some variation in the exact formula of the alkaloid between the species. All parts of the tree except the arils contain the alkaloid. The arils are edible and sweet, but the seed is dangerously [[poison]]ous; unlike birds, the [[human]] stomach can break down the seed coat and release the taxanes into the body. This can have fatal results if yew 'berries' are eaten without removing the seeds first. Grazing animals, particularly [[cattle]] and [[horse]]s, are also sometimes found dead near yew trees after eating the leaves, though [[deer]] are able to break down the poisons and will eat yew foliage freely. In the wild, deer browsing of yews is often so extensive that wild yew trees are commonly restricted to cliffs and other steep slopes inaccessible to deer. The foliage is also eaten by the [[larva]]e of some [[Lepidoptera]]n [[insect]]s including [[Willow Beauty]].
 
 
[[Image:Taxus baccata flowers.jpg|thumb|right|Male cones of ''Taxus baccata'']]
 
===Uses and traditions===
 
Yew [[wood]] is reddish brown (with whiter sapwood), and is very springy. It was traditionally used to make [[bow (weapon)|bows]], especially the [[longbow]]. [[Ötzi]], the Chalcolithic [[mummy]] found in 1991 in the Austrian alps, carried an unfinished longbow made of yew wood. Consequently, it is not surprising that, in [[Norse mythology]], the god of the bow, [[Ullr]]'s abode had the name [[Ydalir]] (Yew dales). Most longbow wood used in northern Europe was imported from [[Iberian Peninsula|Iberia]], where climatic conditions are better for growing the knot-free yew wood required. The [[Eihwaz]] [[rune]] ᛇ is named after the yew, and sometimes also associated with the "evergreen" [[World tree]], [[Yggdrasil]].
 
  
[[image:English Yew close 250.jpg|right|thumb|Foliage of Irish Yew; note the leaves spreading all round the erect shoots]]
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Hybrids:
Yews are widely used in landscaping and ornamental [[horticulture]]. Over 400 [[cultivar]]s of yews have been named, the vast majority of these being derived from European Yew, Japanese Yew and the hybrid between them (''Taxus x media''). The most popular of these are the "Irish Yew" (''Taxus baccata'' 'Fastigiata'), a fastigiate cultivar of the European Yew, and the several variants with yellow leaves, collectively known as golden yew.
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*''[[Taxus x media]]'' = ''Taxus baccata'' x ''Taxus cuspidata''
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*''[[Taxus x hunnewelliana]]'' = ''Taxus cuspidata'' x ''Taxus canadensis''
  
The Pacific Yew ''Taxus brevifolia'', native to the [[Pacific Northwest]] of [[North America]], and Canada Yew ''Taxus canadensis'' are the sources of [[paclitaxel]], a [[chemotherapy|chemotherapeutic]] drug used in [[breast cancer|breast]] and [[lung cancer]] treatment and, more recently, in the production of the Taxus [[drug eluting stent]] by [[Boston Scientific]]. Over-harvesting of the Pacific Yew for this drug has resulted in it becoming an [[endangered species]], though the drug is now produced semi-synthetically from cultivated yews, without the need to further endanger the wild populations. The more common Canada yew, ''Taxus canadensis'', is also being successfully harvested in northern [[Ontario]], [[Québec]] and [[New Brunswick]], and has become another major source of paclitaxel.  Other yew species contain similar compounds with similar biochemical activity.  [[Docetaxel]], an analogue of paclitaxel, is derived from the ''Taxus baccata''.
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==Gallery==
  
The yew tree can often be found in church graveyards and is symbolic of sadness. Such a representation appears in Lord Alfred Tennyson's poem "In Memoriam A.H.H." (2.61-64).
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<gallery perrow=5>
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Image:Taxus baccata flowers.jpg|Male cones of ''Taxus baccata''
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Image:Upload.png| photo 1
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Image:Upload.png| photo 2
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Image:Upload.png| photo 3
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</gallery>
  
The yew tree is a frequent symbol in the Christian poetry of [[T. S. Eliot]], especially his ''[[Four Quartets]]''.
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==References==
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<references/>
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<!--- xxxxx  *Flora: The Gardener's Bible, by Sean Hogan. Global Book Publishing, 2003. ISBN 0881925381  -->
 +
<!--- xxxxx  *American Horticultural Society: A-Z Encyclopedia of Garden Plants, by Christopher Brickell, Judith D. Zuk. 1996. ISBN 0789419432  -->
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<!--- xxxxx  *Sunset National Garden Book. Sunset Books, Inc., 1997. ISBN 0376038608  -->
  
[[Image:Taxus_baccata_henrykow_poland_01.jpg|right|thumb|oldest polish taxus baccata(1200 years) (detail)]]
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==External links==
 +
*{{wplink}}
  
[[Category:Taxaceae]]
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{{stub}}
 +
__NOTOC__

Latest revision as of 00:01, 20 April 2010


Taxus baccata (European Yew)


Plant Characteristics
Habit   tree

Lifespan: perennial
Cultivation
Scientific Names

Taxaceae >

Taxus >

L. >


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Taxus is a genus of yews, small coniferous trees or shrubs in the yew family Taxaceae. They are relatively slow growing and can be very long-lived, and reach heights of 1-40 m, with trunk diameters of up to 4 m.Template:Fact They have reddish bark, lanceolate, flat, dark-green leaves 1-4 cm long and 2-3 mm broad, arranged spirally on the stem, but with the leaf bases twisted to align the leaves in two flat rows either side of the stem.

The seed cones are highly modified, each cone containing a single seed 4-7 mm long partly surrounded by a modified scale which develops into a soft, bright red berry-like structure called an aril, 8-15 mm long and wide and open at the end. The arils are mature 6-9 months after pollination, and with the seed contained are eaten by thrushes, waxwings and other birds, which disperse the hard seeds undamaged in their droppings; maturation of the arils is spread over 2-3 months, increasing the chances of successful seed dispersal. The male cones are globose, 3-6 mm diameter, and shed their pollen in early spring. Yews are mostly dioecious, but occasional individuals can be variably monoecious, or change sex with time.

All of the yews are very closely related to each other, and some botanists treat them all as subspecies or varieties of just one widespread species; under this treatment, the species name used is Taxus baccata, the first yew described scientifically.

Foliage of Mexican Yew

The most distinct is the Sumatran Yew (T. sumatrana, native to Sumatra and Celebes north to southernmost China), distinguished by its sparse, sickle-shaped yellow-green leaves. The Mexican Yew (T. globosa, native to eastern Mexico south to Honduras) is also relatively distinct with foliage intermediate between Sumatran Yew and the other species. The Florida Yew, Mexican Yew and Pacific Yew are all rare species listed as threatened or endangered.

All species of yew contain highly poisonous alkaloids known as taxanes, with some variation in the exact formula of the alkaloid between the species. All parts of the tree except the arils contain the alkaloid. The arils are edible and sweet, but the seed is dangerously poisonous; unlike birds, the human stomach can break down the seed coat and release the taxanes into the body. This can have fatal results if yew 'berries' are eaten without removing the seeds first. Grazing animals, particularly cattle and horses, are also sometimes found dead near yew trees after eating the leaves, though deer are able to break down the poisons and will eat yew foliage freely. In the wild, deer browsing of yews is often so extensive that wild yew trees are commonly restricted to cliffs and other steep slopes inaccessible to deer. The foliage is also eaten by the larvae of some Lepidopteran insects including Willow Beauty.


Read about Taxus in the Standard Cyclopedia of Horticulture 

Taxus (ancient Latin name of the yew). Taxaceae, formerly named in the Coniferae. Yew. Ornamental woody plants, grown for their dark green foliage and the scarlet berry-like fruits.

Evergreen trees or shrubs: lvs. linear, without resin-ducts, pale or yellowish green beneath, usually 2-ranked: fls. usually dioecious, solitary and axillary, rarely terminal, small, appearing in early spring; staminate globose, composed of 4-8 stamens each, with 3-8 anther-cells attached to the peltate connective; pistillate consisting of a single terminal ovule with several bracts at the base: seed a bony nut surrounded or almost inclosed by a fleshy cup-shaped scarlet disk; cotyledons 2.—Six species are known. They are distributed throughout the northern hemisphere and in Amer. south to Mex. They are all very closely allied and have been considered geographical varieties of a single species. The wood is heavy, hard, close-grained, strong, elastic, and of reddish color. It is highly valued for cabinet-making and turning, and before the invention of gunpowder was in great request in England for the manufacture of bows. The foliage is poisonous to horses and cattle, but the berries are not.

The yews are evergreen, usually small slow-growing trees or shrubs, with 2-ranked linear dark green leaves, insignificant flowers and showy berry-like red fruits. The best-known species is T. baccata, which is hardy as far north as Rhode Island and northwestern New York, and in some forms as far as Massachusetts, while T. cuspidata and T. canadensis are considerably hardier and thrive as far north as Canada; the other species are little known in cultivation. The yews are very desirable evergreens for park planting; they are densely clothed with dark green foliage and the pistillate plants are particularly beautiful in autumn when loaded with scarlet fruits. They are well suited for hedges and easily trimmed into any desired shape. They were formerly much used for fantastic topiary work.

That the typical tree-like, form of the yew is nowadays not much planted is chiefly due to its slow growth, but the numerous mostly shrubby garden forms are popular plants for small gardens. The yews thrive best in a moderately moist sandy loam and endure shade well. Large plants may be successfully transplanted if it is possible to secure a sufficient ball of earth with the roots. Propagation is by seeds, which do not germinate until the second year, and by cuttings taken early in autumn and kept during the winter in a cool greenhouse or frame; the varieties also often by grafting on the type in early spring in the greenhouse, or sometimes by layers. Plants raised from cuttings grow more slowly than grafted ones and cuttings of the type rarely grow into trees but usually into low-spreading shrubs.

T. floridana, Chapm. Bushy tree, 25 ft. high or sometimes shrubby: lvs. slender, 3/4 - 1 in. long, dark green. Fla.—T. koraiensis, Hort.-Cephalotaxus Harringtonia var. fastigiata. —T. Wallichiana, Zucc. Tree, to 100ft.: lvs. gradually long-acuminate, 1-1 1/2 in. long. Himalayas, Malay Archipelago, Philippine Isls. Apparently not in cult.


The above text is from the Standard Cyclopedia of Horticulture. It may be out of date, but still contains valuable and interesting information which can be incorporated into the remainder of the article. Click on "Collapse" in the header to hide this text.


Cultivation

Propagation

Pests and diseases

Species

Taxus baccata - European Yew
Taxus brevifolia - Pacific Yew, Western Yew
Taxus canadensis - Canadian Yew
Taxus chinensis (syn. Taxus wallichiana var. chinensis) - Chinese Yew
Taxus cuspidata - Japanese Yew
Taxus floridana - Florida Yew
Taxus globosa - Mexican Yew
Taxus sumatrana - Sumatran Yew
Taxus wallichiana - Himalayan Yew

Hybrids:

Gallery

References


External links