Difference between revisions of "Torreya"

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'''''Torreya''''' is a genus of [[Pinophyta|conifers]] comprising five or six species, treated in either the [[Cephalotaxaceae]], or in the [[Taxaceae]] when that family is considered in a broad sense. Four are native to eastern [[Asia]], the other two native to [[North America]]. They are small to medium sized [[evergreen]] [[tree]]s reaching 5-20 m, rarely 25 m, tall. Common names include '''Nutmeg yew'''.<ref>Eckenwalder, J.E. 2009. ''Conifers of the World: The Complete Reference''. Timber Press.</ref>
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The [[leaf|leaves]] are spirally arranged on the shoots, but twisted at the base to lie in two flat ranks; they are linear, 2-8 cm long and 3-4 mm broad, hard in texture, with a sharp spine tip.
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''Torreya'' can be either [[plant sexuality|monoecious]] or [[plant sexuality|dioecious]]; when monoecious, the male and female [[conifer cone|cones]] are often on different branches. The male ([[pollen]]) cones are 5-8 mm long, grouped in lines along the underside of a shoot. The female ([[seed]]) cones are single or grouped 2-8 together on a short stem; minute at first, they mature in about 18 months to a [[drupe]]-like structure with the single large [[nut (fruit)|nut]]-like seed 2-4 cm long surrounded by a fleshy covering, green to purple at full maturity. In some species, notably the [[Japan]]ese ''[[Torreya nucifera]]'' ('''Kaya'''), the seed is edible. Natural dispersal is thought to be aided by [[squirrel]]s which bury the seeds for a winter food source; any seeds left uneaten are then able to germinate.
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The genus is named after the American botanist [[John Torrey]].
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''[[Torreya californica]]'' ('''California Torreya''') is [[endemic (ecology)|endemic]] in [[California]]. It is the largest species, reaching 25 m tall.
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Torreya (named for Dr. John Torrey, one of the most distinguished of the earlier American botanists; 1796-1873). Syns., Tumion, Caryotaxus. Taxaceae. Ornamental evergreens, grown for their handsome foliage and interesting habit.
 
Torreya (named for Dr. John Torrey, one of the most distinguished of the earlier American botanists; 1796-1873). Syns., Tumion, Caryotaxus. Taxaceae. Ornamental evergreens, grown for their handsome foliage and interesting habit.
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Latest revision as of 18:00, 28 April 2010


Torreya nucifera


Plant Characteristics
Cultivation
Scientific Names

Taxaceae >

Torreya >


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!


Torreya is a genus of conifers comprising five or six species, treated in either the Cephalotaxaceae, or in the Taxaceae when that family is considered in a broad sense. Four are native to eastern Asia, the other two native to North America. They are small to medium sized evergreen trees reaching 5-20 m, rarely 25 m, tall. Common names include Nutmeg yew.[1]

The leaves are spirally arranged on the shoots, but twisted at the base to lie in two flat ranks; they are linear, 2-8 cm long and 3-4 mm broad, hard in texture, with a sharp spine tip.

Torreya can be either monoecious or dioecious; when monoecious, the male and female cones are often on different branches. The male (pollen) cones are 5-8 mm long, grouped in lines along the underside of a shoot. The female (seed) cones are single or grouped 2-8 together on a short stem; minute at first, they mature in about 18 months to a drupe-like structure with the single large nut-like seed 2-4 cm long surrounded by a fleshy covering, green to purple at full maturity. In some species, notably the Japanese Torreya nucifera (Kaya), the seed is edible. Natural dispersal is thought to be aided by squirrels which bury the seeds for a winter food source; any seeds left uneaten are then able to germinate.

The genus is named after the American botanist John Torrey.

Torreya californica (California Torreya) is endemic in California. It is the largest species, reaching 25 m tall.


Read about Torreya in the Standard Cyclopedia of Horticulture 

Torreya (named for Dr. John Torrey, one of the most distinguished of the earlier American botanists; 1796-1873). Syns., Tumion, Caryotaxus. Taxaceae. Ornamental evergreens, grown for their handsome foliage and interesting habit.

Strong broad trees: lvs. 2-ranked, linear or linear-lanceolate, with 2 narrow glaucous lines beneath, becoming fulvous with age; when bruised the foliage emits a pungent or fetid odor except, in T. grandis: fls. dioecious, rarely monoecious; staminate fls. ovoid or oblong, composed of 6-8 whorls of stamens, surrounded at the base by bud-scales; pistillate fls. consisting of a solitary ovule surrounded at the base by a fleshy aril and several scales: fr. drupe-like, consisting of a rather large seed, with thick woody shell entirely covered by a thin fleshy aril.—Four species in N. Amer. and E. Asia. The hard, strong, and close-grained wood is much valued in Japan for cabinet-making and building. It is very durable in the ground. In this country it has been used for fence-posts.

The torreyas are handsome evergreen trees, with spreading usually whorled branches, clothed with yew-like two-ranked dark green foliage; the fruits are drupe-like and about 1 inch long. They are but little known in cultivation and rarely seen in a flourishing condition. The Japanese T. nucifera is the hardiest and has proved fairly hardy as far north as Massachusetts; also T. grandis survives in very sheltered positions in the vicinity of Boston, but the other two species are much tenderer. Torreyas grow best in shaded and sheltered positions and in a somewhat moist loamy soil. Propagation is by seeds; also by cuttings and by grafting on Cephalotaxus. Plants raised from cuttings grow very slowly and usually remain bushy. For cions, terminal shoots should be selected. CH


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

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Propagation

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Pests and diseases

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Species

Torreya californica
Torreya fargesii
Torreya grandis
Torreya jackii
Torreya nucifera
Torreya taxifolia

Gallery

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References

External links


  1. ↑ Eckenwalder, J.E. 2009. Conifers of the World: The Complete Reference. Timber Press.
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