Difference between revisions of "Silphium laciniatum"

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'''''Silphium laciniatum''''' ('''Compass Flower''', '''Compass Plant''' or '''Rosinweed''') is a species of [[flowering plant]] in the genus ''[[rosinweed|Silphium]]''. It is native to east-central [[North America]].
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It is a [[perennial plant|perennial]] [[herbaceous]] plant similar in appearance to a [[sunflower]], growing to 1-4 m tall, with bristly-hairy stems. The [[leaf|leaves]] are alternately arranged, and deeply pinnately lobed; the basal leaves up to 40&nbsp;cm long, becoming smaller higher up the stem. The [[flower]]s are produced in [[inflorescence|flowerheads]] (capitula) 5-12&nbsp;cm diameter, with a ring of ray florets surrounding the 2-3&nbsp;cm diameter center of disc [[Flower|floret]]s. Flowering is in late summer, typically from July to September.
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Compass plants are so named because they tend to align their foliage '''East-West''' to present the minimum surface area to the hot noon sunshine. The taproot of the compass plant may grow to more than 9-14 ft. deep, making it hardy and resistant to drought.
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Silphium laciniatum, Linn. Compass Plant. St. about 6 ft. high, leafy at the base, much less so above, very rough: lvs. 1 ft. long or more, once or twice pinnately parted, the lobes oblong or lanceolate: fl.-heads several, sessile or short-peduncled, 2-5 in. across; rays 20-30. July-Sept. Ohio, west and south.— It is said of this species that the st.-lvs. tend to point north and south.
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Silphium laciniatum, Linn. Compass Plant. St. about 6 ft. high, leafy at the base, much less so above, very rough: lvs. 1 ft. long or more, once or twice pinnately parted, the lobes oblong or lanceolate: fl.-heads several, sessile or short-peduncled, 2-5 in. across; rays 20-30. July-Sept. Ohio, west and south. B.B. (ed. 2) 3:461.— It is said of this species that the st.-lvs. tend to point north and south.
 
 
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==Cultivation==
 
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==Species==
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==Varieties==
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==References==
 
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*[[Standard Cyclopedia of Horticulture]], by L. H. Bailey, MacMillan Co., 1963
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<!--- xxxxx  *Flora: The Gardener's Bible, by Sean Hogan. Global Book Publishing, 2003. ISBN 0881925381  -->
 
<!--- 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  -->
 
<!--- xxxxx  *American Horticultural Society: A-Z Encyclopedia of Garden Plants, by Christopher Brickell, Judith D. Zuk. 1996. ISBN 0789419432  -->
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Latest revision as of 15:20, 30 May 2010


Compass plant.jpg


Plant Characteristics
Habit   herbaceous

Height: ⇕ 5 ft"ft" can not be assigned to a declared number type with value 5. to 10 ft"ft" can not be assigned to a declared number type with value 10.
Width: ⇔ 3 ft"ft" can not be assigned to a declared number type with value 3. to 4 ft"ft" can not be assigned to a declared number type with value 4.
Lifespan: ⌛ perennial
Bloom: ❀ early summer, mid summer, late summer
Cultivation
Exposure: ☼ sun, part-sun
Features: ✓ flowers, drought tolerant
USDA Zones: 4 to 9
Flower features: ❀ orange, yellow
Scientific Names

Asteraceae >

Silphium >

laciniatum >


Silphium laciniatum (Compass Flower, Compass Plant or Rosinweed) is a species of flowering plant in the genus Silphium. It is native to east-central North America.

It is a perennial herbaceous plant similar in appearance to a sunflower, growing to 1-4 m tall, with bristly-hairy stems. The leaves are alternately arranged, and deeply pinnately lobed; the basal leaves up to 40 cm long, becoming smaller higher up the stem. The flowers are produced in flowerheads (capitula) 5-12 cm diameter, with a ring of ray florets surrounding the 2-3 cm diameter center of disc florets. Flowering is in late summer, typically from July to September.

Compass plants are so named because they tend to align their foliage East-West to present the minimum surface area to the hot noon sunshine. The taproot of the compass plant may grow to more than 9-14 ft. deep, making it hardy and resistant to drought.


Read about Silphium laciniatum in the Standard Cyclopedia of Horticulture 

Silphium laciniatum, Linn. Compass Plant. St. about 6 ft. high, leafy at the base, much less so above, very rough: lvs. 1 ft. long or more, once or twice pinnately parted, the lobes oblong or lanceolate: fl.-heads several, sessile or short-peduncled, 2-5 in. across; rays 20-30. July-Sept. Ohio, west and south.— It is said of this species that the st.-lvs. tend to point north and south. 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

Propagation

Pests and diseases

Varieties

Gallery

  • photo 1

  • photo 2

  • photo 3

References


External links


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