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Silphium laciniatum (view source)

Revision as of 15:20, 30 May 2010

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{{SPlantbox
 
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|familia=Asteraceae
 
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|genus=Silphium  
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|genus=Silphium
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|species=laciniatum  
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|species=laciniatum
 
|common_name=Compass plant
 
|common_name=Compass plant
 
|name_ref=Flora - A Gardener's Encyclopedia
 
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|features=flowers, drought tolerant
 
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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==
 
==References==
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*[[Standard Cyclopedia of Horticulture]], by L. H. Bailey, MacMillan Co., 1963
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<references/>
 
<!--- 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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