Silphium laciniatum
Silphium laciniatum subsp. var. | Compass plant | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
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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.
Standard Cyclopedia of Horticulture |
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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. CH
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External links
- w:Silphium laciniatum. Some of the material on this page may be from Wikipedia, under the Creative Commons license.
- Silphium laciniatum QR Code (Size 50, 100, 200, 500)