EcoFlora - Silphium asteriscus var. trifoliatum

Silphium asteriscus var. trifoliatum (L.) J. A. Clevinger (redirected from: Silphium trifoliatum var. trifoliatum L.)
Family: Asteraceae Starry Rosinweed [Silphium asteriscus subsp. trifoliatum (L.) Weber & Fisher, more]	FNA Gleason & Cronquist Gleason & Cronquist Indiana Flora Resources Jennifer A. Clevinger in Flora of North America (vol. 21) Plants 75-140 cm. Leaves: basal persistent; cauline mostly whorled (in 3s); faces glabrous or sparsely hairy. Paleae puberulent. Ray florets 11-16. Disc florets 35-90. 2n = 14. Flowering mid summer-early fall. Prairies, meadows, roadsides, along railways; 100-900 m; Ala., Ga., Ill., Ind., Ky., Md., N.Y., N.C., Ohio, Pa., S.C., Tenn., Va., W.Va. Vascular plants of NE US and adjacent Canada Fibrous-rooted from a short rhizome or caudex; stem robust, (0.7-) 1-2 m, glabrous, often glaucous; lvs variously whorled or opposite or seldom alternate, entire or merely toothed, petiolate or tapering to a subpetiolar base; heads several to commonly ±numerous in an open infl, rather small, with ca 8 or ca 13 rays 1.5-3 cm, the disk ca 1-1.5(-2) cm wide; invol bracts glabrous except the ciliate margins; 2n=14. Open woods, prairies, and disturbed open places; se. Pa. to O. and Ind., s. to N.C., Ga., and Miss. Two vars. Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp. ©The New York Botanical Garden. All rights reserved. Used by permission. Vascular plants of NE US and adjacent Canada Lvs mostly ternate or quaternate, occasionally opposite, seldom partly alternate, scabrous above, hirsute at least on the midrib beneath, the blade lanceolate or lance-elliptic to rather narrowly lance-ovate, (2.5-)3-5 times as long as wide, 7-20 נ1.5-5 cm, tapering to a hirsute-ciliate petiole to 1.5 cm, or to a shortly subpetiolar base; n. var., from se. Pa. to O. and Ind., s. to Va. and in the mt. region to Ga. Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp. ©The New York Botanical Garden. All rights reserved. Used by permission. From Flora of Indiana (1940) by Charles C. Deam Infrequent to rare in dry soil on open, wooded slopes in two widely separated parts of the state. Beyond the area shown on the map, it has been reported from Carroll, Cass, Knox, and La Porte Counties. This species, like the next, is variable and in certain forms it is separated from it with difficulty. In the typical form, the leaves are lanceolate, dark green, some whorled, and generally with nearly entire margins. Non-typical plants may have only opposite leaves or some alternate ones, and narrow-ovate blades. The inner face of the achenes is glabrous or pubescent, usually the latter. …… Indiana Coefficient of Conservatism: C = 8 Wetland Indicator Status: N/A
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