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Project Name Data (Last Modified On 6/17/2013)

Flora Data (Last Modified On 6/17/2013)
Genus Sclerocarpus Jacq.
PlaceOfPublication Ic. P1. Rar. 1: 17, tab. 176. 1781.
Note TYPE: S. africanus Jacq.
Description Mostly erect, annual herbs, rarely perennial or shrubs; stems slender, pubes- cent. Leaves alternate, sometimes opposite below, ovate, elliptical or filiform- dissected, the margins mostly serrate, 3-veined from near the base, pubescent, sometimes scabrous above; petioles slender, sometimes short or wanting. Inflores- cence mostly a solitary head; peduncles elongate or almost wanting, sometimes stout, pubescent. He-ads radiate; involucral bracts 4 or more, foliaceous, sometimes
Habit herbs
Description apparently petiolate, eglandular, pubescent on both sides, rarely rudimentary; paleas tubular, the edges overlapped and fused below, the apex dentate or lobed, mostly pubescent, indurate, expanding and sclerifying in fruit; receptacle conical; ray florets 3-10, fertile, corolla yellow, the pubescent tube forming much of the length, the limb elliptical with a conspicuously notched apex, ovary as long as the corolla tube, flattened, sterile; disc florets several to many, the corolla with elongate, slender, strigose apical lobes, the tube little differentiated, the stamens dark, exserted or not, the appendages narrow, long, dark, eglandular, the basal auricles small or indistinct, the style branches cylindrical, pilose, the style base expanded-globose, stipitate, the ovary turbinate, the pappus a ring of hairs or squamellae, or wanting, the carpopodium conspicuous. Fruit a utricle, the scierified palea sometimes strongly oblique, often with a slender beak, fused to the achene apex.
Distribution A genus of about 8 species of warm temperate and tropical America, and one species (the type) of dry regions of Africa.
Note Sclerocarpus may be recognized in flower by the elongate, strigose lobes of the disc florets and the elongate anther appendages, and in fruit by the distinctive oblique, urn-shaped utricles. Bentham (1872) considered Aldama LaLlave & Lexarza to be synonymous. Although closely related, that genus is distinguished in having three distinctive types of floret per head. Feddema in his herbarium annotations recognized Aldama as distinct.
Reference Feddema, C. 1972. Scierocarpus uniserialis (Compositae) in Texas and Mexico. Phytologia 23: 201-209.
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