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(Last Modified On 6/3/2013)
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(Last Modified On 6/3/2013)
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Genus
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Pseudelephantopus Rohr
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PlaceOfPublication
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Skr. Naturhist.-Selsk. 2: 213. 1792.
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Note
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TYPE: Elephantopus spicatus Juss.
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Synonym
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Distreptus Cass., Bull. Soc. Philom. 1817: 66. 1817. TYPE: Elephantopus spicatus Juss. Spirochaeta Turcz., Bull. Soc. Imp. Naturalistes Moscou 24: 166. 1851. TYPE: S. funckii Turcz. Chaetospira Blake, Jour. Wash. Acad. Sci. 25: 311. 1935. TYPE: Spirochaeta funckii Turcz.
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Description
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Erect, perennial herbs; stems solitary, branched. Leaves cauline, alternate, pinnately veined; petioles indistinct. Inflorescences several, terminal, racemose- spicate, the heads clustered in the axils of leaflike bracts, the clusters 1-several- headed, obconic. Heads with 4 florets; involucral bracts 8, similar, in 4 decussate pairs, abaxially bicolored; receptacle naked, convex, bearing minute protuberances at the base of the achenes, florets bisexual, zygomorphic; corolla tubular-funnel- form, the tube slender, the limb 5-cleft, deeply divided on the adaxial side; anthers 2-celled, sagittate at the base, apically appendaged; style bifid, the branches slender, flattened and stigmatic adaxially, strigulose abaxially. Achenes ? obovoid, slightly flattened, 10-ribbed, hispidulous or strigulose primarily on the ribs; pappus in 1 series of 5-10 unequal or subequal bristles, doubly bent or spiralled toward the apex, glabrous on the surfaces, ciliolate.
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Habit
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herbs
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Distribution
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Panama
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Native
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Panama
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Note
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Cronquist (1971) gives reasons supporting the spelling Pseudelephantopus. Pseudelephantopus is conspicuously different from all members of Elephan- topus in the general construction and appearance of the inflorescence. The heads of Pseudelephantopus are not densely held in a tight glomerule, and the sub- tending bracts are not highly specialized as in Elephantopus, but are leaf- like. Furthermore, Pseudelephantopus differs cytologically. Pseudelephantopus spicatus has been reported (Cronquist, 1971) to have 2n =28, in contrast to Elephantopus, which has 2n = 22, 44 (Federov, 1969).
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Reference
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Cronquist, A. 1971. Compositae. Pp. 350-353 in I. L. Wiggins & D. M. Porter, Flora of the Galapagos. Stanford Univ. Press, Stanford, California.
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Key
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a. Principal pappus bristles conspicuously doubly bent; achenes more than 5 mm long ...... 1. P. spicatus aa. Pappus bristles curled or loosely spiralled; achenes less than 5 mm long ...... 2. P. spiralis
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