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(Last Modified On 6/3/2013)
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(Last Modified On 6/3/2013)
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Species
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Elephantopus dilatatus Gleason
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PlaceOfPublication
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Bull. New York Bot. Gard. 4: 240. 1906.
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Note
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TYPE: Costa Rica, Buenos Aires, bords du Rio Ceibo, Pittier 3733 (US, isotype).
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Description
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Perennial herbs mostly to 40 cm tall; stems creeping at the base, rooting at the nodes, enclosed in an overlapping series of persistent leaf sheaths, the sheaths pilose. Leaves clustered, terminal, oblanceolate-oblong, basally long-attenuate, apically acute, serrate, 7-18 cm long, 0.6-2.2 cm wide, at least 7 times longer than wide, coriaceous, green throughout, darker above, strigulose to appressed- pubescent beneath, the trichomes 0.2-1.3 mm long on both surfaces, resin-dotted beneath, the midrib prominent on both surfaces but the primary lateral veins obscure above; petioles pilose, indistinct from the lamina, expanded, clasping. Inflorescence solitary, terminal, corymbose-paniculate, the branches subtended by oblong leaflike bracts to 6 cm long, peduncles appressed-pubescent; glomerules several to many, 10-15-headed, hemispheric, to 8 mm high and 15 mm across, subtended by 2 or 3 ovate bracts; bracts obtuse at base, acute to acuminate, 5-8 mm long, the venation usually apparent but not conspicuous beneath. Heads with 4 florets; involucral bracts 8, in 2 decussate series, strigulose, resin-dotted, the outer 4 lanceolate, 3.0-4.5 mm long, the inner 4 lanceolate-oblong, 5.0-8.0 mm long; corolla lavender, the tube slender, ca. 3.5 mm long, the limb ca. 2.0 mm long, deeply divided on the adaxial side, 5-parted, the lobes linear, ca. 1.4 mm long; anthers ca. 1.2 mm long, basally sagittate, the lobes slightly convex, ca. 0.14 mm long, the apex forming a 250 angle, the apical appendage rounded, ca. 0.18 mm long; style branches slender, terete, slightly flattened adaxially, 0.5-1.0 mm long, strigulose throughout. Achenes obovoid, slightly flattened, 10-ribbed, 2.2-3.0 mm long, 0.6-0.8 mm wide, dark-brown in the sulci when mature, pale on the ribs, strigulose and resin-dotted abaxially; pappus in 1 series of 5(-8) straight bristles, 3.0-3.5 mm long, abruptly or gradually dilated to 0.3 mm wide at the base, appressed-puberulent.
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Habit
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herbs
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Note
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Elephantopus dilatatus is similar to the Brazilian E. riparius Gardn. which differs chiefly in having much shorter bracts (less than 4 mm long.) subtending the glomerules.
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Distribution
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known from Costa Rica, Panama, and the Choco of Colombia (Duke 9971, OS).
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Note
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It occurs chiefly in riverine habitats and has been collected in Panama only in December and January.
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Specimen
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CANAL ZONE: Quebrada La Palma and Cafion of Rio Chagres, 70-80 m, Dodge & Allen 17383 (MO, NY). COL6N: Ca. 2-3 mi up the Rio Guanche, ca. 10-20 m, Kennedy & Foster 2140 (MO, PMA, US). PANAMA: Between Cerro Azul and Cerro Jefe, Dressler 3269 (DUKE, FSU, MO).
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