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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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Vernonia triflosculosa H.B.K.
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PlaceOfPublication
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Nov. Gen. Sp. P1. 4: 40. 1820.
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Note
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TYPE: Mexico, not seen.
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Synonym
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Vernonia triantha Schauer in Nees & Schauer, Linnaea 19: 714. 1847. Cacalia triflosculosa (H.B.K.) Kuntze, Rev. Gen. P1. 2: 971. 1891. Vernonia luxensis Coult., Bot. Gaz. (Crawfordsville) 20: 41. 1895. Vernonia dumeta Klatt, Bull. Soc. Roy. Bot. Belgique 35: 277. 1896. Eremosis triflosculosa (H.B.K.) Gleason, Bull. New York Bot. Gard. 4: 233. 1906.
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Description
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Shrubs or small trees to 8 m high, lignescent, freely branched to form a rounded crown; branches erect to slightly spreading, striate, sparsely pubescent, cinereous, glabrescent. Leaves short-petiolate; petiole 0.8-1.5 cm long, canaliculate above; blades narrowly elliptic to broadly oblanceolate, acute to short-acuminate at the apex, acute to attenuate at the base, 5-12 cm long, 1-3 cm broad, marginally entire to minutely denticulate, plane and glabrous above, glabrate beneath, lateral veins ascending, 4-8 pairs, prominent beneath. Inflorescences terminal, forming a large hemispheric compound corymb. Heads with 3-4 florets, sessile to subsessile; involucre cylindric to narrowly campanulate, 2.5-6 mm long, 4-6-seriate, the outer involucral bracts subrotund, obtuse or apiculate at the apex, scarious, the inner involucral bracts oblong to ovate, acute to acuminate at the apex, scarious; receptacle subconvex, alveolate, naked; corolla narrowly cylindric, 5-6 mm long, 5-lobed, the lobes subulate, 1-1.5 mm long; stamens 5, the anthers 2-2.5 mm long, apically acute, basally obtusely sagittate; styles 5-6 mm long, the branches 1-2 mm long, apically acute, antrorsely puberulous. Achenes narrowly turbinate,
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Habit
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Shrubs or small trees
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Description
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8-10-ribbed, antrorsely puberulent, 2.5-3 mm long; pappus weakly biseriate, white, the inner bristles capillary, 4.5-6 mm long, the outer bristles subulate to capillary, less than 1 mm long, persistent.
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Note
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The only species of Vernonia in Panama with only three or four florets per head, Vernonia triflosculosa is known from a single collection in western Panama. The Panamanian specimen belongs to subspecies triflosculosa which extends from Panama throughout Central America to southern Mexico. Subspecies palmeri (Rose) Jones is restricted to western Mexico and is characterized by narrowly lanceolate leaves as opposed to broadly lanceolate to oblanceolate leaves of sub- species triflosculosa. Until recently, this species has been placed in the genus Eremosis.
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Specimen
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CHIRIQUI: Boquete, Davidson 642 (F, MO, US).
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