(Last Modified On 5/30/2013)
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(Last Modified On 5/30/2013)
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Species
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Matelea pinguifolia (Standl.) Woodson
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PlaceOfPublication
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Ann. Missouri Bot. Gard. 28: 235. 1941.
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Synonym
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Vincetoxicum pinguifolium Standl., Jour. Washington Acad. Sci. 17: 13. 1927. TYPE: Panama, Standley 40946 (US).
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Description
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Herbaceous or subligneous vines; stems pubescent, the hairs of 2 types, short bulbous ones overtopped by brown, multicellular, stiff ones to 3 mm in length which decrease in density with age. Leaves broadly ovate-cordate, acuminate, glabrate to densely puberulent beneath, puberulent above, 6-10 cm long and 3-7 cm wide; petioles slender, 2-6 cm long. Inflorescences racemiform, 10-20- flowered, minutely brown puberulent; peduncles 1-1.5 cm, occasionally to 3 cm long; pedicels mostly 2-3 cm long. Flowers with the calyx lobes lanceolate-ovate to ovate, glabrous inside, brownish puberulent outside, 2-4 mm long and 1.5-2.5 mm wide; corolla brownish to orange, the lobes strongly reflexed at maturity, ovate to elliptic, puberulent outside, inner (adaxial) surface with long whitish hairs along the margin and near the apex, occasionally scattered over the entire surface, 4-6 mm long and 2-3 mm wide; corona fleshy, annular, the surface cor- rugated, purplish-black, 1.5-2 mm high; gynostegium slightly exceeding the corona in height; stigma head round or obscurely 5-angled. Follicles narrowly ovoid with a slender acuminate apex, 10-12 cm long, ca. 2 cm in diameter, tu- berculate, pubescent, the tubercles long and slender, to 1.5 cm long, the pubes- cence of brownish, multicellular hairs up to 6 mm long.
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Habit
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vines
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Note
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The peculiarly colored flowers with their conspicuous corona and distinctive follicles make this one of the most easily identified milkweeds in Panama.
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Distribution
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It is known only from Colombia, Panama, and Costa Rica.
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Note
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While the Colombian collection agrees with the Panamanian material, a single collection (Brenes 1450) from near San Ramon, Costa Rica, is noticeably different in its overall dense pubescence, particularly the presence of long brown hairs on the inflorescence and calyx. Material from Chiriqui (Tyson 5860) is somewhat intermediate be- tween typical material and the Costa Rican collection.
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Specimen
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CANAL ZONE: Madden Dam, Dwyer 2185 (MO). Barro Colorado Island, Shattulck 612 (F, MO), 727 (MO); Standley 40871, 40946, 41116 (all US). CHIRIQUI: Opening to canyon to Bambito, 5000 ft, Tyson 5860 (DUKE, FSU, MO). PANAMA: Near Pacora, Allen 2036 (F, MO, US). Forest from first sharp bend on Rio Pasiga, 0-2.5 mi. along lumber road to Rio Maestro, Gentry 2347 (MO).
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