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(Last Modified On 6/6/2013)
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(Last Modified On 6/6/2013)
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Species
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Stevia triflora DC.
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PlaceOfPublication
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Prodr. 5: 115. 1836.
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Note
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TYPE: Mexico, San Felipe, Oaxaca, Karwinski (G-DC, not seen, US, microfiche; M, not seen, US, photo).
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Synonym
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Stevia compacta Benth., P1. Hartw. 197. 1845. TYPE: Colombia, near Rio Negro between villages of Fusagasuga' and Pandi, Hartweg 1091 (K, holotype, not seen). Stevia rhombifolia var. stephanocoma Schultz-Bip., Linnaea 25: 279. 1853. TYPE: Venezuela, Merida, "Colombia," Moritz 1375 (P, holotype, not seen).
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Description
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Sparingly branched rhizomatous perennial herbs; stems mostly brownish, never purple, terete, slightly striate, densely puberulous. Leaves opposite; blades ovate to narrowly ovate, 4-8 cm long and 2-5 cm wide, the base cuneate and decurrent onto petiole, the margins slightly to closely serrate or serrulate, the apex acute, the surfaces glandular punctate, the upper surface puberulous, the lower surface puberulous to tomentose on veins and areoles, the veins distinctly trinervate from near base; petioles usually 0.5 cm long, winged and sometimes distally indistinct from lamina. Inflorescence flat-topped, densely corymbose, the primary branches opposite, usually spreading at less than 450, branches densely puberulous to subtomentose, the ultimate branches 0-2 mm long. Heads ca. 6-7 mm high; involucral bracts narrowly oblong-lanceolate, 4.5-5.5 mm long and 0.7 mm wide, slightly striate, minutely glandular-punctate, scarcely scarious on margins; corolla white, ca. 4.5 mm long, glandular punctate with few short hairs on tubes and lobes, the lobes equal, ca. 1.2 mm long. Achenes 2.5-3.0 mm long, sparsely hispid; pappus a fimbrillate to subentire crown of united scales ca. 0.3 mm long, without awns.
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Habit
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herbs
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Distribution
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distributed from central Mexico southward through Central America to the Andes in Ecuador.
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Note
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The species seems close to the common S. ovata and is placed in synonymy by some authors. Some specimens, especially from Chiapas southward, are difficult to distinguish. The pubescence of the lower leaf surface and the complete lack of pappus awns seem the most useful characters. Plants thusly distinguished show a more sharply acute and less scarious tip on the involucral bracts than is seen in most specimens of S. ovata.
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Specimen
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CHIRIQUI: Cerro Vaca, 900-1136 m, Pittier 5297 (US). Valley of the upper Rio Chiriqui Viejo, White & White 106 (MO). PANAMA: Beyond Goofy Lake along road to Cerro Jefe, Correa & Dressler 451 (MO).
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