Pavonia vannii Fryxell
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Authority
Fryxell, Paul A. 1999.
Cavanilles (Malvaceae). Fl. Neotrop. Monogr. 76: 1-284. (Published by NYBG Press) -
Family
Malvaceae
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Scientific Name
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Type
Type. Paraguay. Boquerón: Col. Menno, Loma Plata, enclosure of the Loma Plata Reserve, Vanni, Radovancich & Schinini 1948 (holotype, CTES).
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Description
Latin Diagnosis - Suffrutices decumbentes vel ascendentes caulibus dense pubescentibus et pilosis; laminis foliorum ovatis vel suborbicularis molliter et perdense pubescentibus; floribus solitariis; bracteis involucellorum 8-9 quam calyce longioribus; corollis 15-18 mm longis flavidis cum vel sine centro rubro; fructibus oblatis ca. 8 mm diametro minute scabridulosis.
Species Description - Decumbent or ascending subshrubs, often supported on other vegetation, the stems densely stellate-pubescent (hairs 0.5 mm long or less) and pilose with simple hairs 1.5-2 mm long. Leaf blades ovate to suborbicular, 3-4 x 2.5-3.5 cm, basally more or less cordate, serrate, acute, palmately 5-7-nerved, very densely and softly tomentose on both surfaces; petioles 1-3.5 cm long, half length of blade to subequal to blade, with pubescence like stem but more densely pilose distally; stipules filiform, 3-4 mm long, caducous. Flowers solitary in the leaf axils, the pedicels 3-6.5 cm long, minutely stellate-pubescent and pilose, more densely so distally; involucellar bracts 8-9, lanceolate, 9-15 x 2-3 mm, densely stellate-tomentose, sometimes also pilose; calyx 6-7 mm long, stellate-pubescent, ca. halfdivided, the lobes 3-ribbed; petals 15-18 mm long, yellow with or without a red center, externally with simple and 3-armed stellate hairs, internally glabrous, pubescent on margins of claw; staminal column ca. 8 mm long, glabrous, the filaments 1-1.5 mm long; styles emergent from the column, with capitate, villous stigmas. Fruits ca. 8 mm diam., oblate, minutely scabridulous; mericarps ca. 5 mm high.
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Discussion
The Bolivian specimens cited have more densely pilose involucels than the Paraguayan specimens, but they otherwise appear to be the same and are here treated as conspecific. The specific epithet is chosen to honor the collector of the type, Ricardo Oscar Vanni (b. 1954) of Corrientes, Argentina.
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Distribution
Paraguay and Bolivia, at low elevation. The type locality is at 22°21'S, 59°50'W.
Bolivia South America| Santa Cruz Bolivia South America| Paraguay South America| Boquerón Paraguay South America| Chaco Paraguay South America| Cordillera Paraguay South America|