Monographs Details: Pavonia vannii Fryxell
Authority: Fryxell, Paul A. 1999. Cavanilles (Malvaceae). Fl. Neotrop. Monogr. 76: 1-284. (Published by NYBG Press)
Family:Malvaceae
Scientific Name:Pavonia vannii Fryxell
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.

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.
Distribution:Bolivia South America| Santa Cruz Bolivia South America| Paraguay South America| BoquerĂ³n Paraguay South America| Chaco Paraguay South America| Cordillera Paraguay South America|