Six New Species of Adenocalymna (Bignoniaceae) from Eastern South America

Abstract

Six new species of Adenocalymna are described from Brazil and French Guiana. Adenocalymna is one of the genera of Bignoniaceae tribe Bignonieae that is most prone to local endemism (Sutherland, 1983). Six new species of the genus are included in recent collections from eastern South America. Adenocalymna dichilum A. Gentry, sp. nov. TYPE: Brazil. Piauhy: Bom Jesus-Sao Raimundo Nonato, caatinga, 11 May 1979 (fl), A. Fernandes s.n. (EAC 6185), (holotype, EAC; isotype, MO). Frutex scandens, ramulis teretibus. Folia 2(-3?)-foliolata, interdum cirrho simplici, foliolis ovatis vel ellipticis, infra valde villosis. Inflorescentia floribus in racemo terminali dispositis. Calyx cupulatus, 5-dentatus, 12-14 mm longus; corolla lutea, valde bilabiata, extus puberula. Capsula ignota. Liana; branchlets terete, longitudinally striate, with scattered small inconspicuous lenticels, finely puberulous with small suberect whitish trichomes; pseudostipules ovate, 3-4 mm long; interpetiolar glandular fields absent. Leaves 2(-3?)-foliolate, the terminal leaflet sometimes replaced by a simple tendril, the leaflets ovate to elliptic, obtuse to emarginate at apex, rounded to distinctly cordate at base, 2-4 cm long, 1.5-3.5 cm wide, above + glabrescently puberulous with short erect trichomes, below persistently villous, coriaceous, drying brownish above, olive below, the tertiary venation prominulous below, finer venation obscured by the indumentum; petiole 1.5-2.5 cm long, petiolules 0.2-0.9 cm long, rather densely tomentose with multicelled trichomes. Inflorescence a terminal raceme, densely tannish tomentose, with pair of caducous obovate coriaceous bracts ca. 1.5 cm long subtending each node, each bract with several large plate-shaped glands, the pedicels 1-1.5 cm long, with pair of ca. 1-cm-long elliptic bracteoles near apex subtending calyx. Flowers with the calyx cupular, shallowly 5-dentate, 1214 mm long, 9-10 mm wide, tannish puberulous, with conspicuous plate-shaped glands near margin; corolla yellow, ? tubular, strongly bilabiately split almost to middle, ca. 3.5 cm long, ca. 1 cm wide at mouth of tube, the tube ca. 1.8 cm to base of split, the lower lobes narrow, ca. 1 cm long, the upper two lobes with free part ca. 3 mm long but basally fused to form 1.5-cm-long upper lip, densely puberulous outside except for base of tube; stamens subexserted, the thecae subparallel, pendulous, ca. 6 mm long; pistil and disk not examined. Fruit not