A New Species of Citharexylum (Verbenaceae) from Ecuador

Abstract

A new species of Citharexylum from Ecuador (C. grandiflorum) is described, and its relationships with related species are discussed. This new species can be distinguished from all others in the genus by its significantly larger corolla. RESUMEN. Se describe una nueva especie del gn Nash & Nee, 1984; Jansen-Jacobs, 1988, Aymard & Stergios, 1991; Nicolson, 1991). Citharexylum grandiflorum Aymard & Rueda, sp. nov. TYPE: Ecuador. Napo: Jatun Sacha Biological Station, primary tropical wet forest, on low hills, 01?04'S, 77?36'W, 450 m, Jan. 1989 (fl), D. Neill 9144 (holotype, MO; isotypes, AAU, NY, QCA, QCNE, US). Figure 1. Haec species C. poeppigii Walpers affinis sed ab eo petiolo glandibus duabus 2.5-3 mm longis, praedito lamina foliari subtus parce pilosa glabrescenteve, inflorescentia 18-24 cm longa, floribus pedicellatis, tubo corollae 30-35 mm longo, differt. Tree 7-9 m tall; branches lanate at tip and glabrescent on the lower part, flattened to tetragonal or 5-angled, hollow; nodes obliquely annulate, glabrous or lanate. Leaves ternate, blades thinchartaceous, elliptic to elliptic-obovate, sometimes unequal in size on the same node, 13-26 x 4.5-9 cm, broadly acute and apiculate at the apex, broadly acute at the base, punctate and glabrous on upper surface, sparsely pilose to glabrescent on under surface, except along the venation, where it is puberulent; secondary veins 10-14 per side, venation impressed on the upper surface and prominent on lower surface; margins entire; petioles 2-5 cm long, sparsely adpressed pubescent, channeled above, bearing a pair of glands on the upper 3/4 part of its length, 2.5-3 mm long. Inflorescence racemose, axillary, one or two per node, nutant, simple, rachis about 5 mm thick and 1824 cm long, loosely many-flowered, sparsely pilose; bracts acuminate 2 mm long; pedicels ca. 2 mm long. Calyx 5-7 mm long, 5-dentate, the teeth very broadly rounded and apiculate, sometimes with round-shaped glands, about 5 mm wide at the mouth, externally minutely puberulent; sericeous adpressed pubescent internally; corolla white, infundibular; its tube 30-35 mm long, externally glabrous, internally pubescent at the mouth and around the stamen insertion, 5-parted; lobes ovate-lingulate, 6-7 X 3-4 mm; stamens 5, 3 NovoN 7: 95-97. 1997. This content downloaded from 157.55.39.203 on Sat, 10 Jun 2017 18:05:18 UTC All use subject to http://about.jstor.org/terms