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FOC | Family List | FOC Vol. 19 | Rubiaceae

80. Rubovietnamia Tirvengadum, Biogeographica (Paris). 74(4): 166. 1998.

越南茜属 yue nan qian shu

Authors: Tao Chen & Charlotte M. Taylor

Shrubs, unarmed, sometimes with some internodes markedly shortened. Raphides absent. Leaves opposite, sometimes appearing ternate due to reduced internode and marked anisophylly grouping 2 leaves at one node plus an apparently solitary leaf at another node, usually with domatia, at apex sometimes aristate; stipules caducous to late deciduous, shortly united around stem, triangular, inside (i.e., adaxially) pubescent, sometimes aristate. Inflorescences terminal and/or pseudoaxillary, cymose and 2-8-flowered or sometimes reduced to 1 flower, pedunculate, bracteate with bracts often stipuliform. Flowers pedunculate or pedicellate, bisexual, monomorphic. Calyx limb deeply 5-lobed; lobes sometimes imbricate in bud. Corolla white turning yellow with age, salverform to funnelform, inside glabrous except with a pilosulous ring near base; lobes 5, convolute in bud. Stamens 5, inserted near corolla throat, partially exserted; filaments reduced; anthers dorsifixed near base, becoming twisted with age, shortly sagittate at base, with connective prolonged in an apical triangular appendage. Ovary 1-celled, ovules 2-4 on parietal placentas; stigmas 2, spatulate, partially exserted. Fruit baccate, fleshy to leathery, subglobose, smooth, mature color unknown, with calyx limb tardily deciduous; seeds few to several, medium-sized, ovoid to subglobose, smooth; endosperm abundant; embryo minute, basal, nail-shaped; radicle slightly longer than cotyledons; cotyledons suborbicular.

Two species: China, Vietnam; two species (one endemic) in China.

The protologue figure is labeled "Vidalasia aristata," but this species was treated in the text in Rubovietnamia; Vidalasia Tirvengadum was also described in this same article, and presumably R. aristata was to be included in that genus initially. Vidalasia has several-flowered compound cymes, erose-setose stipules and bracts, numerous ovules and seeds, and probably may be expected in China also.

1 Leaf blade elliptic or oblanceolate, 4-12 × 1.5-4 cm, adaxially glabrescent to sparsely strigillose, abaxially sparsely strigillose, apex acuminate and aristate; stipules on each side deltoid to ovate, caudate-acuminate; corolla tube cylindrical, lobes glabrous inside, hairy outside; fruit strigillose to glabrescent.   1 R. aristata
+ Leaf blade obovate, 8-18 × 3-5 cm, densely pubescent on both surfaces, apex acuminate; stipules terminating with reduced interpetiolar limbs; corolla tube funnelform, lobes mostly glabrous inside, pubescent outside; fruit tomentose.   2 R. nonggangensis

Lower Taxa


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