Allophylastrum: a new genus of Sapindaceae from northern South America Author Acevedo-Rodriguez, Pedro text PhytoKeys 2011 5 39 43 http://dx.doi.org/10.3897/phytokeys.5.1684 journal article http://dx.doi.org/10.3897/phytokeys.5.1684 1314-2003-5-39 542DFFB0FFCBFFEDC07AF074C379FFC6 576080 Allophylastrum Acev.-Rodr. gen. nov. Latin. A Allophylus flore solitario, apetalo, nectaris cupulato differt Type. A. frutescens Acev.-Rodr. Description. Small trees or shrubs. Stipules wanting. Leaves alternate, trifoliolate; leaflets serrate. Flowers solitary, axillary or in short racemes, actinomorphic, unisexual with staminate flowers sometimes bearing a rudimentary 2-locular gynoecium; pedicels elongated, non-articulate; calyx 4-merous, sepals of similar length, in two whorls; petals wanting; disc cupular; stamens (5)6, the filaments slightly of unequal length, connate at base, ovary 2-locular, with a single ovule per locule. Fruit of 1-2 basally connate, indehiscent monocarps, with fleshy exocarp, and a semi-woody endocarp; seeds exarillate, with papery testa. Distribution. One species, known only from Guyana and Brazil (Roraima). Discusssion. The new genus is morphologically similar to Allophylus as they share similar shrubby-arboreal habit, and trifoliolate leaves without stipules ( Acevedo-Rodriguez et al. 2011). Key to Allophylastrum and Allophylus

1	Flowers actinomorphic, apetalous, solitary, or in short axillary racemes; nectary disc cupular; pedicel non-articulate,>4 times as long as the calyx; pollen 4- to 5-porate, 4- or 5-angled in polar view	Allophylastrum
-	Flowers zygomorphic, petaliferous, on lateral cincinni in a racemiform or paniculate thyrse; nectary disc unilateral, semi-annular, 2- to 4-lobed, or rarely annular; pedicels articulate, 1-2 times as long as the sepals; pollen 3-porate, triangular in polar view	Allophylus

Etymology. The name Allophylastrum is proposed to indicate its close resemblance to Allophylus .