Allophylastrum

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Taxonavigation

Ordo: Sapindales
Familia: Sapindaceae

Name

Allophylastrum Acev.-Rodr. gen. nov. – Wikispecies link – IPNI link – Pensoft Profile

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-Rodríguez et al. 2011).

Key to Allophylastrum and Allophylus

Key to Allophylastrum and Allophylus — P. Acevedo-Rodríguez

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.

Original Description

• Acevedo-Rodríguez, P; 2011: Allophylastrum: a new genus of Sapindaceae from northern South America PhytoKeys, 5: 39-43. doi