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The genera of Leguminosae-Caesalpinioideae & Swartzieae

L. Watson and M.J. Dallwitz

Brenierea Humbert

Type species: B. insignis Humbert.

Habit and leaf form. Xeromorphic arbres (the branchlets consisting of cladodes with gland-like, peltate scales); inermes.

Phyllotaxie distique. Feuilles composées; early caducous, bifoliées. Folioles peu nombreuses sur chaque feuille (two); pétiolulées; the leaflets palmately veined (ftom the base). Stipules absents ou rapidement caduques ou très rudimentaires (minute); ni foliacées ni épineuses. Stipelles absents.

Inflorescence and floral morphology. The flowers aggregated into inflorescences (comprising short spiciform racemes of 10–20 flowers, borne in notches at the nodes of the cladodes). Inflorescences axillaires; the inflorescences simple; racèmes simples. Fleurs pas distiques. Bractées minute. Bractéoles présentes (these minute); petites, n'enveloppant pas les boutons; pas valvaires; libres.

Fleurs petites (4–5 mm long); hermaphrodites; flowers only slightly irregular; pas entièrement pentamères; se démarquant de la pentamérie dans la corolle. Hypanthe absent. Perianth exclusively sepaline (though the staminodes could be mistaken for petals). Calice présent; 5 partite; gamosépalé (campanulate, with 5 triangular, obtuse teeth and minute scales outside); plus ou moins régulier; pas imbriqué (valvate). Corolle absente. Disque absent. The androecium comprising 10 members; not declinate; androcée ayant ses éléments tous isolés les uns des autres (the fertile stamens internal to and opposite the petaloid staminodes); androcée ayant des éléments notablement inégaux (those of the staminal whorl exceeding the staminodal one); androcée avec des staminodes. The staminodia 5; petaloid, narrowly linear-obovate. Étamines fertiles 5. Anthères attachés nettement au dessus de la base du connectif (medifixed, versatile); déhiscence longitudinale. Ovaire sessile ou sub-sessile; libre. Le stigmate capitate, sessile, s'est dilaté. Ovule(s) solitaire to peu nombreux.

Fruit, seed and seedling. Fruit une gousse bi-valvaire (flattened and discoid, obliquely sub-circular to oblong). Graines arillées (with a crescentic hilum, cf. Bauhinia); avec un radicule droit ou légèrement oblique. Cotylédons plats (thick).

Pollen ultrastructure. Tectum réticulé.

Species number and distribution. 1 espèces (B. insignis). Madagascar.

Tribe. Cercideae.

Miscellaneous. Illustrations: • B. insignis: flower, fruit and seed (Wunderlin & Larsen, 1981).

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Cite this publication as: ‘Watson, L., and Dallwitz, M.J. 1993 onwards. The genera of Leguminosae-Caesalpinioideae and Swartzieae: descriptions, illustrations, identification, and information retrieval. In English and French. Version: 22nd March 2017.’.