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The genera of Leguminosae-Caesalpinioideae & Swartzieae

L. Watson and M.J. Dallwitz

Apuleia Mart.

Apoleya Gleason, Zenkeria Arn.

Type species: A. leiocarpa (Vog.) Macbr.

Habit and leaf form. Trees; unarmed.

Phyllotaxy distichous, or spiral. The leaves compound; pinnate; imparipinnate. The leaflets few per leaf; alternate; shortly petiolulate; without noticeably twisted petiolules; symmetrical or nearly so; pinntely veined, with a predominant ‘midrib’. Stipules absent or early caducous or very inconspicuous in mature leaves; membranous. Stipels absent.

Inflorescence and floral morphology. The inflorescences small, axillary; branched; ambiguously of cymose units; panicles. The flowers not distichous. Bracteoles absent; absent at anthesis.

The flowers rather small; hermaphrodite, or hermaphrodite and unisexual (andro- or polygamo-monoecious); not pentamerous throughout; departing from pentamery in the calyx, in the corolla, and in the androecium; white or green. Floral tube length relative to total hypanthium + calyx length about 0.25. Hypanthium present; shortly cupular to tubular. Calyx 3; covering the rest of the flower in bud; polysepalous; more or less regular; members imbricate. Corolla present; regular; 3; without greatly reduced members; polypetalous. Petals imbricate; imbricate-ascending; white. The androecium comprising 3 members; comprising only fertile stamens. Fertile stamens 3. Anthers attached at the base of the connective; dehiscing longitudinally. Ovary stipitate; abaxially eccentric, with the stipe adnate. Stigma dilated. Ovules few.

Fruit, seed and seedling. Fruit indehiscent; straight; winged longitudinally (narrowly, along the upper suture); 1 winged; not becoming woody. Seeds endospermic; with a straight or slightly oblique radicle; amyloid-negative; with galactomannan.

Transverse section of lamina. Leaves without conspicuous phloem transfer cells in the minor veins. Druses absent from the mesophyll. Mesophyll secretory cavities absent. Adaxial hypodermis absent. Leaf girders absent. Laminae dorsiventral. Mesophyll without unaligned fibres or sclereids. Minor veins mainly with abundant accompanying fibres.

Leaf lamina epidermes. Epidermal crystals present; druses. Simple unbranched hairs common; scabrid. No compound or branched eglandular hairs seen. Capitate glands not seen. Hooked hairs present. Cassieae-type leaf pseudo-glands not seen. Expanded and embedded hair-feet absent. Basally bent hairs absent. Adaxial: Adaxial interveinal epidermal cell walls straight in optical section; conspicuously pitted; thick. Stomata adaxially very rare. Abaxial: Abaxial epidermis papillate interveinally; with papillae over-arching the stomata. Abaxial interveinal epidermal cell walls straight, or gently undulating; scarcely staining with safranin; thin.

Wood anatomy. Wood with septate fibres; storied. Intervascular pits medium to large.

Pollen ultrastructure. Tectum punctate; rugulose punctate. Length of colpi greater than one half pole to pole distance.

Cytology. Basic chromosome number, x = 14. 2n = 28.

Species number and distribution. 1 species (A. leiocarpa). Brazil, Peru. Argentina.

Tribe. Cassieae.

Miscellaneous. Illustrations: • A. leiocarpa (as praecox): Fl. Brasiliensis 15 (1870). • A. leiocarpa: leaflet, adaxial epidermis (part-polarized). • A. leiocarpa, e.m. scanned pollen (Graham & Barker, 1981).

We advise against extracting comparative information from the descriptions. This is much more easily achieved using the DELTA data files or the interactive key, which allows access to the character list, illustrations, full and partial descriptions, diagnostic descriptions, differences and similarities between taxa, lists of taxa exhibiting or lacking specified attributes, distributions of character states within any set of taxa, geographical distribution, and classification. See also Guidelines for using data taken from Web publications.

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.’.