The Genera of Leguminosae-Caesalpinioideae and Swartzieae
Habit and leaf form. Trees; without tendrils; unarmed. Phyllotaxy distichous. Leaves compound; pinnate; imparipinnate. Leaflets many per leaf; opposite or sub-opposite, or alternate; with petiolules not noticeably twisted. Stipels absent.
Inflorescence and floral morphology. Flowers hermaphrodite; not pentamerous throughout; departing from pentamery in the calyx, in the corolla, and in the androecium; in simple racemes, or in panicles; not distichous. Inflorescences of racemose units. Bracteoles present; small, not enclosing the flower buds; persistent beyond anthesis. Length of floral tube relative to total hypanthium plus calyx length, about 0.25. Calyx gamosepalous; covering the rest of the flower in bud; more or less regular, or markedly zygomorphic; 2 partite, or 3 partite; not imbricate; Swartzieae type (closed before flowering, splitting more or less irregularly into valvate lobes or teeth). Corolla absent. Disk present and conspicuous. Androecium of more than ten parts; with united members; members all more or less equal in length; without staminodia. Fertile stamens 12–18. Anthers attached well above base of connective. Dehiscence longitudinal. Ovary stipitate; free. Ovules numerous.
Fruit, seed and seedling. Fruit indehiscent; not becoming woody; not winged. Seeds not arillate; amyloid-negative; with starch.
Transverse section of lamina. Leaves without conspicuous phloem transfer cells in the minor veins. Druses absent from the mesophyll. Mesophyll secretory cavities (gland-dots) common; without a lining of epithelium. Adaxial hypodermis present. Leaf girders common (the veins transcurrent). Laminae dorsiventral. Mesophyll without unaligned fibres or sclereids. Minor veins mainly with abundant accompanying fibres.
Leaf lamina epidermes. Epidermal crystals not seen either adaxially or abaxially. Simple unbranched hairs common; scabrid. No compound or branched eglandular hairs seen. Capitate glands not seen. Hooked hairs not seen. Cassieae-type leaf pseudo-glands not seen. Expanded and embedded hair-feet present; all medium to thick-walled; hair feet all simple, without vertical walls. Adaxial interveinal epidermal cell walls straight in optical section; conspicuously pitted, or not conspicuously pitted; thick. Stomata adaxially very rare. Abaxial stomata not predominantly paracytic (cyclocytic). Abaxial epidermis not papillate. Abaxial interveinal epidermal cell walls straight, or gently undulating; conspicuously pitted in optical section, or not conspicuously pitted in optical section; staining normally with safranin; thick.
Wood anatomy. Wood storied.
Pollen ultrastructure. Tectum punctate; rugulose punctate. Length of colpi greater than one half pole to pole distance.
Cytology, geography, etc. 1 species. Tropical Africa. Not widely cultivated.
Tribe. Swartzieae (Papilionoideae).
The interactive key provides access to the character list, full and partial descriptions, diagnostic descriptions, differences and similarities between taxa, lists of taxa exhibiting specified attributes, and summaries of attributes within groups of taxa.
Cite this publication as: ‘Watson, L., and Dallwitz, M.J. 1993 onwards. The genera of Leguminosae-Caesalpinioideae and Swartzieae: descriptions, identification, and information retrieval. In English and French; French translation by E. Chenin. Version: 22nd March 2009. http://delta-intkey.com’.