The genera of Leguminosae-Caesalpinioideae & Swartzieae
~ Bauhinia, Phanera.
Type species: B. dipterus (Miq.) de Wit.
Habit and leaf form. Climbers or scramblers; with tendrils; unarmed.
The leaves compound; bifoliolate; paripinnate. The leaflets few per leaf (two); opposite or sub-opposite; sessile to sub-sessile.
Inflorescence and floral morphology. The inflorescences of B. dipturus unbranched (see illustration); simple racemes. Bracts persistent beyond anthesis. Bracteoles present; relatively large and enclosing the flower buds; persistent beyond anthesis.
The flowers hermaphrodite; not pentamerous throughout; departing from pentamery in the calyx and in the androecium; coloured. Hypanthium present; fairly long; cupular, or tubular. Calyx 2–3; gamosepalous; more or less regular, or markedly irregular. Corolla present; slightly irregular; 5; without greatly reduced members; polypetalous. Petals all clawed; imbricate; imbricate-ascending; white, or red. The androecium comprising 10 members; members all free of one another; members markedly unequal; comprising only fertile stamens. Fertile stamens 10. Anthers attached well above the base of the connective; dehiscing longitudinally. Ovary stipitate; free. Stigma dilated. Ovules numerous.
Fruit, seed and seedling. Fruit a two-valved pod; without markedly twisting or enrolling valves; not becoming woody. Seeds endospermic; arillate (the hilum crescentic); with a straight or slightly oblique radicle.
Transverse section of lamina. Leaves without conspicuous phloem transfer cells in the minor veins. Druses common in the mesophyll, or absent from the mesophyll. Mesophyll secretory cavities absent. Adaxial hypodermis absent. 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 not seen. No compound or branched eglandular hairs seen. Capitate glands not seen. Expanded and embedded hair-feet absent. Adaxial: Adaxial interveinal epidermal cell walls straight in optical section; conspicuously pitted; of medium thickness. Stomata adaxially very rare. Abaxial: Abaxial stomata predominantly paracytic. Abaxial epidermis not papillate. Abaxial interveinal epidermal cell walls straight, or gently undulating; conspicuously pitted in optical section; staining normally with safranin; thin.
Species number and distribution. 1 species (B. dipterus, = Bauhinia yunnanensis). Borneo, China.
Miscellaneous. Illustrations: • B. dipterus (cf. Bauhinia yunnanensis): Bot. Mag. 128 (1902).
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. delta-intkey.com/caes’.