The genera of Leguminosae-Caesalpinioideae & Swartzieae
Type species: C. brachystachyum (A.P. DC) Cowan.
Habit and leaf form. Trees (3–7 m); unarmed.
The leaves compound; pinnate; imparipinnate. The leaflets few per leaf (2-jugate); opposite or sub-opposite; petiolulate; without noticeably twisted petiolules; symmetrical or nearly so; pinnately veined, with a predominant midrib. Stipules membranous (minute, about 4 mm long); not connate. Stipels absent.
Inflorescence and floral morphology. The inflorescences on the previous seasons branchlets; unbranched; illustrated as simple racemes. The flowers not distichous. Bracts persistent beyond anthesis (about 4 mm long). Bracteoles absent; absent at anthesis.
The flowers hermaphrodite; not pentamerous throughout; departing from pentamery in the calyx, in the corolla, and in the androecium; coloured. Hypanthium absent, the androecium hypogynous. Calyx 4 (opening in about 4 more or less equal segments); covering the rest of the flower in bud; Swartzieae type (closed before flowering, splitting more or less irregularly into valvate lobes or teeth); polysepalous; more or less regular; members not imbricate. Corolla present; very irregular; 1; without greatly reduced members; monopetalous. Petals clawed; yellow. Disk absent. The androecium comprising about 26–50 members; members all free of one another (glabrous); members all more or less equal in length; comprising only fertile stamens. Fertile stamens 26 (or more: numerous). Anthers linear-lanceolate, longer than the filaments, attached at the base of the connective; dehiscing longitudinally. Ovary stipitate; free. Stigma not dilated (style abruptly hooked or curved, apically truncate). Ovules numerous.
Fruit, seed and seedling. The mature valves without prominent venation. Seeds with an inflexed radicle.
Wood anatomy. Wood storied; without normal intercellular canals; without traumatic canals.
Pollen ultrastructure. Tectum striate; interwoven striate. Length of colpi greater than one half pole to pole distance.
Species number and distribution. 1 species (C. brachystachyum). South America.
Miscellaneous. Illustrations: • C. brachystachyum: Cowan, Rhodora 68 (1968). • C. brachystachyum, fruit and seeds: Cowan (1977).
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’.