The genera of Leguminosae-Caesalpinioideae & Swartzieae
Type species: L. amazonica Ducke.
Habit and leaf form. Trees; unarmed.
The leaves ostensibly simple (unifoliolate, coarsely serrate); with a predominant midrib. Stipules absent or early caducous or very inconspicuous in mature leaves (caducous).
Inflorescence and floral morphology. The inflorescences axillary; unbranched; simple racemes (these often one-sided). Bracts persistent beyond anthesis. Bracteoles present; small, not enclosing the flower buds; more or less persistent beyond anthesis, or absent at anthesis; not valvate; free.
The flowers small; hermaphrodite; pentamerous, or not pentamerous throughout; departing from pentamery in the calyx, or in the androecium. Hypanthium absent, the androecium hypogynous. The perianth comprising distinct calyx and corolla. Calyx subentire to 5 (with obscure lobes); covering the rest of the flower in bud; Swartzieae type (closed before flowering, splitting more or less irregularly into valvate lobes or teeth) (the limb membranous, subentire or obscurely 5-toothed, splitting down one side); gamosepalous (the tube rather long); members not imbricate. Corolla present; very irregular (the outer petal much broader than the other four, which are subequal); very decidous, 5; without greatly reduced members; polypetalous. Petals imbricate. The androecium comprising 9 members, or 10 members; members all more or less equal in length (to slightly unequal); comprising only fertile stamens. Fertile stamens 9–10. Anthers attached at the base of the connective (? being acum 60,2 62,1 64,1/2 65,2 inate, small, shorter than the filaments, versatile); dehiscing longitudinally. Ovary stipitate; free. Stigma small, oblique, not dilated. Ovules few, or numerous (4–6).
Fruit, seed and seedling. Fruit thick, compressed, indehiscent. Seeds with an inflexed radicle.
Wood anatomy. Wood storied; without normal intercellular canals; without traumatic canals.
Pollen ultrastructure. Tectum papillate; simple papillate. Length of colpi greater than one half pole to pole distance.
Species number and distribution. 7 species (L. amazonica, L. hatschbachii, L. lasiogyne, L. marcano-bertii, L. ovalifolia, L. peruviana, L. tango). South America.
Tribe. Papilionoideae-Exostyleae (former Swartzieae).
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’.