Abstract
Legume is the characteristic fruit of Leguminosae, but this botanical family has variability in fruits. The purpose of this study was to describe morphologycally fruits and seeds of Senna obtusifolia (L.) H.S.Irwin & Barneby, S. occidentalis (L.) Link. and S. tapajozensis (Ducke) Irwin and Barneby. General characteristics of fruits were described: morphology, classification, coloration, pericarp texture and consistence, dehiscence and indument. Morphological characters of seeds analyzed: a) external: shape, testa consistence, color and texture, hilum and micropyle position and form; b) internal: seed coat, endosperm and type, shape and color of the embryo. The studied species present legume and follicle fruit types, lineal, and broadly lineal, dry pericarp, cartaceous and subligneous, glabrous without magnifying glass, in brown tones and dehiscent. Seeds were obovate, suborbicular, elliptical with a straight side or irregularly rhombic, tests in brown and grayish tones, complete pleurogram, when present, punctiforme and orbicular hiulum, axial and foliaceous embryo, straight and oblique embryonic axis, and rudimentary plumule. The pericarp indument and pleurogram were the main external feature to separate the studied species. Keywords: Senna obtusifolia ; S. occidentalis ; S. tapajozensis ; Cassieae; Cassiinae.
Highlights
Legume is the characteristic fruit of Leguminosae, but this botanical family has variability in fruits
Ao revisar as características dos frutos que ocorrem em Caesalpinioideae, Burkart (1952) e Watson (1981) notaram que as formas mais comuns entre os legumes são a comprimida e linear à oblonga, com suturas finas a muito espessas e lenhosas
Flora Fanerogâmica da Ilha do Cardoso: Vol., São Paulo: Instituto de Botânica, 2010
Summary
Senna obtusifolia (L.) H.S.Irwin & Barneby Senna occidentalis (L.) Link. Senna tapajozensis (Ducke) H.S.Irwin & Barneby. Uma sub-amostra com 25 frutos e 25 sementes foi retirada aleatoriamente para a análise morfológica. 3. Resultados Senna obtusifolia (L.) H.S.Irwin & Barneby – Pedúnculo do fruto com 3,03 8,48 (2,61 – 3,58) cm compr., sublenhoso, estriado, cálice rígido, com cicatrizes das peças florais visíveis (Figura 1B), puberulento, com tricomas adpressos, castanho-claros. 0,65 cm (Figura 1C), base cuneada, atenuada, subestipitada, estípite espessado, tricomas semelhantes aos do pedúnculo, mas mais densos margens inteiras, constrictas, nervuras dorsal e ventral caracterizadas por uma linha rígida e saliente que vai da base ao ápice do fruto. Cartáceo, externamente opaco, faces suavemente onduladas bastante susceptíveis à colonização por fungos, com nervuras transversais levemente elevadas e raros tricomas castanho-claros, adpressos, visíveis com o auxílio de lupa, brilhante internamente, em tons castanhos mais escuros e septado (Figura 1D). Dimensões (cm), desvio padrão e coeficiente de variação (C.V.) dos frutos das espécies de Senna
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