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| Author(s): |
Viviane Renata Scalon
Total Authors: 1
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| Document type: | Doctoral Thesis |
| Press: | São Paulo. |
| Institution: | Universidade de São Paulo (USP). Instituto de Biociências (IBIOC/SB) |
| Defense date: | 2007-09-27 |
| Examining board members: |
Vinicius Castro Souza;
Haroldo Cavalcante de Lima;
Luciano Paganucci de Queiroz;
Paulo Takeo Sano;
Renato de Mello Silva
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| Advisor: | Vinicius Castro Souza |
| Abstract | |
Leguminosae - Mimosoideae comprises 80 genera and about 3,300 species, mainly distributed in tropical and subtropical regions, although some genera can reach temperate areas. We reviewed species from Stryphnodendron, which presents Neotropical distribution with northern limit in Nicaragua and southern limit in Paraná state, Brazil. This study was based on bibliographical review, consults to the main Brazilian, North American and European herbaria, and field expeditions to the genus\' natural occurrence areas. Stryphnodendron includes 36 taxa; about 89% of which occur in Brazil, and ca. 50% of these are exclusive of this country. It can be found at several kinds of vegetations, mainly at Cerrado and Amazon Forest. Only four species have not been reported to Brazil: S. excelsum Harms (Nicaragua, Costa Rica and Panama), S. levelii R.S.Cowan (Venezuela), S. moricolor Barneby & Grimes (French Guiana) and S. porcatum D.A.Neill & Occhioni f. (Ecuador). Based on its external morphology, Stryphnodendron can be characterized by its spineless habit, ferruginous terminal portion of shoots, bipinnate leaves (with extrafloral nectaries), flowers with 5¬fused sepals, 5-fused petals, corolla 2 to 6 mm long, 10 stamens, the filaments free or sometimes united just near the base, short-stipitate ovary, spike-arranged flowers, nucoid legume or follicle fruits (sensu Barroso et al. 1999), septate, and endospermous seeds with apical-basal pleurograms. We defined four distribution patterns within Stryphnodendron, twelve lectotipifications, six new synonyms, two new combinations, one species reestablishment, one nomenclatural status change, three excluded species and two were kept as doubtful names. Nine new species were also detected: Stryphnodendron conicum, Stryphnodendron dryaticum, Stryphnodendronfasciatum, Stryphnodendron holosericeum, Stryphnodendron orinocense, Stryphnodendron procerum, Stryphnodendron riparium, Stryphnodendron velutinum e Stryphnodendron venosum. (AU) | |