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Fabaceae-Mimosoideae family

Desmanthus leptophyllus
in Humboldt, Bonpland & Kunth, Nov. Gen. Sp. 6: 208 [folio]; 6: 264 [quarto].  1824.

Indigenous woody herb of open and semi-open wasteland at low elevations.

Lesser and Greater Antilles, Trinidad, Mesoamerica, South America.

There are other similar species.
D. virgatus is prostrate or has ascending branches (sometimes long) reaching a height of 0.7m.and is not woody.
D. pernambucanus and D. leptophyllus are much taller with long stems woody at the base.
D. pernambucanus has 4 pairs of pinnae/leaf or less and pubescent stipules witha basal appendage. The pinnules are fewer and wider.
D. leptophyllus has 8 pairs of pinnae or less/leaf and glabrous stipules.
The pinnules are more numerous and narrower.