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The genera of Leguminosae-Caesalpinioideae & Swartzieae

L. Watson and M.J. Dallwitz

Thylacanthus Tul.

~ Julbernardia.

Type species: T. ferrugineus Tul.

Habit and leaf form. Shrubs; unarmed.

The leaves compound; pinnate; paripinnate. The leaflets few per leaf (mostly comprising 3 pairs); somewhat leathery, opposite or sub-opposite. Stipules absent or early caducous or very inconspicuous in mature leaves.

Inflorescence and floral morphology. The inflorescences terminal (on the branchlets); branched; short panicles. The flowers not distichous. Bracts thick, very caducous, absent at anthesis. Bracteoles present; concave, thick, relatively large and enclosing the flower buds; persistent beyond anthesis; not valvate; connate (into a two-lobed involucre under the flower).

The flowers showy; hermaphrodite; pentamerous. Hypanthium absent, the androecium hypogynous. Calyx 5 (comprising small, petaloid, ovate-rounded, ciliate sepals); not covering the rest of the flower in bud; polysepalous; members imbricate. Corolla present; regular; 5; without greatly reduced members; polypetalous. Petals narrowly obovate, sessile; imbricate; imbricate-ascending. The androecium comprising 10 members; with united members (shortly connate basally); members all more or less equal in length (with the filaments inflexed at their apices); comprising only fertile stamens. Fertile stamens 10 (with uniform anthers). Anthers attached well above the base of the connective; dehiscing longitudinally. Ovary sessile or subsessile; free. Stigma dilated (peltate, the style long, involute in bud). Ovules few.

Fruit, seed and seedling. Seeds with a straight or slightly oblique radicle.

Species number and distribution. 1 species (T. ferrugineus). Amazonian Brazil.

Tribe. Detarieae.

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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.’.