| # The genera of Leguminosae-Caesalpinioideae and 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.

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: 4th August 2019. delta-intkey.com’.

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