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The genera of Leguminosae-Caesalpinioideae & Swartzieae

L. Watson and M.J. Dallwitz

Jacqueshuberia Ducke

Type species: J. quinquangulata Ducke.

Habit and leaf form. Trees (with 5-angled branches); unarmed.

Phyllotaxy spiral. The leaves compound; bipinnate; with adaxially grooved rachides. The leaflets few per leaf. Stipules present, persistent and conspicuous in mature leaves; leafy (and pinnate). Stipels absent.

Inflorescence and floral morphology. The inflorescences terminal; unbranched, or branched; short, simple racemes, or simple corymbs. The flowers not distichous. Bracts long-setaceous. Bracteoles absent; absent at anthesis.

The flowers hermaphrodite; pentamerous; coloured. Floral tube length relative to total hypanthium + calyx length about 0.5. Hypanthium present; cupular. The perianth comprising distinct calyx and corolla. Calyx 5; covering the rest of the flower in bud; polysepalous; more or less regular; members imbricate. Corolla present; slightly irregular; 5; without greatly reduced members; polypetalous. Petals sessile; imbricate; imbricate-ascending; red. The androecium comprising 10 members; with united members (the filaments connate below into a tube that is deeply split anticously); members all more or less equal in length; comprising only fertile stamens. Fertile stamens 10. Anthers attached well above the base of the connective; dehiscing introrsely. Ovary sessile or subsessile. Stigma dilated (the style filiform, circinate in bud). Ovules numerous.

Fruit, seed and seedling. Fruit a two-valved pod; straight; without markedly twisting or enrolling valves (revolute); becoming woody. Seeds with a straight or slightly oblique radicle.

Transverse section of lamina. Druses absent from the mesophyll. Mesophyll secretory cavities absent. Adaxial hypodermis absent. Leaf girders absent. Laminae dorsiventral. Mesophyll without unaligned fibres or sclereids. Minor veins mainly with abundant accompanying fibres.

Leaf lamina epidermes. Epidermal crystals not seen either adaxially or abaxially. Simple unbranched hairs common; scabrid. No compound or branched eglandular hairs seen. Capitate glands not seen. Hooked hairs not seen. Cassieae-type leaf pseudo-glands not seen. Expanded and embedded hair-feet absent. Basally bent hairs absent. Adaxial: Adaxial interveinal epidermal cell walls straight in optical section; conspicuously pitted. Stomata adaxially very rare. Abaxial: Abaxial stomata predominantly paracytic. Abaxial epidermis not papillate. Abaxial interveinal epidermal cell walls straight, or gently undulating, or markedly sinuous in high-focus optical section; conspicuously pitted in optical section; staining normally with safranin; thin.

Wood anatomy. Wood not storied.

Pollen ultrastructure. Tectum reticulate (viscin threads present); strongly irregularly coarse-reticulate. Length of colpi less than one half pole to pole distance (without a margocolpus). Foot layer of pollen wall smooth.

Species number and distribution. 7 species (J. amplifolia, J. brevipes, J. loretensis, J. purpurea, J. pustulata, J. splendens and J. quinquangulata). Amazonian Brazil, Colombia.

Tribe. Caesalpinieae.

Comments. The pollen grains associated with viscin strands (see illustration).

Miscellaneous. Illustrations: • J. purpurea, e.m. scanned pollen (Graham & Barker, 1981).

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: 22nd March 2017.’.