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The genera of Leguminosae-Caesalpinioideae & Swartzieae

L. Watson and M.J. Dallwitz

Storckiella Seem.

Doga Baill., Storkiella Auct.

Type species: S. vitiensis Seem.

Habit and leaf form. Tall trees; unarmed.

Phyllotaxy spiral. The leaves compound; pinnate; imparipinnate. The leaflets without noticeably twisted petiolules; symmetrical or nearly so; leathery,ovate-lanceolate-acuminate, pinnately veined, with a predominant ‘midrib’. Stipules absent or early caducous or very inconspicuous in mature leaves (minute); membranous. Stipels absent.

Inflorescence and floral morphology. The inflorescences terminal; branched; of cymose units; panicles. The flowers not distichous. Bracts absent at anthesis (very caducous). Bracteoles present; small, not enclosing the flower buds; very caducous, absent at anthesis.

The flowers hermaphrodite; not pentamerous throughout; departing from pentamery in the androecium, or in the calyx, in the corolla, and in the androecium; coloured. Floral tube length relative to total hypanthium + calyx length about 0.25. Hypanthium present; saucer-shaped. The perianth more or less actinomorphic, comprising distinct calyx and corolla. Calyx 4, or 5; covering the rest of the flower in bud; polysepalous; more or less regular; members imbricate. Corolla present; regular, or slightly irregular, or very irregular (the adaxial, inner petal sometimes reduced or lacking); isomerous with the calyx, 4, or 5; including greatly reduced members, or without greatly reduced members; polypetalous. Petals oblong, sessile; imbricate; imbricate-ascending; yellow. The androecium comprising 4–26 members (or more); not declinate; members all free of one another (the filaments filiform); comprising only fertile stamens. Fertile stamens 4, or 8–12, or 13–26 (or more). Anthers attached at the base of the connective; dehiscing via pores or short slits. Ovary sessile or subsessile; free. Stigma obtuse, not dilated (on the shortly subulate style). Ovules numerous.

Fruit, seed and seedling. Fruit a two-valved pod; straight, or curved; winged longitudinally (along the adaxial suture); not becoming woody. The mature valves without prominent venation. Seeds endospermic; with a straight or slightly oblique radicle; amyloid-negative.

Transverse section of lamina. Leaves with conspicuous phloem transfer cells in the minor veins. Druses common in the mesophyll, or absent from the mesophyll. Mesophyll secretory cavities absent. Adaxial hypodermis absent. Leaf girders common (the veins transcurrent). Laminae dorsiventral. Mesophyll without unaligned fibres or sclereids. Minor veins mainly with abundant accompanying fibres.

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

Wood anatomy. Wood storied.

Pollen ultrastructure. Tectum punctate; smooth punctate, or puncticulate. Length of colpi greater than one half pole to pole distance.

Cytology. Basic chromosome number, x = 14. 2n = 28.

Species number and distribution. 2 species (S. australiensis, S. vitiensis). New Caledonia, Fiji.

Tribe. Cassieae.

Miscellaneous. Illustrations: • S. vitiensis : Flora Vitiensis (1865).

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.’.