The Genera of Leguminosae-Caesalpinioideae and Swartzieae
| The Genera of Leguminosae-Caesalpinioideae and Swartzieae | |
= Dialium.
Habit and leaf form. Trees; without tendrils; unarmed. Phyllotaxy spiral. Leaves simple (1-foliolate, petiole jointed at base and apex). Leaflets with petiolules not noticeably twisted. Stipules absent or early caducous or very inconspicuous; neither leafy nor spinescent. Stipels absent.
Inflorescence and floral morphology. Flowers small; hermaphrodite; not pentamerous throughout; departing from pentamery in the calyx, in the corolla, and in the androecium; white or green; not distichous. Inflorescences axillary; of cymose units. Bracts absent at anthesis (caducous, minute). Bracteoles present; small, not enclosing the flower buds (minute); absent at anthesis, or persistent beyond anthesis. Hypanthium absent. Calyx polysepalous; covering the rest of the flower in bud; markedly zygomorphic (outer lobe hooded); 3 partite; imbricate. Corolla absent. Disk absent. Androecium of fewer than ten parts; members all free of one another; members all more or less equal in length; without staminodia. Fertile stamens 6. Anthers attached at base of connective. Dehiscence via pores or short slits. Ovary sessile or subsessile; free (the style straight, tip recurved). Ovules few.
Fruit, seed and seedling. Fruit indehiscent (crustaceous exocarp and pulpy endocarp); drupaceous; not winged.
Transverse section of lamina. Druses absent from the mesophyll. Mesophyll secretory cavities absent. Adaxial hypodermis absent. Leaf girders absent. Laminae dorsiventral. Minor veins mainly with abundant accompanying fibres.
Leaf lamina epidermes. Epidermal crystals present (adaxial); in irregular clumps. Simple unbranched hairs common; scabrid. No compound or branched eglandular hairs seen. Capitate glands not seen. Hooked hairs present. Cassieae-type leaf pseudo-glands present. Expanded and embedded hair-feet absent. Basally bent hairs absent. Adaxial interveinal epidermal cell walls markedly sinuous in high-focus optical section; conspicuously pitted. Stomata adaxially very rare. Abaxial stomata predominantly paracytic. Abaxial epidermis not papillate. Abaxial interveinal epidermal cell walls markedly sinuous in high-focus optical section; conspicuously pitted in optical section; staining normally with safranin.
Pollen ultrastructure. Tectum punctate; rugulose punctate. Length of colpi greater than one half pole to pole distance. Foot layer of pollen wall with obvious projections.
Cytology, geography, etc. 1 species. Sumatra. Not widely cultivated.
Tribe. Cassieae.
The interactive key provides access to the character list, full and partial descriptions, diagnostic descriptions, differences and similarities between taxa, lists of taxa exhibiting specified attributes, and summaries of attributes within groups of taxa.
Cite this publication as: ‘Watson, L., and Dallwitz, M.J. 1993 onwards. The genera of Leguminosae-Caesalpinioideae and Swartzieae: descriptions, identification, and information retrieval. In English and French; French translation by E. Chenin. Version: 19th October 2005. http://delta-intkey.com’.