Micronychia Oliv.
Creators: name: Randrianasolo, Armand
Publisher: name: Zenodo
Year: 2000
Subjects: Biodiversity
Taxonomy
Plantae
Tracheophyta
Magnoliopsida
Sapindales
Anacardiaceae
Micronychia

description: MICRONYCHIA Oliv.
Hook. Icon. Pl., ser. 3, 14: 27 (1881).
TYPE. — Micronychia madagascariensis Oliv.
Dioecious trees 3-20 m tall. Leaves alternate, simple, coriaceous, subcoriaceous or chartaceous, persistent, venation pinnate and craspedodromous or camptodromous, midvein prominent on the undersurface, secondary veins arcuate and prominent on the undersurface, forming an obtuse angle with the midrib toward leaf base. Inflorescence an axillary, subterminal or terminal, pendent panicle, pubescent. Flowers 5-merous, rarely 4- or 6-merous, unisexual, red or pink; calyx imbricate; corolla much larger than calyx, imbricate or quincuncial; stamens alternipetalous, the filament inserted basally on the outer surface of the disk, glabrous, sigmoid or reverse S-shaped (except in M. tsiramiramy) and long in male flowers, short, flattened, and broadened at the base in female flowers; anthers glabrous, dorsifixed, introrse, dehiscent by longitudinal slits, much smaller and sterile in female flowers; disk glabrous, dish-shaped in male flowers, annular and cup-shaped in female flowers; ovary unilocular, with one anatropous ovule with a long funicle, placentation parietal; the single long, trifid, lateral style with 3 capitate stigma lobes. Fruit drupaceous, one seeded, glabrous but with longitudinal striations, mesocarp resinous, pyrene with two well separated cotyledons.
Key to the species of Micronychia
1. Leaves with both surfaces glabrous; filaments straight, not exceeding 2 mm in length; style straight and short, up to 1.5 mm in length .............................................................................................................................. 2
1’. Leaves with at least one surface pubescent; filaments sigmoid, more than 4 mm in length; style curved, exceeding 3 mm in length ........................................................................................................................... 3
2. Leaf apex long acuminate ........................................................................................................ M. acuminata
2’. Leaf apex rounded, retuse or emarginate .............................................................................. M. tsiramiramy
3. Leaf blade oblanceolate, base decurrent ............................................................................... M. macrophylla
3’. Leaf blade obovate to elliptic, base not decurrent ........................................................................................ 4
4. Treelets 3 m tall; leaves 4-9 cm long, 2-4.5 cm wide, with 8-13 pairs of craspedodromous secondary veins .... ..................................................................................................................................... M. madagascariensis
4’. Trees 6-9 m; leaves 8.5-22 cm long, 4.5-11 cm wide, with 20-25 pairs of camptodromous secondary veins .. .............................................................................................................................................. M. danguyana
description: Published as part of Randrianasolo, Armand, 2000, A taxonomic revision of the Malagasy endemic genus Micronychia (Anacardiaceae), pp. 145-155 in Adansonia (3) (3) 22 (1) on pages 146-147, DOI: 10.5281/zenodo.4605738