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Flora of Australia Online

ELATTOSTACHYS

S.T.Reynolds

Elattostachys (Blume) Radlk., Act. Congr. Bot. Amsterdam 82, 107, 112 (1877), = Sapind. Holl.-Ind. 13, 37, 42 (1879); from the Greek elatton (little), and stachys (spike), referring to the inflorescence of some species

Type: not designated.

Monoecious trees. Branchlets lenticellate, hairy towards apex with simple hairs. Leaves petiolate, paripinnate; leaflets opposite to alternate, entire, serrate or serrulate, domatia usually present along midrib. Inflorescence a raceme or raceme-like or panicle-like, axillary, spike-like when young; bracts minute. Flowers regular, pedicels slender. Calyx shortly cupular, 5-partite, hairy outside. Petals 5, clawed; scales 2, auriculiform, villous, crestless. Disc regular, cupular, glabrous. Stamens 6–8; filaments filiform. Ovary sessile, 3-locular, 1 ovule per locule; style simple. Fruit obovoid, subellipsoidal or subglobose, usually 3-sulcate, loculicidally dehiscent, 3-valved; valves thick, drying woody, granular, villous inside; pericarp ±fleshy. Seed obovoid, shiny, with small, dorsal aril at its base. 

A genus of 13 species in Philippines, Indonesia, Pacific Islands, New Guinea and eastern Australia; four species in Australia, all endemic. 

The fruits with woody valves, pink at the sutures, and the simple raceme- or panicle-like inflorescence distinguish the genus. The leaves of most species dry blackish or dark brown.

L.A.T.Radlkofer, Pflanzenr. 98: 1258 (1933); K.Domin, Biblioth. Bot. 89: 353–354 (1927).

1 Domatia present

2

1: Domatia absent

3

2 Domatia prominent; leaflets mostly hairy, serrate or serrulate, rarely entire; petals 2.5–5 mm long

xylocarpa

2: Domatia inconspicuous; leaflets glabrous, entire, rarely sparsely serrulate; petals 6.5–7 mm long

megalantha

3 Fruit hairy, yellow-green; calyx crispate-hairy; leaflets 1 or 2 pairs, rarely 3

4

3: Fruit glabrous outside, pink or red; calyx usually with straight hairs; leaflets 2–4 pairs

5

4 Leaflets 4–8.5 cm long, 1–5 cm wide, serrate, serrulate, rarely entire; petals 2.5–5 mm long; lateral nerves not decurrent

xylocarpa

4: Leaflets 10–16 cm long, 3.5–6.5 cm wide, usually entire; petals 6.5–7 mm long; lateral nerves decurrent on midrib

megalantha

5 Fruit 1–2 cm long and wide; leaflets 2 or 3 pairs, 4–5 times as long as wide, strongly nerved, thick and glossy

nervosa

5: Fruit less than 1 cm long and wide; leaflets 2–6 pairs, 3 times as long as wide, usually regularly finely nerved, thin

microcarpa

 

Data derived from Flora of Australia Volume 25 (1985), a product of ABRS, ©Commonwealth of Australia