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Flora of Australia Online

RHYSOTOECHIA

S.T.Reynolds

Rhysotoechia Radlk., Act. Congr. Bot. Amsterdam 61 (1877), = Sapind. Holl.-Ind. 131 (1879); from the Greek rhysos (shrivelled) and toichos (wall), referring to wrinkled fruit walls

Type: Rhysotoechia mortoniana (F.Muell.) Radlk.

Monoecious trees. Leaves paripinnate; leaflets subopposite or opposite, entire, coriaceous, usually shiny, drying yellow-green. Inflorescence axillary or subterminal, panicle-like; cymules stalked. Flowers regular. Calyx 5-partite; lobes 2-seriate, imbricate, the outer pair smaller, suborbicular or elliptic, concave, margins petaloid, ciliolate. Petals 5, obovate, with bilobed scales or with thickened basal margins; crests absent. Disc complete. Stamens 7 or 8; filaments hairy towards base. Ovary 2- or 3-locular; ovule 1 per locule; style persistent. Fruit subglobose, obovoid or obcordate, apiculate, 2- or 3-lobed, turgid, loculicidally dehiscent; valves slightly fleshy, glabrous, mostly glandular inside, drying wrinkled and reflexed. Seed ellipsoidal, shiny, black, with small fleshy, yellow, basal aril. 

A genus of c. 14 species in Philippines, Borneo, New Guinea and Australia; the Flora of Australia publication listed 4 species in Australia, all endemic. The Australian Plant Census lists 5 species. 

Characterised by the inflated, usually obovoid fruits, small aril at base of seed and petaloid margins of the sepals. The leaves usually dry yellow-green and have sunken glands on lower surfaces of leaflets in most species.

K.Domin, Biblioth. Bot. 89: 351 (1927); L.A.T.Radlkofer, Pflanzenr. 98: 1209–1216 (1933); S.T.Reynolds, Austrobaileya 2: 41–44 (1984).

1 Petals with scales; leaflets 1–3 pairs

2

1: Petals scaleless, usually with slightly thickened basal margins; leaflets 2–6 pairs

3

2 Leaves usually bifoliolate, broadly obtuse or subacute; petiolule 2–7 mm long; fruit sessile

bifoliolata

2: Leaflets 2 or 3 pairs, usually acute or acuminate; petiolule 8–18 mm long; fruit stipitate

mortoniana

3 Branchlets glabrous; leaflets vernicose, finely densely nerved; petiolule 7–10 mm long; fruit 2-locular

flavescens

3: Branchlets villous at apex; leaflets not vernicose, openly and coarsely nerved; petiolule 2–6 mm long; fruit 3-locular

robertsonii

4 Published since the Flora of Australia treatment

florulenta

 

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