Small to tall rainforest trees. Adult leaves simple or pinnate, entire (some pinnatisect in A. pinnatum ), tapered to petiole; intermediate leaves simple, pinnate or sinuate-lobed to pinnatifid. Conflorescence axillary or terminal, raceme-like to corymb-like, on basitonic or acrotonic seasonal growth units, usually aggregated into distinct panicle-like bunches (except in A. pinnatum ), without involucral bracts. Flowers strongly zygomorphic, bisexual, weakly incurved in bud, orange-red, crimson or pink; floral orientation diagonal. Receptacle oblique. Tepals coherent in a split tube after anthesis. Hypogynous glands fused, crescentic to horseshoe-shaped. Pollen presenter strongly oblique. Follicle woody, canoe-shaped after dehiscence. Seed wing with raphe on inner side.
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