Glabrous erect perennial herbs; rootstock woody, bearing numerous unbranched annual stems. Leaves alternate, entire, often deciduous; juvenile leaves often smaller than adults. Inflorescence a terminal cyme of compound dichasia; bracts and bracteoles similar to leaves. Flowers yellow or cream; pedicels filamentous. Sepals 2 or 4, deltoid, smooth. Petals 2 or 4, spirally twisted. Stamens 4 or 8; anthers linear-oblong, 4-locular, usually shortly apiculate. Ovary 1-locular, 2–4-winged or-ribbed; ovules 4, pendulous; styles 2 or 4, clavate; stigmas capitate, shortly fimbriate. Fruit ovoid to obovoid or obovate, 2–4-winged or-ribbed, cream or yellow (sometimes reddish); wings decurrent in sepals (except G. roei ) and pedicels; pericarp between wings swollen or membranous. Seed 1.
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