Abstract
Perennial or rarely annual herbs, subshrubs, shrubs or rarely small trees; perennial herbs with fibrous roots or with rooting above- or underground stems, rootstocks, rhizomes, scaly rhizomes, or tubers; terrestrial, epiphytic or climbing. Stem erect, ascending, decumbent, creeping, pendulous, or ± absent. Leaves opposite, sometimes in whorls of three or four, or in near-distichous or spiral-alternate arrangement; usually petiolate; stipules absent; lamina usually undivided, rarely lobed or pinnately dissected. Number of leaf pairs sometimes reduced to the cotyledonary pair, with one of the two cotyledons growing up to a large, foliar organ. Indumentum of stem and leaves of glandular and eglandular hairs, rarely absent. Inflorescences a foliose or (rarely) bracteose indeterminate thyrse with axillary pair-flowered cymes; cymes sometimes reduced to solitary flowers; bracteolate or rarely ebracteolate. Flowers usually showy, zoophilous, rarely auto- or cleistogamous, 5- (rarely 4-)merous.
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Weber, A. (2004). Gesneriaceae. In: Kadereit, J.W. (eds) Flowering Plants · Dicotyledons. The Families and Genera of Vascular Plants, vol 7. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-18617-2_8
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