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17. Isoglossa Oersted, Vidensk. Meddel. Dansk Naturhist. Foren. Kjøbenhavn. 1854: 155. 1854.
叉序草属 cha xu cao shu
Authors: Jia-qi Hu & Thomas F. Daniel
Chingiacanthus Handel-Mazzetti; Ecteinanthus T. Anderson; Leda C. B. Clarke (1908), not Bory (1822) [Algae]; Rhytiglossa Nees; Strophacanthus Lindau.
Shrubs or herbs, with cystoliths, isophyllous or slightly anisophyllous. Leaves petiolate. Inflorescences terminal and/or sometimes axillary, open panicles or thyrses; bracts small, shorter than calyx. Calyx deeply 5-lobed, lobes similar. Corolla funnel-shaped, 2-lipped; lower lip 3-lobed; upper lip shortly 2-lobed, lacking a stylar furrow (i.e., erugulate); lobes ascending cochlear in bud. Stamens 2; anthers 2-thecous; thecae equal or unequal, parallel (to perpendicular), subequally to unequally inserted, base muticous; staminodes absent; pollen 2-pororate [elsewhere also 3-colporate and 6-pseudocolpate]. Ovary with 2 ovules per locule. Capsule clavate with a solid sterile basal stalk, 4-seeded; retinacula present; septa with attached retinacula remaining attached to inner wall of mature capsule. Seeds subdiscoid.
About 50 species: tropical Africa and Asia; two species (one endemic) in China.
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Calyx lobes subulate, widest at base; inflorescence long branched, widely paniculate. |
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1 I. collina |
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Calyx lobes spatulate-oblanceolate, widest above middle; inflorescence shortly branched, narrowly paniculate or thyrsoid. |
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2 I. glabra |
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Lower Taxa
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