Botanical Survey of India | Flora of India

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Macrosolen (Blume) Rchb.


Shrubs, entirely glabrous. Leaves opposite, more or less distichous, petiolate, ellipticovate, curvipinnate, glabrous. Inflorescences centrifugal pseudoracemes, spikes or sometimes contracted into peduncled umbels; flower buds constricted to a neck, clavate with rounded apex; flowers bracteate, bracteolate, actinomorphic, sympetalous, 5- or 6-merous; each flower subtended by 3 unequal scale-like partially connate bracteoles, fused completely with bracts and not enclosing ovary. Calyculus tubular, truncate or lobed. Petals 5 or 6, connate; tube with distinct angular shoulders; lobes reflexed. Stamens 5 or 6; filaments subterete; anthers adnate or basifixed, linear or elliptic-ovate, isothecate, elevatilobate, without sterile apex. Ovary oblong, bearing an entire calyx-rim, smooth; style articulate above the base or not; stigma capitate or broadly elliptic-ovate. Fruits urceolate or globose, rugulose or muricate with or without collar and stylar stub.

South and South-East Asia, ca 25 species; 3 in India.



KEY TO THE SPECIES


1a. Young internodes margined on three sides; old nodes meristematically knotty; leaves decurrent; inflorescence ramiflorous; flower buds spathulate; flowers 5- merous; corolla-lobes reflexed and coiled; anthers with sterile apex; ovary subturbinate, faintly tubercled; endosperm without thickened pads, but horned 3. Macrosolen trigonus
b. Young internodes not margined, old nodes not meristematically knotty; leaves not decurrent; inflorescence axillary; flower buds clavate with rounded apex; flowers 6- merous; corolla-lobes reflexed, not coiled; anthers without sterile apex; ovary oblong, smooth; endosperm with thickened pads, hornless 2
2a. Lateral nerves distinct on either surfaces; midrib evanescent towards apex; petioles flattened adaxially; flowers prominently shouldered at angles; corolla-tube splitting up to two-third the length; anthers planilobate; fruits with collar and stylar stub, rugulose; endosperm with 6 narrowly elliptic thickened pads 1. Macrosolen cochinchinensis
b. Lateral nerves obscure on either surfaces; midrib extending up to tip; petioles sulcate adaxially; flowers faintly shouldered at angles; corolla-tube splitting up to middle; anthers elevatilobate; fruits without collar and hemispherical stylar stub, muricate; endosperm with 4 thickened pads 2. Macrosolen globosus


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