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46. Polypleurum Warming

Polypleurum Warming, Overs. Kong. Danske Vid. Selsk. Skr. VI,  11(1): 464 (1901).
Podostemum auctt. Ind., non A. Michaux (1803).

Roots usually ribbon-like or sometimes thread-like, usually lower part closely attached to rock with  upper part free, or sometimes entirely attached to rock; free parts usually repeatedly forked, up to 50 cm long, rather tough, sometimes resembling Fucus; holdfasts often branched; stems short, developed endogenously at sometimes almost regular intervals along or near  margin of root, bearing 2--8 or rarely more leaves; vegetative stems 0; flowering stems unbranched, less than 5 mm long. Leaves imbricate, scale-like, entire or lobed, with or without a caducous, elongate apical appendage. Spathellas sessile, ovoid to club-shaped, opening irregularly at tip. Flowers solitary, pedicellate; pedicel up to 1 cm long in fruit; tepals 2, 1 each side of  andropodium or stamen, flattened, subulate; stamens 2 (1), when 2 then borne on an andropodium; pollen in dyads. Capsules ellipsoidal, 2--3 mm long, sometimes laterally somewhat flattened; valves equal and persistent, each with 3, 5 or 7 ribs; style short or 0; stigmas linear or subconical. Seeds up to 200 or more. About eight spp., Sri Lanka, India & Thailand. Podostemum munnarense (Nagendran & Arekal) Mathew & Satheesh belongs to Polypleurum.

Subfam. Podostemoideae

Polypleurum stylosum. E Seaweed-like root with marginal flowering shoots (1 cm). F Flowering shoot (2 mm).

Cook & Rutishauser 2007

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