Smooth Nut-Rush is an erect clustered, perennial herb,
50-100 cm tall. Stem is 3-angled, smooth. Leaves are scattered all
along the stem, linear, 9 mm wide, margins rough, gradually narrowed to
an pointed tip; sheaths narrow, 7-12 cm long, 3-angled, not winged,
mouth brown, finely velvet-hairy; contraligule reddish, fringed with
hairs, 1-2 mm long, blunt. Flowers are borne in 1 panicle at branch-end
and 2-5 lateral. Flower-cluster-stalks are shortly exerted from the
sheaths; primary bracts leaf-like, exceeding the inflorescence,
secondary ones smaller, bristly. Spikelets are unisexual, brown; male
spikelets stalked, oblong, 3.5 mm long; female spikelets ovoid, 4-4.5
mm, male part represented by a single glume; glumes 3-4, ovate-pointed,
4 mm long, 1-nerved. Stamens 3, anthers 1.5 mm long. Nut is spherical,
oblate, depressed tip, 2.2-2.5 x 2.5-3 mm, hairless, smooth, shining
white, shorter than the subtending glume. Smooth Nut-Rush is found in
Tropical Asia.
Identification credit: Preetha P.S.
Photographed in Palode, Thiruvananthapuram, Kerala.
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The flower labeled Smooth Nut-Rush is ...