Ribbed-Stem Pipewort is a slender clustered annual
herb up to 11 cm tall. Leaves are linear, 10-35 cm, 4-13 mm wide at
middle, veins 15-37. Flowering stems are 5-20 together, 20-60 cm tall,
4-6-ribbed; sheath 4-12 cm; receptacle hairless. Flower-heads are
nearly spherical, about 6.5 mm in diameter, glaucous, base flat;
involucral bracts straw-colored, obovate, 2.2-2.4 mm in diameter,
rigid, below white; floral bracts obovate to obovate-wedge-shaped,
2-2.5 mm, below hairy toward tip. Ribbed-Stem Pipewort is found in
ponds, rice fields, from near sea level to 800 m, from Madagascar,
Tropical & Subtropical Asia to Caroline Islands. Flowering:
August-March.
Identification credit: Tabish
Photographed in Navi Mumbai, Maharashtra.
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The flower labeled Ribbed-Stem Pipewort is ...