Fimbristylis squarrosa var. esquarrosa Makino

Annual with fibrous roots. Stems slender, densely tufted, setaceous, compressed-subtrigonous, smooth, 10-25 cm by ½-1 mm. Leaves shorter than the stems, very narrow, flat or canaliculate, acute, more or less soft-hairy at least on the sheaths, ⅓-1 mm wide; ligule absent. Inflorescence compound or decompound, loose, with several to many spikelets, 2-5 cm long. Involucral bracts 3-7, dilated at the base, soft-hairy, the lowest shorter than to about as long as the inflorescence. Primary rays up to 6, slender, filiform, smooth, up to 2½ cm. Spikelets solitary, lanceolate, angular, acute, rather densely many-flowered, stramineous or ferrugineous, 4-7 by 1-1½ mm; rachilla narrowly winged. Glumes spiral, thinly membranous, suberect, ovate, or oblong-ovate, acutish, acutely keeled, 3-nerved, with nerveless sides, and a strong midnerve excurrent in a straight or slightly excurved, up to ⅓ mm long mucro, glabrous or pubescent, 1½-2 by 1 mm. Stamen 1; anther oblong, ¼-⅓ mm. Style slender, flat, not hyaline-margined, dilated at the base, sparsely ciliate at the top, ¾-1 mm, the lower margin fringed with a whorl of long, pendent hairs closely appressed to the nut and covering ½-¾ of it; stigmas 2, shorter than the style. Nut biconvex, with acute edges, obovate, shortly stipitate, minutely umbonulate, smooth, obscurely reticulate by the not impressed, hexagonal epidermal cells, shining stramineous, 3/5-¾ by ½ mm.

Shores of lakes, on wet sandy soil, on Mt Patuha at 1600 m, along Toba Lake at c. 900 m.