Botanical name: Cyperus glomeratus Family: Cyperaceae (Sedge family)
Synonyms: Cyperus aureus, Cyperus semiradiciflorus, Cyperus sparsiflorus
Clustered Sedge is an annual herb with fibrous roots. Stems are scattered, 1-2 ft tall, stout, bluntly 3-angled, smooth, basally with leaves, base slightly swollen. Leaves are few, shorter to slightly longer than stem; sheath reddish brown, long. Leaves are 4-8 mm wide, margin smooth. Involucral bracts 3 or 4, leaflike, longer than inflorescence. Flowers are borne in a compound anthela; rays 3-8, mostly to 12 cm, unequal in length; raylets lacking. Spikes somewhat spherical, ellipsoid, or oblong, 1-3 x 0.6-1.7 cm, not stalked, with very many spikelets. Spikelets are very densely arranged in several rows, narrowly linear-ovoid to linear, 5-10 × 1.5-2 mm, slightly compressed, 8-16-flowered; rachilla wings white, narrow, hyaline. Nutlet are dark gray, narrowly oblong, about 1/2 as long as subtending glume, 3-sided, prominently netveinedly striped. Clustered Sedge is found in wet grasslands along trails, sandy soil at water margins, river margins, lake banks, paddy fields, at altitudes of 100-1300 m. Flowering: June-October.
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The flower labeled Clustered Sedge is ...