62.
Cyperus
filiculmis
Vahl, Enum. Pl. 2: 328. 1805.
Cyperus martindalei Brittton
Herbs, perennial, cespitose, bases cormose; rhizomes knotted, beaded. Culms trigonous, 15—48 cm × 0.4—1 mm, glabrous. Leaves flat, 10—30 cm × 0.5—2 mm. Inflorescences: spikes rather densely ovoid, 1—3.5 cm; rays 0 (sometimes 1—4), 1—6 cm; rachis 1—4 mm; bracts 3—4, horizontal to slightly reflexed, flat, 6—25 cm; rachilla ± deciduous, wingless. Spikelets 25—60, compressed, oblong-lanceoloid, 5—12 × 2.2—3.5 mm; floral scales deciduous, 5—15, yellowish to yellowish brown, laterally 4—5-ribbed, oblong-ovate, 2.6—3.6 × 1.4—2 mm, margins loosely spreading or clasping achene. Flowers: anthers 0.8—1 mm; styles 1 mm; stigmas 1.5—2.5 mm. Achenes dark grayish brown, sessile, narrowly oblong, 1.8—2.2 × 0.5—0.8 mm, apex obtuse, apiculate, surfaces puncticulate.
Fruiting summer. Well-drained, open roadsides, fields, pine barrens, dunes; 0—200 m; Ala., Fla., Ga., La., Md., Miss., N.C., S.C., Tex., Va.
Cyperus filiculmis has long been treated within a broader and more widely used concept of C. filiculmis (C. lupulinus); see B. G. Marcks (1974)
