Cyperus strigosus false nutsedge Cyperaceae CYST; Bx, pb, wv; NY; Q; a, cu, cr, j, lk, wl; K, fs; R, bd, bm, lp, w;


Cyperus strigosus.© Les Mehrhoff, 2008-2010 ·

Cyperus strigosus.© Les Mehrhoff, 2008-2010 · (Accessed 4/2015).

Cyperus strigosus roots. MBGargiullo. Alley Pond Pk., Queens, NYC.8.25.98_Fotor

Cyperus strigosus roots. MBGargiullo. Alley Pond Pk., Queens, NYC.8.25.98

Cyperus strigosus is a short-lived perennial C4 sedge (Li et al. 1999), superficially like C. esculentus but from a bulbous, corm-like, dark, often reddish base, roots fibrous, very fine, matted (no tubers or rhizomes), base leafy, stem 10-60 cm, smooth, 3-sided, dark green, lustrous, leaf sheaths and backs of leaves often rather waxy pale green. 

Leaves 0.2-1 cm wide, as long as flowering stems; inflorescence bracts 2-7, leafy, much longer than stems. 

Flower spikelets yellowish, 4-14 flowered, flattened, 0.5-1.8 cm long, scales whitish to yellowish with green midrib, spreading at right angles along a narrowly winged axis 0.6-2.5 cm long, 0.1-0.2 cm wide; achenes 3-sided, linear less than half the length of its scale; inflorescence of few to many short-cylindrical, bottle-brush shaped spikes, mostly branched at base, central spikes stalkless, longer stalks 3-40 cm.

Fruit an achene; blooms and fruits Aug-Oct. Seeds eaten by many birds (Martin et al. 1951). 

Wetland status: FACW. 

Frequency in NYC: Occasional (probably more frequent than shown by inventory). 

Origin: Native. 

Habitat: Open or partly shaded, wet areas, disturbed sites, fill, moderately tolerant of fire, intolerant of shade, salt, soil pH 6.4-7 (USDA, NRCS 2010).