Steudel, Synops. Pl. glumac. 2:12 (1854).
Synonymy: Cyperus vaginatus
Common name: Spiny flat-sedge, spiny sedge.
Densely tufted perennial, with a short stout horizontal rhizome; stems erect or spreading, 15-70 cm long, cylindrical or somewhat trigonous particularly at the top, rather prominently and closely striate; leaves reduced to thin membranous sheaths; bracts mostly 3-6, sometimes longer than the inflorescence, usually less than 5 cm long, very rigid and pungent, the margins incurved.
Inflorescence a dense head or with 1-4 shortly pedunculate globose heads added (i.e. umbellate) often proliferous; spikelets very numerous (very rarely few) in the heads, 8-20-flowered, usually rich-brown or pallid, linear to lanceolateovate, acute, 3-5.5 mm long, 2.5-3 mm wide; rhachilla not winged; glumes tightly packed, with slightly spreading tips, acute in profile (thinner and less rigid than in C. vaginatus which they otherwise resemble), 3-nerved on the back and sometimes with 1 or 2 faint nerves on each side, shining, 2.5-3 mm long.
Nut ovoid or ellipsoid, acute, shortly cuneate to a wide base, 1-1.3 x c. 0.7 mm, trigonous, somewhat compressed, angles indistinctly ribbed and rather obtuse, sides convex, dark-brown, shiny base and tips ending in black points, about half as long as the glume; seed seldom produced.
Cunningham et al. (1982) Plants of western New South Wales, p. 161.
Grows in wet places.
S.Aust.: NW, LE, GT, FR, EA, EP, NL, MU, YP, SL, SE. All mainland States.
Flowering time: throughout the year.
SA Distribution Map based
on current data relating to
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