Cyperus conglomeratus Rottb.  

Tussocky, rhizomatous perennial, 4-40 cm tall. Rhizome short. Roots with sand-sheath.
Culms triangular or terete, usually + rigid, the bases covered with red to reddish, narrow
to wide leaf-sheath at and below the soil/sand level. Leaves as long as the stem; leaf-
sheath 1-12 cm long, narrow to brown, thickish but yet rather soft, the old disintegrating
into fibers; lamina channeled on the upper surface, tapering, often the lower part
becoming rigid, curved and persistent. Inflorescence usually a small anthelidium of
sessile spikelets or sometimes also with some peduncle spikelet clusters. Involucral
bracts leafy, 1-5, usually longer than inflorescence. Spikelets 7-20 (-30) x2-4 mm,
compressed to narrow and + terete, many-flowered, greyish to reddish brown. Glumes
2.5-4 mm long, boat-shaped, reddish on the inside, scarious-margined, mucronate.
Stamens 3. Stigmas 3. Nuts obovate, obscurely trigonous, up to c. 1.7 x 1.3 mm.
It is represented by 2 subspecies in Saudi Arabia
Subspecies conglomeratous is taller, the plants up to 30-40 cm tall, leaves not rigid-
curved, leaf-sheaths broad, red to reddish brown a little above and below the soil level,
Up to c. 12 em long. Inflorescence a small anthelidium or globose or anthelidium also
with some peduncled spikelet clusters.
Cyperus effusus Roub. (1772) is a small rigid selfe
up to c. 8 cm tall, with leaves rigid, curved, usually distichous and inflorescence a single
cluster of spikelets.
Saudi Arabia: Coastal areas and Red Sea Islands
Distribution:
Both subspecies extend from Western Rea Sea coast to coastal areas of Pakistan