Cyperus tenuispica
Content
Description
Annual with fibrous, reddish roots, or longer-lived in favourable circumstances.
Leaves flat, gradually acuminate, smooth or scaberulous at the top, flaccid, 2-4 mm wide;
Inflorescence compound or decompound, relatively large, loose, 3-10 cm across.
Stamens 1(-2);
Distribution
Asia-Temperate, Asia-Tropical: India present; Malaya (Peninsular Malaysia present); Philippines (Philippines present); Sulawesi (Sulawesi present); Sumatera (Sumatera present), Ceylon present, Farther India present, Java and adjacent islands present, Lesser Sunda Is present, Lombok present, Luzon present, Nepal present, S. Japan present, Timor present, Tropical Africa present, tropical Australia present, warm regions of the eastern hemisphere present
Widely distributed in the warm regions of the eastern hemisphere: tropical Africa, Ceylon, Nepal, India, Farther India, extending northward to China and S. Japan, southward to tropical Australia; in Malesia: Malay Peninsula (according to KÜKENTHAL, l.c.), Sumatra, Java and adjacent islands, Philippines (Luzon); a few times also collected in the Lesser Sunda Is. (Lombok, Timor) and Celebes.
Notes
Often overlooked by confusion with C. halpan, but well characterised by the small, obtuse, patulous glumes with excurved top, the rachilla soon visible from the outside, the smooth anthers, and the minute nuts.
CLARKE and KÜKENTHAL consider it to be always a very short-living plant soon becoming yellowish or blackish. Small specimens flowering and fruiting in a short time are indeed characteristic of the regularly cultivated rice-fields. In wet, grassy places, fallow fields, etc. the plants grow much larger and may live for a considerable time, just as is the case in C. halpan.
CLARKE and KÜKENTHAL consider it to be always a very short-living plant soon becoming yellowish or blackish. Small specimens flowering and fruiting in a short time are indeed characteristic of the regularly cultivated rice-fields. In wet, grassy places, fallow fields, etc. the plants grow much larger and may live for a considerable time, just as is the case in C. halpan.
Citation
STEUD. 1968 – In: Back. & Bakh.f., Fl. Java 3: 476
KERN 1952 – In: Reinwardtia: 116
Clarke 1907 – In: Philip. J. Sc.: Bot. 82
F.-VILL. & NAVES 1880 – In: Blanco, Fl. Filip., ed. 3, 4: 8
Clarke 1893 – In: Fl. Br. Ind.: 600
KÜK. 1936: p. 245. – In: Pfl. R.: f. 28 A-D
Merr. 1923 – In: En. Philip.: 105
STEUD. 1954 – In: Reinwardtia: 38
CAMUS 1912: p. 51. – In: Fl. Gén. I.-C.: f. 4, 12