Cyperus polystachyos
Content
Description
Annual, or perennial with short rhizome;
Leaves weak to rather rigid, flat or canaliculate, gradually acuminate, scabrid on the margins in the upper part, (1-)2-4 mm wide;
Inflorescence simple or subcompound, strongly contracted (sometimes into a single head) to open, 2-15 cm across.
Stamens 2, very rarely in some or most flowers 1;
Distribution
Asia-Tropical, Australasia, Japan present, S. China present, warmer parts of the whole world, in the eastern hemisphere extending northward to the Mediterranean present
Widely spread in the warmer parts of the whole world, in the eastern hemisphere extending northward to the Mediterranean (see ), S. China, and Japan, southward to Australia; throughout Malesia, presumably common everywhere, though only a few times collected in the eastern part.
Notes
Very variable, especially as to the size and density of the inflorescence. The varieties based on this variability have little or no taxonomic value, as there exists every gradation from the single dense cluster of suberect spikelets to the open inflorescence with rectangularly spreading spikelets. Plants with open inflorescences are rather common in Malesia, especially near the sea. They have been described as: var. laxiflorus BENTH.
Citation
Ridl. 1925 – In: Fl. Mal. Pen. p 139
Clarke 1884: p. 51. – In: J. Linn. Soc. Bot. t. 3 f. 27
F.-VILL. & NAVES 1880 – In: Blanco, Fl. Filip., ed. 3, 4. p 10
BACK. 1949 – In: Bekn. Fl. Java, (em. ed.). fam. 246, p. 40
CAMUS 1912 – In: Fl. Gén. I.-C. p 34
STEUD. 1855 – In: Syn. p 3
Miq. 1856 – In: Fl. Ind. Bat. p 258
BOECK. 1868 – In: Linnaea. p 477
VALCK. SUR. 1898: Gesl. Cyp. Mai. Arch: 61. t. 2 f. 13
Benth. 1878 – In: Fl. Austr. p 261
Clarke 1893 – In: Fl. Br. Ind. p 592
Koord. 1911 – In: Exk. Fl. Java. p 186
ROTTB. 1773: Descr. & Ic: 39. t. 11 f. 1
HASSK. 1848: Pl. Jav. Rar. p 74
BEAUV. 1907 – In: Philip. J. Sc. Bot. 80
Ridl. 1907 – In: Mat. Fl. Mal. Pen. (Monoc.). p 60
KERN 1954 – In: Reinwardtia. p 48
KÜK. 1936 – In: Pfl. R. p 367
ROTTB. 1968 – In: Back. & Bakh.f., Fl. Java 3. p 472
Merr. 1923 – In: En. Philip. p 110
S. T. BLAKE 1947 – In: J. Arn. Arb. p 220