Volume 6 > Part 4 > Year 1998 > Page 360 > Cyperaceae > Cyperus

17. Cyperus procerus Rottb.wfo-0000380345

Descr. & Icon. Rar. Nov. Pl. 29, t. 5, f. 3. 1773; C.B.Clarke in Hook.f., Fl. Br. Ind. 6: 610. 1893; Camus in Fl. Gén. I.-C. 7: 62. 1912; Ridl., Fl. Malay Penins. 5: 147. 1925; Kük. in Engl., Pflanzenr. 4(20), 101 Heft: 91. 1935; J.Kern, Reinwardtia 6: 54. 1961; in Fl. Males., Ser. 1, Spermat. 7: 611, f. 51. 1974; T.Koyama in Gard. Bull. Singapore 30: 136, f. 4. 1977; Hô, Câyco Viêtnam III. 2: 675. 1993. Fig. 25: A–E.

Accepted Name : This is currently accepted.

Synonyms & Citations :

Description : Stoloniferous perennial. Culms 1-few, 50–100(–150) cm by 4–7(–10) mm, smooth, triquetrous. Leaves: blade linear, up to 60–150 cm by 7–10(–15) mm, long-acute, often subtriquetrous toward apex, canaliculate; sheath 8–28 cm long, pale greenish to purplish brown. Involucral bracts 3–4, the longest 20–70 cm long. Inflorescence simple to compound, rather open, 10–15 cm by 8–12 cm; primary branches 3–7, 6–15(–20) cm long; secondary branches up to 2 cm long or spikes sometimes solitary. Spikes broadly ovoid, 2–4 cm long; axis 2–3 cm long, scabrid. Spikelets 4–8 per spike, rather distant, patent to spreading, oblong to linear-lanceolate, 5–18 by 2.5–3.5 mm, flattened; axis straight. Glumes 9 or more on the longest spikelets, oval or ovate, 2.5–3 by 2–2.2 mm, sides membranous, 5–7-nerved, pale brown to reddish brown, margins broadly white-hyaline near apex, keel obtuse, reddish brown, smooth. Stamens 3; anthers 1.2–1.8 mm long. Stigmas 3. Nutlets ellipsoid, trigonous, 1.3–1.5 by 0.6–0.8 mm, maturing dark brown, ± smooth.

Thailand : NORTHERN: Phayao (Chun), Phitsanulok (Thung Salaeng Luang); NORTH-EASTERN: Khon Kaen (Khao Suan Kwang, Nam Pung, Pra That Khon Kaen); EASTERN: Chaiyaphum; CENTRAL: Krung Thep Maha Nakhon (Bangkok); SOUTH-EASTERN: Chachoengsao (Phanom Sarakhan); PENINSULAR: Phuket (Kopah, Ko Yao Yai), Narathiwat (Ban Ka Pong Ba Ru).

Distribution : Madagascar, India (type), Sri Lanka, Indochina, SE China, Taiwan, Malesia, Australia (Queensland).

Ecology : Open, swamps and wet places, sometimes in brackish marshes, 0–50 m alt.

Vernacular : Kok ta krap (กกตะกรับ), ya ta krap (หญ้าตะกรับ)(Central).

Notes: This species is stoloniferous and has spike axes which are scabrid.