Pycreus polystachyos

Family	Cyperaceae
Scientific name	Pycreus polystachyos (Rottbøll) Palisot de Beauvois
Synonyms	Chlorocyperus polystachyos (Rottbøll) Rikli; Cyperus careyi Britton ex Small; Cyperus chlorostachys Boeckeler; Cyperus elongatus Steudel; Cyperus fascicularis Lamarck; Cyperus filicinus Vahl forma splendens Kükenthal; Cyperus filicinus Vahl var. microdontus (Torrey) Fernald; Cyperus fugax Liebmann; Cyperus gatesii Torrey; Cyperus hahnianus Boeckeler; Cyperus holosericeus Link; Cyperus inconspicuus Liebmann; Cyperus intactus Vahl; Cyperus liebmannii Steudel; Cyperus litos Schultes; Cyperus louisianae Steudel; Cyperus microdontus Torrey; Cyperus microdontus Torrey var. texensis Torrey; Cyperus olidus Vahl; Cyperus olivaceus Vahl; Cyperus paniculatus Rottbøll; Cyperus polystachyos Rottbøll; Cyperus polystachyos Rottbøll forma fugax (Liebmann) Kükenthal; Cyperus polystachyos Rottbøll forma glaucescens Boeckeler; Cyperus polystachyos Rottbøll forma inconspicuus (Liebmann) Kükenthal; Cyperus polystachyos Rottbøll subsp. holosericeus (Link) T. Koyama; Cyperus polystachyos Rottbøll var. chlorostachys (Boeckeler) Kükenthal; Cyperus polystachyos Rottbøll var. fascicularis (Lamarck) Kuntze; Cyperus polystachyos Rottbøll var. hahnianus (Boeckeler) Kükenthal; Cyperus polystachyos Rottbøll var. holosericeus (Link) C. B. Clarke; Cyperus polystachyos Rottbøll var. laxiflorus Bentham; Cyperus polystachyos Rottbøll var. leptostachyus Boeckeler; Cyperus polystachyos Rottbøll var. paniculatus (Rottbøll) C. B. Clarke; Cyperus polystachyos Rottbøll var. texensis (Torrey) Fernald; Cyperus scopellatus Richard; Cyperus sonderi J. A. Schmidt; Cyperus tenuis Muhlenberg; Cyperus teretifructus Steudel; Cyperus texensis (Torrey) Steudel; Cyperus vulgaris Kunth var. teretifructus (Steudel) Miquel; Pycreus fugax (Liebmann) C. Adams; Pycreus holosericeus (Link) Merrill; Pycreus odoratus Urban; Pycreus odoratus Urban var. hahnianus (Boeckeler) Stehlé; Pycreus paniculatus (Rottbøll) Nees von Esenbeck ex Alston; Pycreus polystachyos (Rottbøll) Palisot de Beauvois var. hahnianus (Boeckeler) C. B. Clarke; Pycreus polystachyos (Rottbøll) Palisot de Beauvois var. laxiflorus (Bentham) Ridley; Pycreus polystachyos (Rottbøll) Palisot de Beauvois var. paniculatus (Rottbøll) Donnell Smith
Common name	(Japanese common name) iga gayatsuri (イガガヤツリ, 毬蚊帳吊 [meaning: iga like mosquito net (iga = spinelike bracts of Castanea crenata)])
	(English common name) bunchy flat sedge, bunchy sedge, field sedge
Distribution	(Japan) Honshu (west of Kanto region), Shikoku, Kyushu
	(Other nations) worldwide
Habitat	Sand soil field or roadside (often near sea)
Chromosomal number	unknown
Description	Plants culms 10-40cm tall. Flowers spikelets 10-25mm long, 3 leaf like bracts, flowering in August to October. Perennial plants.
Reference	Pycreus polystachyos (Rottb.) P. Beauv.
	Pycreus polystachyos (Rottb.) P. Beauv
	Cyperus polystachyos Rottb.
	1,3-oxazin-4-one derivatives, herbicides containing the same, and novel intermediates for preparing the same (US Patent 5436224/1995)
Note	Common

August 2008 at farm yard	September 2007 at lowland swamp	September 2007 at lowland swamp

September 2007 at lowland swamp

August 2006 at car park	August 2006 at car park