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| August 2008 at farm yard |
September 2007 at lowland swamp |
September 2007 at lowland swamp |
| 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 |
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| August 2008 at farm yard |
September 2007 at lowland swamp |
September 2007 at lowland swamp |
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| September 2007 at lowland swamp |
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| August 2006 at car park |
August 2006 at car park |
