Pycreus

Pycreus

 

a genus of perennial and annual herbs of the family Cyperaceae. The bisexual flowers, which have no perianth, are gathered in elongated spikelets that form umbellate or capitate inflorescences. There are two stigmata. The nutlike fruit is laterally compressed, with the thin edge facing the axis of the spikelet. There are about 100 species, distributed in the tropical, subtropical, and—less frequently—temperate zones. About ten species are found in the USSR, growing primarily in southern regions. The plants grow along sandy and silty shores, along irrigation canals, in swampy meadows, and in other wet places. Particularly widespread is P. flavescens. P. globosus is found in the Caucasus and Middle Asia, and P. korshinskyi grows in the southern part of the Far East. Both are weeds in rice fields. Pycreus is sometimes included in the genus Cyperus.

References in periodicals archive ?
Haines & Lye, Lipocarpha R.Br., Oxycaryum Nees, Pycreus R Beauv., Queenslandiella Domin, Remirea Aubl., Sphaerocyperus Lye and Volkiella Merxm.
Amphiscirpus 1/0; Bolboschoenus 2/0; Bulbostylis 14/4; Calyptrocarya 1/0; Carex 124 (128)/51; Cladium 2/0; Cyperus 85 (88)/16 (17); Cypringlea 3/3; Eleocharis 49/12; Fimbristylis 14/3; Fuirena 7 (8)/2; Hypolytrum 1/0; Isolepis 2/0; Karinia 1/1 Kyllinga 3/0; Lipocarpha 5/0; Oxycaryum 1/0; Pycreus 9/1; Remirea 1/0; Rhynchospora 48 (52)/8; Schoenoplectiella 2/0; Schoenoplectus 5/0; Schoenus 1/0; Scirpus 3/0; Scleria 26/2; Uncinia 3/0
Tonduz 17469 Pycreus rivularis 1906-10-11 Oton Jimenez 75 Rhynchelytrum repens 1906-11-19 Oton Jimenez 58 Rhynchosia longeracemosa 1892-11-26 A.
Cyperus louisianensis Thieret is an obscure member of subgenus Pycreus. It was first described in 1977 and was previously thought to be endemic to two sites in southeastern Louisiana.
(2008), assessing the allelopathic potential from plant extracts, found that those from castor bean produced the largest reduction in germination and growth of Echinochloa crus-galli, Bidens tripartita, Pycreus sanguinolentus and Oriza sativa weed species, when compared to other plant extracts.
45434 22000 Pycreus propinquus Nees 45660 1300 Cyperaceae Cyperus uncinulatus Schrad ex Nees 45661 * Commelinaceae 11900 Commelina obliqua Vahl 45653 10100 Callisia repens L.
Pycreus rotundus (L.) Hayek, Cyperus tuberosus Roxn., Cyperus olivaris Targioni- Tozzetti Botanical name Parts used Abutilon indicum (L.) Root Sweet syn.
During restoration of mangrove swamps affected by oil spills and calcareous materials, aerobic fertilization allowed normal development of the red mangrove (Rhizophora mangle) and at least six associated species: Cyperaceae: Eleocharis mutata (L.) Romer et Schultes, Pycreus unioloides (R.
The distal parts of the spikelets of Scirpus sylvaticus, Fuirena ciliaris, Dulichium arundinaceum, Fimbristylis ferruginea, Scirpoides holoschoenus, Cyperus friburgensis, Pycreus pumilus, and of the spike and female spikelet of Uncinia rubra have an indeterminate axis apex (Fig.