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Published In: Flore d'Oware 2: 48. 1816. (Fl. Oware) Name publication detail

Project Name Data (Last Modified On 6/2/2011)
Acceptance : Accepted
Project Data     (Last Modified On 6/3/2011)
Synonym Text: Cyperus subg. Pycreus (P. Beauv.) C.B. Clarke, J. Linn. Soc. Bot. 21: 33. 1884.
General/Distribution: A genus with c. 70 species, distributed in tropical and warm areas; represented in Pakistan by 6 species.


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Annuals, occasionally perennials, 4-65 cm; caespitose, or basal internodes elongated and rooting; rhizome, when present, short, stoloniferous. Stem 0.3-2.5 mm diam., trigonous above. Leaves from 1/2 of stem length to much exceeding it, sheaths 15-50 mm; ligule 0; blades 7-20 cm, 1.5-3 mm wide. Inflorescence from a single cluster of digitate spikes to small anthelodium, elongate primary branches 0-4, 15-50 mm; cluster of spikes with 3 - 100 spikes, 15-30 mm, 1-4 foliose bracts up to 15 cm long; spikes 4-30 x 1-3 mm, rachis nearly quadrangular, with or without wings, with 8-40 glumes; stamens 1-2, stigmas 2; nut lenticular, edge towards rachis.

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1 Plants loosely tufted or single; stem base decumbent, rooting at nodes; margins of glumes reddish or reddish brown.
+ Plants tightly tufted; stem base erect; margins of glumes not reddish. (2)
2 (1) Small annuals, up to 10 cm, stamens 1-2. (2)
+ Tall annuals or perennials, up to 60 cm, stamens 2-3. (3)
3 (2) Bracts up to 5 cm, nut 0.5-0.7 mm. 4 Pycreus pumilus
+ Bracts up to 13 cm, nut c. 1.2 mm 5 Pycreus dwarkensis
4 Spikes in tight clusters, 1-1.5 mm wide, erect; bracts 3-4, 2-4 mm wide; nut 0.9-1 x 0.3-0.4 mm. 3 Pycreus polystachyos
+ Spikes in loose clusters, 2-2.5 mm wide, spreading; bracts 1-3, 0.5-2 mm wide; nut 0.8-1 x 0.5-0.8 mm. (5)
5 (4) Leaf blades (0.5-)1-2 mm; bracts 2-3; nut 0.8-1 x 0.6-0.8 mm, rugulose with transverse wavy lines, epidermal cells longitudinally elongated. 6 Pycreus flavescens
+ Leaf blades 1-3 mm wide; bracts 1-2; nut 0.8-1 x 0.5-0.7 mm, finely reticulate, epidermal cells isodiametric. 2 Pycreus flavidus
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