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16. Pycreus P. Beauv., Fl. Oware. 2: 48. 1816; C.B.Clarke in Hook.f., Fl. Brit. Ind. 6: 589. 1993; Kukkonen in Rech.f., Fl. Iran. 173: 143. 1998.
Cyperus subg. Pycreus (P. Beauv.) C.B. Clarke, J. Linn. Soc. Bot. 21: 33. 1884.
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.
A genus with c. 70 species, distributed in tropical and warm areas; represented in Pakistan by 6 species.
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| 1 |
Plants loosely tufted or single; stem base decumbent, rooting at nodes; margins of glumes reddish or reddish brown. |
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1 P. sanguin |
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Plants tightly tufted; stem base erect; margins of glumes not reddish. |
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(2) |
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| 2 (2) |
Small annuals, up to 10 cm, stamens 1-2. |
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(2) |
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Tall annuals or perennials, up to 60 cm, stamens 2-3. |
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(3) |
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| 3 (2) |
Bracts up to 5 cm, nut 0.5-0.7 mm. |
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4 P. pumilus |
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Bracts up to 13 cm, nut c. 1.2 mm |
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5 P. dwarkensis |
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| 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. |
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3 P. polystachyos |
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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. |
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(5) |
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| 5 (4) |
Leaf blades 1-3 mm wide; bracts 1-2; nut 0.8-1 x 0.5-0.7 mm, finely reticulate, epidermal cells isodiametric. |
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2 P. flavidus |
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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. |
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6 P. flavescens |
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Lower Taxa
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