Family: Cyperaceae
Isolepis
Citation:
R. Br., Prod. Fl. Nov. Holl. 221 (1810)
Derivation: Greek isos, equal; lepis scale; alluding to the glumes
Synonymy: Eligiton Link, Hort. Bot. Berol 1:284 (1827).
Common name: Club-rushes
Description:
Annual or slender perennial herbs; stems solitary or tufted or weakly creeping or floating; leaves with or without blades; inflorescence terminal on a usually nodeless scape but often appearing lateral; involucral bracts usually 1, stiff, erect and culm-like and continuing the stem.
Inflorescence a head of 1 to numerous spikelets; spikelets several-flowered, 2.5-6 mm long, oviod or oblong, angled or not; glumes spirally arranged around the rhachilla; flowers bisexual; stamens 1-3; style slender throughout, decidous, branches 2 or 3; hypogynous bristles 0.
Distribution:
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About 70 species especially in Africa and Australia.
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Biology:
No text
Taxonomic notes:
The descision to separate Isolepis from Scirpus and the key species are taken from K. Wilson(1981) Tleopea 2:153-172.
Key to Species:
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3. Glumes 1.8-2.7 mm long, green to straw-coloured at least in part |
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I. fluitans 4. |
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3. Glumes c. 3 mm long, usually a dark red-brown |
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I. producta 11. |
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2. Spikelets 3-12 in a cluster |
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I. inundata 7. |
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4. Plant with a long creeping rhizome. |
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5. Slender perennial with numerous spikelets clustered in a dense globose head |
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I. nodosa 9. |
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5. Small annual with 1 or 2 spikelets per inflorescence |
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I. subtilissima 13. |
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4. Plant tufted or with a shortly ascending rhizome. |
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6. Glumes with a narrow-attenuate portion as long as the broad base |
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I. hystrix 6. |
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6. Glumes lacking a long attenuate portion. |
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7. Nut longitudinally striate and transversely ridged |
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I. hookeriana 5. |
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7. Nut smooth or minutely blistered. |
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10. Nut dark-brown to black; spikelets 1 or rarely 2; glumes 1-1.5 mm long |
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I. platycarpa 10. |
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10. Nut straw-coloured; spikelets 1-3; glumes 0.8-1.2 mm long |
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I. australiensis 1. |
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I. cernua 2. |
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I. marginata 8. |
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I. congrua 3. |
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13. Glumes 0.8-1.2 mm long |
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I. australiensis 1. |
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14. Glumes with the broad keel produced into a stout mucro; spikelets usually 3 |
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I. stellata 12. |
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14. Glumes mucronulate or with the obvious keel not produced at all; spikelets 1-12. |
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15. Dried specimens not smelling like curry |
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I. inundata 7. |
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15. Dried specimens smelling like curry |
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Cyperus hamulosus 16. |
Author:
Not yet available
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