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ILLUSTRATIONS 1. Tuft of fibrous roots. 3 2. Rhizome. 3 3· Stolon. 3 4- Short, thick, subterranean crown. 3 5· Three-ranked leaves. 3 6. Bladeless sheath. 4 7· Ligule. 4 8. Solitary head. 4 g. Panicle. 4 10. Umbel. 4 11. Spike. 4 12. Involucra! bract. 5 13. Involucel. 5 14. Perfect sedge flower. 6 15. Achene on top of hypogynium in Scleria. 6 16. Achene enclosed in perigynium in Carex. 6 17. Spikelet several-flowered. 11 18. Spikelet 1-flowered in Cyperus densicaespitosus. 11 19. Achene without bristles in Cyperus. 11 20. Achene with bristles in Dulichium. 11 21. Achene with a tubercle. 12 22. Leaves absent in Eleocharis. 12 23. Leaves present in Bulbostylis. 12 24. Style of uniform thickness in Scirpus. 12 25. Style dilated toward base in Fimbristylis. 12 26. Rudimentary scales in Lipocarpha. 13 27. Ovate-oblong scales (behind achene) in Fuirena. 13 28. Bristles subtending achene in Rhynchospora. 13 29. Achene without bristles in Cladium. 14 30. Achene not in a perigynium in Scleria. 14 31. Achene in a perigynium in Carex. 14 32. Cyperus densicaespitosus. 19 33· Cyperus flavescens. 20 34· Cyperus diandrus. 23 35· Cyperus rivularis. 24 36. Cyperus filicinus. 26 37· Cyperus aristatus. 28 38. Cyperus pseudovegetus. 29 ix xI ILLUSTRATIONS 39· Cyperus acuminatus. 31 40· Cyperus ovularis. 32 41. Cyperus grayioides. 34 42. Cyperus compressus. 36 43· Cyperus schweinitzii. 38 44· Cyperus houghtonii. 39 45· Cyperus filiculmis var. filiculmis. 41 46. Cyperus filiculmis var. macilentus. 43 47· Cyperus erythrorhizos. 45

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