Home Flora of Panama (WFO)
Name Search
Markup OCR Documents
!Cyperus L. Search in The Plant ListSearch in IPNISearch in Australian Plant Name IndexSearch in Index Nominum Genericorum (ING)Search in NYBG Virtual HerbariumSearch in JSTOR Plant ScienceSearch in SEINetSearch in African Plants Database at Geneva Botanical GardenSearch in Flora do Brasil 2020Search in Reflora - Virtual HerbariumSearch in Living Collections Decrease font Increase font Restore font

Project Name Data (Last Modified On 10/23/2012)

Flora Data (Last Modified On 10/23/2012)
PlaceOfPublication Sp. P1. 44. 1753
Reference Kuekenthal, Pflanzenr. IV20:1-671. 1936.
Description Annuals or perennials, the culms simple, usually triangular and leafy; inflores- cence involucrate in dense spikes or in clusters, capitate or on rays which are often compound; spikelets flat or subterete, few- or many-flowered, the rachis often winged, the scales concave, 2-ranked; flowers perfect; perianth none; stamens 1-3; style 2- to 3-cleft; achene lenticular or 3-angulate.
Note About 600 species, chiefly in tropical regions.
Key a. Style 2-cleft. b. Surface of achene with vertically elongated cells. c. Cell margins whitened in age; scales 2 mm. long, yellow to light brown _ - - - -------- ---_ 1. C. FLAVESCENS cc. Cell margins not whitened in age; scales 1 mm. long, deep brown- 2. C. PICEUS bb. Surface of achene with quadrate cells, frequently with embossed or papillose centers. c. Spikelets 4-5 mm. wide - _ - _ --3. C. UNIOLOIDES cc. Spikelets 1-3 mm. wide. d. Spikelets greenish to yellowish-brown. e. Spikelets 1-1.5 mm. wide; dwarf annuals rarely taller than 10 cm. ------ - - - - - - - --- 5. C. POLYSTACHYUS ee. Spikelets 2-3 mm. wide; the scale margins strongly hyaline 4. C. ALBOMARGINATUS dd. Spikelets black to shining chestnut-brown; 2-3 mm. wide; the scale margins not strongly hyaline - _ -- 6. C. NIGER aa. Style 3-cleft. b. Culm terete, naked, usually over a meter high - _ _ - 15. C. GIGANTEUS bb. Culm more or less trigonous, leafy at least below. c. Decurrent scale bases (i.e. wings of the rachilla) becoming corky at maturity; the rachilla breaking into 1-fruited j - s 7. C. FERAX cc. Rachilla wings not becoming inflated and corky. d. Inflorescence of dense, rigid, cylindric spikes. e. Spikes usually sessile in a capitate inflorescence --.12. C. FLAVUS ee. Spikes digitately compound on long rays l- - 0. C. LIGULARIS dd. Inflorescence not of dense cylindric spikes. e. Spikes loosely cylindric, the spikelets readily falling at maturity. f. Scales with a long awn - - - _ - _ - _ 8. C. PANAMENSIS ff. Scales not awned. g. Spikes broader at base; achene oblong-elliptic ---13. C. HERMAPHRODITUS gg. Spikes not broader at base; achene linear-oblong -- 9. C. TENUIS ee. Inflorescence of globose heads or of flattened racemes. f. Spikelets small (2-5 mm. long), flattened, in dense glom- erulate clusters, mostly on short compound rays. g. Achenes yellowish-brown, 1 mm. long -----21. C. LUZULAE gg. Achenes brick-red, rough, 0.7 mm. long --- 22. C. SURINAMENSIS ff. Spikelets not glomerulate on compound rays. g. Spikelets quadrangular, in loose globular heads - 11. C. GLOBULOSUS gg. Spikelets flattened, in umbellate or racemose clusters. h. Ultimate clusters of spikelets forming simple umbels. i. Umbels sessile. j. Spikelets green--- - 17. C. COMPRESSUS jj. Spikelets white - -- - 20. C. TENERRIMUS ii. Umbels on rays. j. Rays short (up to 5 cm.). k. Spikelets brown - - __ - 24. C. HASPAN kk. Spikelets green --- - 17. C. COMPRESSUS jj. Rays long (mostly 10-20 cm.). k. Culrms shorter than the rays; stamen I - 23. C. SIMPLEX kk. Culms longer than the rays; stamens 2 or 3 25. C. DIFFUSUS hh. Ultimate clusters of spikelets racemose (i.e. axis of the cluster more or less elongate); inflorescence with prominent rays. i. Clusters narrow (4 to 5 times longer than broad); inflorescence elongate _ - -14. C. PROLIXUS ii. Clusters only slightly longer than broad; inflorescence not elongate. j. Spikelets purple to dark brown - -- 16. C. ROTUNDUS ij. Spikelets green, yellow, or yellow-brown. k. Spikelets dull green; rachilla not winged - 19. C. SPHACELATUS kk. Spikelets yellow to yellow-brown; achenes partly enclosed by the winged rachis - .18. C. ESCULENTUS
© 2017 Missouri Botanical Garden - 4344 Shaw Boulevard - Saint Louis, Missouri 63110