Cle des especes :
1. Prolongement cylindrique du lobule égal au 1/3 ou au 1/4 de la longueur totale de la feuille; feuilles longues de 0,5-1 mm. ; périanthe à 5 cornes (+ ailes) étalées ou dressées.
2. Cellules foliaires planes ou un peu bombées mais non papilleuses, à parois minces. C.calyptrifolia.
2. Cellules foliaires papilleuses a parois soit regulierement epaissies, soit minces mais munies de trigones.
3. Cellules à paroi externe fortement convexe (grosse papille arrondie), parois régulierement épaissies C. junghuniana.
3. Cellules à paroi externe conique (papille saillante), parois minces à trigones forts. C. berghellii.
1. .Prolongement cylindrique du lobule égal ou presqae égal à la moitié de la longueur totale de la feuille ; feuilles longues de 1-2,2 mm. ; périanthe à 5 cornes très courtes ou longues.
4. Feuilles longues de 1,7-2,2 mm. ; cellules foliaires souvent longuement rectangulaires; périanthe portant 5 prolongements très courts C. rhynchophora
4. Feuilles longues de 1-1,5 mm. ; cellules foliaires presque toutes carrées ou hexagonales ou faiblement rectangulaires; périanthe portant
5 cornes courtes ou longues.
5. Périanthe portant 5 cornes longues et étroites, subcylindriques C. tenuicornis.
5. Périanthe portant 5 cornes courtes, obtuses, coniques C. humbertii.
Key species:1. cylindrical extension of the lobule equal to 1/3 or 1/4 of the total length of the leaf; long sheets of 0, 5-1 mm. ; Perianth in 5 horns (+ wings) spread out and upright.2 leaf cells flat or slightly curved but not papillose, thin-walled. C.calyptrifolia.2 leaf cells papillose wall either regularly thickened, or thin but equipped with a Trine.3 external-walled cells strongly convex (large papilla rounded), walls regularly thickened v. junghuniana.3-walled cells external conical (protruding papilla), thin-walled to strong trigons. C. berghellii.1. Cylindrical extension of the equal lobule or presqae equal to half of the total length of the leaf; long leaves of 1-2, 2 mm. ; Perianth in 5 very short or long horns.4 1 long leaves, 7-2, 2 mm. ; leaf cells often long rectangular; Perianth with 5 very short extensions v. rhynchophora4 long leaves of 1-1,5 mm. ; leaf cells almost all square or hexagonal or low rectangular; bearing perianth5 horns short or long.5. perianth with 5 horns long and narrow, subcylindric c. tenuicornis.5 perianth with 5 horns short, blunt, conical v. humbertii.
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key to the species.1. the cylindrical extension of the lobule is equal to 1 / 3 or 1 / 4 of the total length of the leaf. leaves 0.5 to 1 mm long. perianth horns (+ 5, wings spread and developed.2. flat or slightly curved leaf cells but not papillose, thin walls. c.calyptrifolia.2. leaf cell walls epaissies papillose or regularly, but with trigones thin.3. cells in the outer wall strongly convex (a large rounded walls thickened more regularly. junghuniana).3. the external wall (conical papilla cells projecting to trigones), thin wall high. c. berghellii.1. a cylindrical extension of lobule. presqae equal or equal to half of the total length of the paper sheet 1 and 2.2 mm long. perianth 5 horns, short or long.4. 1.7 - 2.2 mm long leaf. often long rectangular; leaf cell; perianth with 5 rhynchophora short extensions.4. leaves 1 - 1.5 mm long. almost all; leaf cells (square or hexagonal or rectangular; perianth with5. shorter or longer.5. perianth with five horns are long and narrow, thick subcylindric c. tenuicornis.5. perianth 5 horns on short, obtuse. humbertii conical.
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