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| 1 (1) |
Spikes gynecandrous, i.e. male flowers in basal parts of spikes. |
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(1) |
| + |
Spikes androgynous, i.e. male flowers in distal part of spikes. |
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(2) |
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| 2 (1) |
Bracts conspicuous, at least the lowest longer than inflorescence. |
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17 C. remota |
| + |
Bracts not foliose, short and narrow. |
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16 C. canescens |
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| 3 (3) |
Inflorescence with several foliose bracts. |
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(3) |
| + |
Bracts glume-like, or lowest occasionally foliose. |
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(4) |
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| 4 (3) |
Several bracts or at least the lowest longer than inflorescence. |
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12 C. nubigena |
| + |
Lower spikes with filiform bracts, longer than their spikes; stem sharply trigonous, sides concave. |
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5 C. otrubae |
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| 5 (5) |
Inflorescence elongated; spikes mostly remote or several lower not or barely overlapping. |
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(5) |
| + |
Inflorescence condensed; all spikes overlapping. |
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(6) |
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| 6 (5) |
Plants forming tight tufts; inflorescence finally brown; utricles 2-3mm; utricle base conspicuously suberous. |
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9 C. diandra |
| + |
Plants not in tight tufts; inflorescence finally green, yellowish or pale brown; utricle base not conspicuously suberous. |
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(7) |
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| 7 (6) |
Utricles 2.7-3.3 mm; ligule c. 0.5 mm, in lower part of inflorescence elongated branches with 2-4 spikes. |
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8 C. foliosa |
| + |
Utricles 3.3-5.4 mm, ligule 0.1-0.2 mm, in lower part of inflorescence not so, or at most, one elongated branch with more than one spike. |
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7 C. divulsa |
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| 8 (8) |
Arch of ligule about as high as wide |
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(8) |
| + |
Ligule not or at most only slightly arched. |
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(9) |
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| 9 (8) |
Robust plants, stem 2-3 mm in diam.; leaves 2.5-3.5 mm wide; utricles with 5-9 sturdy, dark veins on back side. |
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10 C. pycnostachya |
| + |
Plants rather slender, stem 1-1.5 mm in diam.; leaves 1-3 mm wide; utricles without conspicuous dark veins. |
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11 C. divisa |
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| 10 |
Utricles rounded, much inflated, to 25 mm; nuts 2.7-3.1 mm; plants of semi-desert. |
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13 C. physodes |
| + |
Utricles plano-convex, not inflated, up to 5 mm; nuts 1.5-2.2 mm; plants of semi-desert or mountains. |
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(11) |
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| 11 (10) |
+ Small plants of semi-desert, stem 0.5-1 mm in diam., terete or obtusely trigonous; leaves 0.5-2 mm wide. |
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14 C. stenophylla |
| + |
Tall or small mountain plants, stem 1-2 mm in diam., trigonous; leaves 1-3.5 mm wide. |
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(12) |
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| 12 (11) |
Rhizomatous plants, 5-20 cm; upper leaf surface papillose. |
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15 C. pseudofoetida |
| + |
Caespitose plants, 40-90 cm; ciliate at margins only on upper leaf surface. |
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6 C. vulpinaris |
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