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1 Lowest pistillate bract auriculate but not sheathing; terminal spike normally staminate (rarely with a few perigynia terminally); leaf blades 1-2 mm wide; basal sheaths purplish or red; [of cliffs and rock outcrops at moderate to high elevations in the Mountains] | |
1 Lowest pistillate bract sheathing (the sheath short in C. prasina); terminal spike normally gynecandrous, rarely merely staminate (often merely staminate in C. prasina); leaf blades 1.5-7 mm wide; basal sheaths purplish or red (brownish or greenish in C. prasina); [of various habitats, only rarely as above]. | |
5 Perigynia 2.5-3.0 mm long, 0.9-1.2 mm wide; perigynium beaks absent or very short, the orifice entire; leaf blades1.5-2.5 mm wide | |
5 Perigynia 3.0-6.0 mm long, 1.4-2.0 mm wide; perigynium beaks very short to short, the orifice bidentate; leaf blades 2-6 mm wide. | |
6 Perigynia 3.5-6.0 mm long, 1.75-2.5 mm wide; leaves 3-8 mm wide. | |
8 All spikes gynecandrous, the lateral spikes with at least 1 staminate flower at base; peduncles longer than the pistillate spikes | |
8 Only the terminal spike gynecandrous, the lateral pistillate; peduncles shorter than the pistillate spikes |