Common Spike-rush - Eleocharis palustris subsp. waltersii
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Species Description
Stace 4:
Eleocharis palustris ssp. waltersii Bureš & Danihelka (ssp. vulgaris Walters nom. illeg.).
Spikelets usually with <40 flowers; glumes from middle of spikelet 3.5-4.5mm; nut (1.3)1.5-2mm; stomata (50)54-70(77)μm; 2n=37, 38. Frequent throughout British Isles. Probably derved from crosses between ssp. palustris and E. uniglumis.