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2-3 mm long 2-5 dm tall Achenes alluvial Apr-May ascending Aug-Sept axillary axils Basal leaves base beak Black Hills branched calyx Carex carpels cespitose clusters cm long cm wide Corolla culms cymes dense dm tall eastern elongate Flowers white Flowers yellow Frequent to common Fruiting capsules glabrous Glumes green hairs heads Inflorescence Involucral bracts July-Aug July-Sept June-Aug June-July Key to Genera l-2 cm long Leaf blades leaflets Leaves flat Leaves lanceolate Leaves linear Lemmas less lobed margins maturity May-June meters tall Michx Nutt oblanceolate oblong Ovary ovoid panicle pedicels peduncles Perianth Perigynia Perigynium petals Petals white petioled pink pinnately pinnatifid pistillate Plants annual Plants perennial prairie Principal leaves pubescent purple Pursh racemes Ray flowers rhizomes rich woods rootstocks Rydb sandy soil seeds segments sepals serrate sessile sheaths short slender solitary species Spikelets spreading Stamens stout surface tapering taproot terminal tips toothed umbels upper leaves usually waste places western