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Key to Amphiachyris

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1 Plants typically 20-40 cm tall; leaves 0.2-1 (-2) mm wide; flowering heads arranged in open panicles (heads sometimes borne singly at branch apices); cypselae 4-6 ribbed
1 Plants typically 30-100 cm tall; leaves 0.5-6 mm wide; flowering heads arranged in dense corymbs; cypselae 7-9 ribbed