
Appearance
''Osmorhiza occidentalis'' is an erect perennial herb up sometimes exceeding 1 metre tall.The green leaves have blades up to 20 centimeters long which are divided into toothed and irregularly cut leaflets. The blade is borne on a long petiole.
The inflorescence is a compound umbel of many tiny yellowish flowers at the tip of a stemlike peduncle. The fruit is elongated and narrow, up to 2.2 centimeters long.
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