Balsamorhiza sagittata, arrowleaf balsamroot

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Intermountain Flora
Perennial with a deep-seated, woody taproot and multicipital caudex; basal leaves long-petiolate, the blade mostly triangular-hasstate, or with more cordate base, up to 30 cm long and 15 cm wide, entire, silvery, especially beneath, with a fine close, felt-like tomentum of short hairs when young, greener and often glabrate in age; stems 2-8 dm tall, scapiform, but usualy with several strongly reduced narrow leaves; heads solitary; top of the peduncle and lower part of the involucre generally lanate-tomentose, rarely nearly glabrous; rays 8-25, commonly about 13 or about 21, 2.5-4 cm long; achenes glabrous; 2n = 38.

Cronquist, A., Holmgren, A.H., Holmgren, N.H., Reveal, J.L., and Holmgren, P.K. (1994) "Intermountain Flora" pg.20, vol. 5, The New York Botanical Garden New York.