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273a. Balsamorhiza Hooker ex Nuttall subg. Artorhiza (Nuttall) W. M. Sharp, Ann. Missouri Bot. Gard. 22: 115. 1935.
Balsamorhiza [unranked] Artorhiza Nuttall, Trans. Amer. Philos. Soc., n. s. 7: 350. 1840; Balsamorhiza sect. Artorhiza (Nuttall) Jepson
Taproots relatively massive; bark relatively thick, corrugated; rhizomes none; caudices usually multi-branched. Petioles mostly longer than leaf blades. Basal leaves: blades mostly rounded-deltate or deltate to triangular-deltate, bases sagittate or cordate to truncate, margins usually entire, sometimes crenate. Cauline leaves usually at mid stems. Ray corollas yellow.
Species 3 (3 in the flora): w North America.
Members of subg. Artorhiza inhabit relatively deep, well-developed soils, flower only after at least 4–5 years, and attain ages of possibly 50 years.
Lower Taxa
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