Hydrophyllum capitatum (ballhead waterleaf)

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Intermountain Flora
Plants 1-4 dm tall, loosely hirsute or partly strigose; stems solitary or few, delicately attached to the rather deep-seated and very short rhizome from which the cluster of fleshy-fibrous roots decends; leaves few and relatively large, long-petiolate, some of them attached below the ground, the blade sometimes 1 dm wide and nearly 1.5 dm long pinnatifid into 7-11 sessile leaflets, the upper confluent, the lower approximate or remote; leaflets acute to more often obtuse or rounded and mucronate, with rounded, entire margins, or commonly some of them with one or two large, obliquely forward-pointing, entire-margined lateral lobes, the central lobe sometimes also with one or two distal teeth; peduncles well surpassed by the leaves, seldom any of them over 5 cm long, often reflexed in fruit; corolla 5-9 mm long, white to more often lavender or purplish-blue; anthers 0.6-1.3 mm long; 2 n = 18.

Cronquist, A., Holmgren, A.H., Holmgren, N.H., Reveal, J.L., and Holmgren, P.K. (1984) "Intermountain Flora" pg.202, vol. 4, The New York Botanical Garden New York.