Phacelia linearis, threadleaf scorpionweed

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Intermountain Flora
Erect annual, 1-5 dm tall, simple or freely branched but with a definite central axis, the stem densely puberulent, the leaves often more strigose; leaves cauline, sessile or short-petiolate, narrow, mostly 1.5-11 cm long, 1.5-12 mm wide (exclusive of the 1-4 divergent, narrow segments that some of them may bear below the middle), generally more than 4 times as long as wide (exclusive of any lateral lobes); flowers crowded into elongating, helicoid cymes from the upper (and sometimes middle) axils; calyx cleft virtually to the base, its segments narrow, elongate, bristly-ciliate, growing with and surpassing the capsule, eventually 8-15 mm long, corolla rather showy, blue-lavender, very broadly campanulate, the broad, rounded-truncate lobes about half as long as the undivided portion, the limb 8-18 mm wide; filaments sparsely bearded, about equaling the corolla as pressed, evidently esposed in life; style 4.5-8 mm long, entire to well above the middle; ovules mostly 10-20 or reputedly up tp 40; capsule 6-10 mm long, acuminate; seeds mostly 6-16, dark brown to black, coarsely alveolate-reticulate or pitted-reticulate, 1-1.8 mm long; 2n = 22.

Cronquist, A., Holmgren, A.H., Holmgren, N.H., Reveal, J.L., and Holmgren, P.K. (1984) "Intermountain Flora" pg.163, vol. 4, The New York Botanical Garden New York.