Amsonia brevifolia A. Gray

Plants significantly hetero­phyl­lous. Stem leaves: petiole 1.5–5 mm; blade ovate to lan­ce­o­late (narrowly elliptic to ellip­tic), (2–)3–5.3 cm × (6–)8–27 mm, base convex (often attenuate basally) to rounded or cuneate. Branch leaf blades lanceolate to narrowly elliptic, 2.2–3.7 cm × 4–13 mm. Corolla lobes white to bluish, pinkish, or purplish white (blue to pink in bud) or pale blue to blue. 2n = 22.

Flowering spring; fruiting late spring–summer. Sandy washes, deserts, rocky slopes and gullies, limestone or granitic alluvial fans; 600–1900 m; Ariz., Calif., Nev.

Variety tomentosa is known from a relatively cohesive region that includes the northwestern to north-central quarter of Arizona, southeastern Nevada, and three neighboring counties of southeastern California.