PLANT: Perennial herbs, 10–15(–50) cm tall, pilose throughout, with stolons and tubers; tubers round to ellipsoid, white to purple, up to 3 cm long. LEAVES: alternate, pinnately compound, usually about 7.5–22 cm long, 3.5–8 cm wide, more or less pubescent on upper and lower surfaces; leaflets (3–)5–7(–9), mostly less than 2 times longer than wide, with younger leaflets sometimes purple beneath; most distal lateral leaflets (1.5–)2.5–6.5 cm long, (0.5–)1.5–2.7(–3.5) cm wide, ovate to elliptic, with apex acute to acuminate, with base cuneate to rounded-oblique, often decurrent on rachis; terminal leaflet usually much larger than laterals, (1.8–)3.5–7.5(–10) cm long, (1.5–)2.5–4.5(–7) cm wide, elliptic to obovate, with apex acute to acuminate, with base cuneate; small interstitial leaflets sometimes present between the larger ones; petioles 1.5–4 cm long. INFLORESCENCE: racemose or paniculate cymes, lateral or pseudoterminal, 3–26-flowered, ebracteate, usually densely pilose and sometimes sparsely glandular; peduncles 3.4–10 cm long. FLOWERS: actinomorphic (Fig. 3G); pedicles 1–3.5 cm long; calyx 4–7(–30) mm long, with lobes 1–2 times as long as tube, ovate-lanceolate to triangular-lanceolate, acute to long-attenuate; corolla pentagonal-rotate, blue, purple or white and purpletinged, ca. 1.8–3.3 cm in diam., with lobes 1.5–4 mm long, edges of corolla flat; stamens equal, 3–6 mm long; anthers 2–4 times longer than filaments; style as long as stamens, or exceeding them by up to 4 mm. FRUITS: 0.9–1.7 cm in diam., not invested in calyx, white to deep green, sometimes with darker green stripes and white spots; seeds ovate in outline, green-white, ca. 2 mm long. NOTES: Open coniferous forest: Apache, Cochise, s Coconino, Gila, Graham, Greenlee, Pima, Pinal, Santa Cruz cos. (Fig. 2G); 1950–2750 m (6500–9000 ft), occasionally lower; late Jul–early Oct; NM, TX, s to Oax., Mex. One of the most common, widespread, and polymorphic species of the wild potatoes. Arizona populations tend to be of shorter stature and have fewer interstitial leaflets than in the southern part of its range. Tubers have been reportedly used as a food source by some Native American tribes. REFERENCES: Scott T. Bates, Frank Farruggia, Edward Gilbert, Raul Gutierrez, Darin Jenke, Elizabeth Makings, Erin Manton, Douglas Newton, and Leslie R. Landrum. Vascular Plants of Arizona: Solanaceae Part Two: Key to the genera and Solanum. CANOTIA 5(1):1-16.