Pringle’s clustervine

Vines, perennial, or subshrubs. Herbage hairy, hairs stellate, 4–6-armed, arms spreading or porrect. Stems trailing, twining, or ± erect, to 4 m. Leaf blades broadly ovate or ovate, 15–30(–65) × 10–25(–48) mm, base shallowly cordate or truncate, apex usually acute, rarely ob­tuse. Inflorescences ± lax, 1–7-flowered, bracts linear. Flowers: sepals unequal, outers broadly ovate to suborbiculate, 5–9 mm, longer and wider than inners, base subcordate, apex acute, surfaces hairy; corolla white to pale blue or lavender, broadly funnelform, 20–25 mm, limb entire or 5-angled. Cap­sules broadly ovoid, 5–6 mm. Seeds 2–2.5 mm.

Flowering May–Jan. Oak woodlands, basalt hills, rocky cliffs; 1000–1500 m; Ariz.; Mexico (Sinaloa, Sonora); Central America.

Jacquemontia pringlei is endemic to the Sonoran Desert and reaches its northern limit of distribution in Pima County, Arizona; a report for Yuma County was evidently a mistake.