Amblyanthera foliosa Müller Arg., Linnaea 30: 427. 1860; Mandevilla stans (A. Gray) J. K. Williams; Trachelospermum stans A. Gray

Suffrutescent perennials [shrubs], 5–20 dm; rhizomes absent. Stems eglandular-pubescent to glabrate [gla­brous]. Leaves opposite [subopposite, whorled]; peti­ole 3–13(–18) mm, pubescent [glabrous]; blade ovate-lanceolate to elliptic or obovate, 50–130(–150) × 15–50(–70) mm, membranous, base cuneate, obtuse, or subcordate, margins not revolute, apex acute or acu­minate, surfaces eglandular-pubescent abaxially and at margins [glabrous], eglandular-pubescent to glabrate adaxially. Cymes 3–9(–14)-flowered. Peduncles 2–15 mm, pubescent [glabrous]. Pedicels 5–20 mm, pubescent [glabrous]. Flowers: sepals green, lanceolate to linear-lanceolate, (3–)5–8 × 1–1.3 mm, pubescent [glabrous]; corolla yellow, glabrous abaxially, eglandular-pubescent adaxially, tube 8–12 × 2–3 mm, throat 3–5 × 3–4 mm, lobes spreading, obliquely obovate to oblanceolate to dolabriform, often falcate, 6–10 × 3–4 mm. Follicles (55–)80–120 × 2–3 mm, pubescent or glabrate. Seeds 7–10 × 1.5–2 mm.

Flowering summer–fall; fruiting fall. Pine-juniper woodlands; 1700 m; Ariz.; Mexico.

Mandevilla foliosa is known in the United States from a single collection (Milson 1, ARIZ) in the Santa Rita Mountains in Santa Cruz County of southern Arizona but is widespread in Mexico.

J. K. Williams (2004c) referred populations of Mandevilla foliosa from northern Mexico to M. stans, arguing that the pubescence of stems, petioles, inflo­rescences, and sepals (versus glabrous in M. foliosa) and the disjunct geographic distribution (northern versus southern Mexico) were sufficient characters to justify recognition at the species level. This disposition was not followed in the most recent treatment of Mexican Mandevilla species (L. O. Alvarado-Cárdenas and J. F. Morales 2014).