Passiflora mcvaughiana J. M. Mac Dougal

Slender, low-climbing or trailing, perennial vine 2–8 m long or more, sparsely pubescent with unicellular curved trichomes on petiole, leaf, stem, and stipule (rare), 0.3–0.6 mm long, 0.02 mm wide, also minutely antrorsely appressed-puberulent throughout (except ovary) with unicellular, curved trichomes, 0.1–0.3 mm long, 0.02–0.03 mm wide. Flowering stems 0.9–2.6 mm in diameter, terete or somewhat compressed, with the base woody and cork-covered. Stipules 3.8–7.5 mm long, 0.3–0.8 mm wide, narrowly ovate, acute to slightly attenuate, longitudinally striate-nerved; petioles 0.8–5.3 cm long, inserted 1.1–6.9 mm from the basal margins of the peltate blades, eglandular or very rarely with 1 or 2, round or elliptic, opposite to subopposite, sessile or shortly stipitate, discoid nectaries with flat rims, 0.8–1.3 mm wide (on the widest axis), 0.4–1.3 mm high, borne just below (rare) or in the distal half of the petiole (0.45–0.86 of the distance from the base toward the apex of the petiole). Laminas 0.9–7.3 cm long, 6.2–22.0 cm wide, coriaceous, occasionally variegated along primary veins, conspicuously peltate, transversely elliptic (widely divaricately bilobed), lateral lobes 3.1–12.0 cm long, 1.0–5.6 cm wide, elliptic, acute to slightly attenuate, central vein 0.7–6.8 cm long (measured from point of petiole insertion), angle between the lateral lobes 101–182(-190)°, ratio of lateral lobe to central vein length 1.15–4.57, margins entire, hyaline, primary veins 3, diverging and branching above base, laminar nectaries absent, associated with the minor veins of the abaxial surface, 0.8–1.1 mm in diameter, sessile; tendril 0.3–1.0 mm wide, present at flowering node, absent in inflorescence. Flowers borne in leaf axils or rarely in inflorescences; inflorescences 2.5–5.8 cm long, associated reduced laminas 1.3–2.3 mm long, 0.5–1.0 mm wide. Pedicels 5.6–25.0 mm long, 0.3–0.6 mm wide, (1-)2 per node; bract(s) absent or with one or two, narrowly ovate, acute bracts, 1.1–1.2 mm long, 0.1 mm wide, the bracts ca. 3.7 mm from base of peduncle; spur(s) absent. Flowers 15.0–25.3 mm in diameter with stipe 3.1–9.0 mm long, 0.5–0.7 mm wide; hypanthium 5.0–8.3 mm in diameter; sepals 6.7–8.5 mm long, 3.3–5.6 mm wide, ovate-triangular, acute, abaxially and adaxially greenish yellow, reflexed at anthesis; coronal filaments in 2 series, the outer 31–36, 3.1–7.1 mm long, 0.3–0.7 mm wide, linear to slightly narrowly obovate, erect, dull purple (5P 4/6) at base, yellow at tips, ratio of outer coronal row to sepal length 0.41–0.89, the inner 40–60, 1.3–2.9 mm long, 0.1–0.3 mm wide, linear, capitate, erect, greenish yellow speckled with dull purple, ratio of inner coronal row to outer coronal row length 0.20–0.56; operculum 1.0–1.8 mm long, plicate, whitish green, the margin with narrow minutely fimbrillate teeth; nectary 0.2–1.1 mm high, 0.6–1.0 mm wide; limen inclined away from androgynophore, 0.2–0.7 mm high, 0.2–0.5 mm wide, whitish green, speckled with purple, limen floor 2.5–4.9 mm in diameter, whitish green, speckled with purple; androgynophore 1.5–4.7 mm long, 0.9–1.3 mm wide; free portions of the staminal filaments 2.1–3.3 mm long, 0.4–0.8 mm wide, linear, greenish yellow anthers 1.7–3.2 mm long, 0.7–1.7 mm wide, greenish yellow with a dark purple edge; styles 2.7–4.9 mm long including stigmas, 0.3–0.5 mm wide, greenish yellow; stigmas 0.6–1.3 mm in diameter; ovary 1.3–3.6 mm long, 1.1–3.0 mm wide, widely ellipsoid to ovoid, greenish yellow. Berry 10.0–14.4 mm long, 12.8–13.8 mm in diameter, globose, very dark purple. Seeds (2-)6–11, 4.8–5.5 mm long, 3.6–4.1 mm wide, 2.1–2.7 mm thick, widely elliptic to widely obovate in outline, obtuse at both ends, reticulate-foveate with each face marked with 15–22 foveae.

Mexico, in the states of Jalisco, Mexico, and Guerrero. Pine and oak forests (bosque de pino y encino) or montane mesophytic forests (bosque mesófilo de montaña); growing in trees and on the steep banks of canals (barrancas) or streams, and moist hillsides; 1100–2000 m.