HINTONIORUM Turner, 1995

Type : Hinton et al. 23797, Nuevo León : Municipio Zaragoza, Cerro Viejo, 2085 m, 1 Oct 1993.

Distribution : Mexico (Nuevo León, Tamaulipas), growing on boulders in pine-oak woodlands, 1800 – 2100 m.

Description by B.L  Turner in Phytologia, 78(6): 405-406. 1995 :

Ascending to recumbent perennial herbs 15 – 20 cm high.

Roots forming fusiform tubers 1 – 2 cm long, 0.2 -0.5 cm across.

Lower stems suffruticose, glabrous, the empidermal cells elongate but bulging; upper stems and branches of inflorescence similar to the lower but upon drying seemingly winged, the uppermost portions appearing subpapillose.

Leaves alternate, oblanceolate, those at midstem ca 2 cm long, 0.4 cm wide, glabrous, smooth.

Flowers arranged in terminal, relatively open paniculate cymes 3 – 5 cm across and about as wide, or else arranged in leafy 1-sided flowering branches. Sepals 5, unequal, free, ovate-lanceolate to oblanceolate, 2 – 4 mm long, petals 5(-4), 4 – 6 mm long, 1 – 2 mm wide, broadly lanceolate, the upper portion often with a green or rosy mid-rib, the apices decidedly acute, reflexing at maturity. Nectaries much-reduced, reniform, white. Stamens ca 5 mm long, the anthers purple or purplish. Pistils 4 – 5 mm long, erect to somewhat spreadding at maturity, the beaks ca 1.5 mm long. Seeds ovoid, ca 0.7 mm long, brown, minutely papillose.

Sedum hintoniorum occurs in pine-oak woodlands from 1800 – 2100 m where it forms colonies on bare boulders or exposed rocky places. 

"It is compared to S. caducum in the protologue, which differs in stiffly erect and papillose stems, leaves speckled with red, and the cucullate petal tips" (U.Eggli in IHSP, p. 277, 2003)