MACDOUGALLII Moran, 1977
Type : MacDougall B.278, Cerro de la Flores, Oaxaca.
Distribution : Mexico (Oaxaca), dry slopes, ± 1500 m.
Description (by 't Hart & Bleij in IHSP, 2003) :
Glabrous perennial subshrubs with erect to ascending somewhat branched stems, to 50 cm tall.
Leaves alternate, crowded, cuneate-obovate, thick, obtuse, subterete to nearly flat, bluish-glaucous, 13 - 36 x 9 - 21 mm, flowering branches axillary, red, glaucous, 5 - 12 cm.
Inflorescences cymes with 3 - 10 ascending, simple or bifurcate branches, bracts similar to the leaves on flowering branches but slightly narrower, pedicels ± 1 mm.
Flowers 5-merous, sepals nearly free to the base, unequal, obovate, obtuse to rounded, glaucous, 1 - 2.5 x ± 1.5 mm, spreading, petals basally free, imbricate in bud, elliptic-ovate, obtuse, slightly carinate, shortly cucullate, slightly papillose along the dorsal keel, light yellow to greenish, ± 3 mm, filaments greenish-yellow, anthers yellow.
Cytology : 2n = 68