: [Vor. 11 
144 ANNALS OF THE MISSOURI BOTANICAL GARDEN 
Chihuahua: Guayanopa Canyon, Sierra Madre Mts., 3600 ft. 
alt., 24 Sept., 1903, Jones (Pomona). 
Sinaloa: Sierra de los Alamos, 25 March-8 April, 1890, Edw. 
Palmer 828 (U. S.); high up in the Sierra de Alamos, 19 March, 
1910, Rose, Standley & Russell 18074 (U. S.) ; sandy soil along 
the river, near Fuerte, Sinaloa, 27 March, 1910, Rose, Standley 
& Russell 13381 (Т). S.). 
9. M. Nelsonii Grant! 
Stems more or less quadrangular, viscid-villous, erect and 
branched or somewhat procumbent; leaves elliptical or ovate- 
lanceolate, 3-8 cm. long, .7-2 em. wide, saliently toothed, sessile 
by а broad subcordate base, sparingly pubescent, 3-veined from 
the base; pedicels quadrangular, longer than the leaves; calyx 
broadly cylindrical, 3.4-3.7 em. long, pubescent, teeth unequal, 
triangular-acute, about one-third as long as the tube, the throat 
oblique; corolla 5-6.5 em. long, crimson, more or less shaded with 
yellow, the tube cylindrical, much exserted, throat ampliate, 
sparingly pubescent within, lobes of the upper lip longer, erect, 
almost truncate, those of the lower lip shorter and spreading, 
slightly emarginate; stamens exserted, attached near the base of 
the tube, filaments thin, broad, anthers horseshoe-shaped, villous; 
style included, shorter than the calyx, glabrous, stigma-lips 
truncate, slightly erose; capsule unknown. 
Distribution: known only from the type locality. 
Specimens examined: 
Mexico: 
Durango: Sierra Madre, 30 miles north of Guanaceri, 8000- 
9000 ft. alt., 18 Aug., 1898, Nelson 4775 (U. S. Nat. Herb., 
ТҮРЕ). | 
! M. Nelsonii is unique in this section on account of its unequal 
calyx-teeth and its short style. 
longa, ea, 
villosis; stylo calyce breviore.—Collected a: Я Nat. 
ceri, Durango, 8000-9000 ft. alt., 18 Aug., 1898, E. W. Nelson 4775 (U. 5. 
Herb., по. 332825, түрк). 
