360 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
natus Dougl.). Isotypes in herbarium of Missouri Botanical Garden and U. 8. 
National Herbarium. 
Dry hills and mesas, at altitudes of 1,800 to 2,100 meters; Upper Sonoran Zone; 
flowering in late May and early June. Valleys of the San Juan and Dolores rivers, 
southwestern Colorado and southeastern Utah. 
Cotorapo: Archuleta: Arboles, Baker 596 (M, U, ut Montezuma: Mancos, 
Eastwood (Y). Montrose: N atria: Payson 340 (F, M 
“Uran: San Juan: Monticello, Rydberg & Garrett 9209, in sali (Y). 
47. Penstemon pachyphyllus A. Gray. 
Pens nitidus major Benth. in DC. Prodr. 10: 323. 1846. ‘‘In montibus 
Scopulosis (Frémont!). (v. in herb. Torrey.).’’ Type, from ‘‘Hillsides of Du Chene 
Fork,”’ Wasatch County, Utah, collected, in flower, May 31, 1844, by J. C. Frémont 
(Second Expedition, no. 485), seen in herbarium of Columbia University at the 
New i Botanical Garden. Type bears also the annotation “‘‘P. pachyphyllus’ 
Gray mss 
Pens denon acuminatus congestus Jones, Proc. Calif. Acad. IT, 5: 714. 1895. “‘[M. 
E. Jones] no. 5262. May 19, 1894, near Canaan Ranch, Utah, 5,000° alt., in 
sand.’’ Jones 5262, seen only in the herbarium of the iiscouri Botanical Garden, 
includes specimens of two species, P. laevis and P. pachyphyllus. The latter, fitting 
the description and being the same as the other collections cited, is taken as typical. 
Penstemon pachyphyllus A, Gray; Rydb. Fl: Rocky Mts. 770, 1066. 1917. Based 
upon P. nitidus major Benth 
Stems several, 30 to 60 cm. tall, from a short branched caudex, glabrous, pale or 
bluish glaucous; leaves strongly thickened, pale green, glaucous, in age evidently 
reticulate-veined, glabrous, those at the base of the stem with oval obtuse (with a 
mucro) blades 5 to 7 cm. long, narrowed into strongly margined petioles 3 to 5 cm. 
long, those of the stem clasping (bases of opposite leaves meeting around stem), 
lanceolate-oval to ovate, mostly 3 to 5 cm. long, 2 to 4 cm. wide; thyrsus narrowly 
elongate, one-third to one-half the height of the plant, composed of 5 to 10 fascicles, 
each consisting of 2 short axillary branches, their pedicels shorter or longer than the 
peduncle; sepals 5 mm. long, ovate, acute, fine-ribbed, with evident white to pink- 
ish, slightly sinuate, scarious margin, glabrous; corolla 15 to 18 mm. long, the tube 
and throat 10 to 12 mm. long, the throat somewhat inflated and rounded ventrally, 
the 2 posterior lobes 5 to 6 mm. long, united and arched one-third their length, the 
3 anterior lobes slightly longer, 4 to 5 mm. wide, united at base, all free portions 
widely spreading; corolla externally glabrous, within 1 anate-pubescent over the 
base of the anterior lobes, glabrous elsewhere, blue or bluish (not seen fresh); anther 
sacs widely divaricate (explanate), 1 to 1.2 mm. long, oblong, distinct, with rela- 
tively long line of contact, opening from the distal apex throughout the suture, 
glabrous; sterile filament 10 to 12 mm. long, slightly exserted, flat, slightly enlarged 
, at apex, densely bearded on the posterior fice distally with appar- 
ently dull yellow hairs; capsule 10 to 14 mm. long, ovate, acuminate, glabrous, pale 
brown; seeds 2 to 3 mm. long, thick-crescentic, curved in outline, the angles sharp, 
semiwinged, the surface alveolate-reticulate, cinnamon-brown, glistening. 
Loamy sagebrush slopes, at altitudes of 1,500 to 2,600 meters; Upper Sonoran and 
Submontane zones; flowering from late May to late June. Colorado Valley from 
Duchesne River southward to northern Arizona 
Uran: Beaver: Frisco, Jones 1812 (F, Y). Carbon: Helper, Pennell 6143 (H, U, Y); 
Price, Pennell 6145 (P, Y). Sevier: Near Richfield, Ward 166 (U); head of 
Salina yon, Jones 544lai (M, R, Y). Wasatch: ‘‘Hillsides of Du Chene 
Fork,” Frémont 485 (Y). Washington: Near Canaan Ranch (near Rockville), 
Jones 5262, in part (M), 
