PENNELL—SCROPHULARIACEAE OF THE ROCKY MOUNTAINS. 335 
Corolla 15 to 20 mm. long, with narrow tube, less deeply 2-lipped. 
Leaves glabrate; calyx lobes less puberulent, scarious-margined. Stems 
usually more ascending, sometimes 10 cm. tall. 
Leaves obovate, obtusish; calyx lobes acute........ 74. P. suffrutescens. 
Leaves lanceolate, acute or acutish; calyx lobes acuminate....75. P. xylus. 
Leaves canescent; calyx lobes densely puberulent, not or scarcely scarious- 
margined. 
Leaves narrowly oblanceolate to obovate, reaching 1 to 2 cm. long; branches 
more ascending at apex, frequently 3 to 4 cm. tall. 
76. P. caespitosus. 
Leaves spatulate-obovate, mostly shorter; plant with branches scarcely 
ascending. .........-.--.---2-----+5- 76a. P. caespitosus perbrevis. 
Leaves linear or nearly so. Plants heathlike. 
Corolla 16 to 18 mm. long. 
Leaves canescent; calyx lobes densely puberulent, not or scarcely scarious-mar- 
gined; corolla more pubescent within..............--. 77. P. teucrioides. 
Leaves glabrous or nearly so; calyx lobes slightly puberulent, scarious-margined ; 
corolla usually less pubescent within............-.--- 78. P. glabrescens. 
Corolla 12 to 14 mm. long.........---.-- 22-222 e eee eee eee eee eee 79. P. abietinus. 
A single species. ............0 20-2 e eee eee eee eee ee eee eee 80. P. whippleanus. 
XVII. FRUTICOSI. 
Leaves ovate, dentate with spreading teeth, pubescent, 2 to 3 cm. long; sterile fila- 
ment 0.25 to 0.5 mm. wide, slightly lanose or glabrous distally. 
81. P. montanus. 
Leaves lanceolate, slightly dentate or entire, glabrous, 3 to 6 cm. long; sterile filament 
1 to 1.5 mm. wide, strongly lanose near the apex....-.... 82. P. fruticosus. 
XVIII. BRIDGESIANI. 
A single species. ......-- 2.2. - ee eee eee eee ee ee eee ence eee e reece 83. P. bridgesii. 
XIX. HETEROPHYLLI. 
Anthers purple; seeds 1.5 to 2 mm. long; sepals lanceolate, 5 to 8 mm. long; leaves 
lanceolate to ovate, 3 to 5 cm. long, green; stems puberulent. 
Corolla lavender-violet, 20 to 30 mm. long; anther sacs frequently more or less 
pubescent on the sides; leaves elliptic-ovate, 4 to 5 cm. long, usually conspicu- 
ously acuminate; plants 30 to 70 cm. tall.....-.--.-.-- 84. P. platyphyllus. 
Corolla violet-blue, 15 to 19 mm. long; anther sacs always glabrous on the sides; 
leaves lanceolate to oblanceolate, 3 to 5 cm. long, obtuse to acute or somewhat 
acuminate; plants 10 to 40 cm. tall........-.-.------+----- 85. P. leonardi. 
Anthers dark gray; seeds 2 to 3 mm. long; sepals rounded-ovate, 2 mm. long; leaves 
linear-lanceolate, 6 to 9 cm. long, glaucous; stems glabrous. Corolla violet, 25 to 
30 mm. long; plants 60 to 80 cm. tall.......-.----.--.--+-+-- 86. P. sepalulus. 
1. Penstemon eatoni A. Gray. 
Penstemon eatoni A. Gray, Proc. Amer. Acad. 8: 395, 1872. “Mr. Watson 
* * * in company with Professor Eaton, found it abundantly in Provo Canyon, 
Wasatch Mountains,’’ Utah. Isotype, S. Watson 776, collected in July, 1869, at 
1,800 meters altitude, seen in the herbarium of Columbia University, at the New 
York Botanical Garden. . 
