PENNELL—SCROPHULARIACEAE OF THE ROCKY MOUNTAINS. 338 
Plants essentially glabrous; leaves filiform or nearly so, closely tufted on abbreviated 
branches arising from the shortened caudex; corolla throat less inflated. 
Corolla throat evidently inflated, 9 to 10 mm. long, evidently 2-lipped, the pos- 
terior lobes 4 to 7 mm. long, the lobes spreading to a breadth of 10 to 15 mm., 
a anther sacs ovate-lanceolate; sterile filament —— bearded 
dorsal 54. exilifolius. 
Corolla eae slightly inflated, 10 to 12 mm. long, sligntly 2- =e ts ee 
lobes 3 to 4 mm. long, the lobes spreading to a breadth of less than 11 mm., 
light red-violet; anther sacs linear-lanceolate; sterile — slightly to 
moderately bearded dorsally P. laricifolius. 
XII. AMBIGUI. 
Asingle species 56. P. ambiguus. 
: XIII. DEUSTI. 
Asingle species 57. P. deustus. 
XIV. GRACILES. 
Corolla glabrous externally (rarely with a few glandless hairs distally). 
Sepals triangular, slightly scarious but nearly entire below, one-third to two-fifths 
the length of the capsule. Thyrsus of lax fascicles; flowers more distinctly 
pediceled ... 58. P. watsoni. 
Sepals long-acuminate to caudate-tipped, conspicuously scarious and more or less 
erose-lacerate below, at least one-half the length of the capsule. 
Corolla 8 to 10 mm. long, the throat 2 mm. wide. 
Calyx glabrous externally. 
ee —_ long caudate tip and with relatively slightly toothed scarious 
58.P procerus. 
Sepals eit short caudate tip and with ns more lacerate scarious 
margin 59a. P. procerus aberrans. 
Calyx pubescent externally 59b. P. procerus pulvereus, 
Corolla 10 to 18 mm. long, the throat 2.5 to 4 mm. wide. 
Corolla 10 to 14 mm. long, densely pubescent within, deep violet-blue; sepals 
with oe: pire broad, strongly lacerate margin below, and relatively 
shorter t ly congested..60. P. rydbergii. 
Corolla 15 e 18 mm. Tong, slightly to moderately pubescent within, lighter 
violet-blue; sepals with narrower, less lacerate margin below, and rela- 
tively longer tip, pubescent or glabrous; thyrsus less densely congested. 
61. P. aggregatus. 
Corolla glandular-puberulent externally. 
Corolla pale to deep blue, the throat 1.8 to 4 mm. wide; capsule lance-ovate, 5 to 
: mm. long; a erect, 10 to 80 cm. tall; thyrsus of many several-flowered 
cl 
Corolla deep or , oie blue, slightly paler anteriorly, the throat less strongly 
ridged within anteriorly and not apparently inflated posteriorly, the posterior 
lobes abruptly spreading and but little exceeded by the anterior ones; plants 
from cree stems. 
Corolla 15 to 20 mm. ee: stem puberulent in lines. Blades of basal leaves 
over 3 cm. long. 
Corolla 17 to 20 mm. long, deep blue, the throat slightly inflated; sepals 
3.5 to 7 mm. long, with broad and more or less lacerate scarious margin; 
ae leaves nearly always entire; thyrsus more crowded; plants paler 
62, P. pseudoprocerus. 
green 
