328 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
Plants 10 to 30 cm. tall; basal and lower leaves oblanceolate to obovate, acutish, 
the upper leaves lanceolate; calyx lobes acute to acuminate, with narrow, 
scarcely erose, scarious margins; corolla 15 to 20 mm. long; sterile filament 
bearded. 
Calyx lobes acute; anther sacs glabrous; sterile filament moderately bearded. 
8. P. leptanthus. 
Calyx lobes acuminate; anther sacs barbate; sterile filament but slightly bearded. 
9. P. fremontii. 
VI. CRISTATI. 
Anther sacs opening nearly throughout, the line of contact of the sacs short; basal 
and lower leaves linear to linear-lanceolate; sterile filament densely bearded 
throughout with orange-golden hairs; seeds blackish. 
Corolla 20 to 25 mm. long, much more than twice exceeding the sepals; stems 
relatively stout. ...........000. 2.0 c cece ee cee eee e eect eeee 10. P. auriberbis. 
Corolla 12 mm. long, much less than twice exceeding the sepals; stems slender. 
11. P. parviflorus. 
Anther sacs opening throughout, the line of contact of the sacs longer; basal and 
lower leaves lanceolate to ovate; sterile filament bearded, especially distally, 
with yellow hairs; seeds brown. 
Corolla throat moderately (i. e., less abruptly) inflated, slightly pubescent to gla- 
brous within anteriorly, all the lobes spreading; anther sacs with moderate line 
of contact; sterile filament bearded with short hairs, rarely slightly exserted. 
Inflorescence, stems (throughout), and calyx cinereous-puberulent but not glandu- 
lar; plants 2 to 10 cm. tall; basal leaves 1.2 to 3cm. long....12. P. dolius. 
Inflorescence, stems (above), and calyx glandular-pubescent; plants taller; 
basal leaves 3 to 6 cm. long. 
Basal leaves lanceolate; stem leaves narrowed to a clasping base; corolla 18 
to 22 mm. long; anther sacs oblong-lanceolate, with medium line of con- 
tact; plants 8 to 16 cm. tall..............0.2.2.22.... 13. P. paysonii. 
Basal leaves ovate; stem leaves cordate-clasping at base; corolla 15 to 17 mm. 
long; anther sacs ovate, with longer line of contact; plants 10 to 40 cm. 
tall... eee eee eee wee eee eee e ee cece eee 14, P. moffatti. 
Corolla throat abruptly and strongly inflated, lanose within anteriorly, the posterior 
lobes arched and projecting forward (not spreading); anther sacs with long line 
of contact; sterile filament bearded with long hairs, usually exserted. 
Corolla throat not contracted distally, the lobes one-fourth to one-third the total 
length; anther sacs with line of contact nearly equaling the length of each. 
Corolla 20 to 35 mm. long, the throat very widely inflated, the lobes one-third 
the corolla length; basal leaves ovate, rough-puberulent, more or less lanate- 
pubescent; stem (above) and sepals white-lanate with gland-tipped hairs. 
Stem leaves lanceolate, entire or nearly so; corolla 25 to 35 mm. long. 
15. P. eriantherus. 
Stem leaves lanceolate-linear, more or less dentate with salient teeth; co- 
rolla 20 to 28 mm. long................ 15a. P. eriantherus saliens. 
Corolla 15 to 20 mm. long, the throat less inflated, the lobes one-fourth the 
corolla length; basal leaves lanceolate, roughish-puberulent to glabrate; 
stem (above) and sepals puberulent with gland-tipped hairs. 
16. P. ophianthus. 
Corolla throat obviously contracted distally, the lobes one-fifth the corolla length; 
anther sacs with line of contact longer than the length of each. 
17. P. cleburnei. 
VII. PETIOLATI. 
A single species. ...... 2.2.0... 22. cece eee eee e cece eee e cee cee 18. P. petiolatus. 
