1919.] NATURAL SCIENCES OF PHILADELPHIA. 251 
Corolla white, rather strongly inflated. Anther-sacs eens 
barbate. Stem glabrous or nearly so......3. P. digitalis. 
Corolla more or less violet-purple, moderately inflated. An- 
ther-sacs glabrous. Stem usually puberulent. 
Corolla more open, its throat anteriorly shallowly two- 
ridged, and with broader less evident lines. Anther- 
sacs grayish. Sterile filament included, slightly 
bearded. Stem finely puberulent. 
Calyx-lobes becoming 4-7 mm. long, one-half to two- 
thirds the length of the capsule. Corolla 20-25 
(-28) mm. long, usually co violet-purple. Leaf- 
blades lanceolate, sparsely serrate. 4. P. pentstemon. 
Calyx-lobes becoming ae an long, equaling the 
capsule. Corolla 25-35 mm. long, usually deeper 
violet-purple. Die broadly lanceolate, usu- 
ally more serrate. 5. P. calycosus. 
Corolla narrower, its throat within strongly two-ridged 
anteriorly, and (at least in P. canescens) with narrow 
arply defined lines. Anther-sacs iclobs purple. Ster- 
ile filament slightly exserted, moderately bearded. 
tems more loosely puberulent. 
Blades of the cauline leaves tapering from the broad 
ase, more serrate, glabrous or nearly so. Corolla 
“bright pink-purple.”’ Capsule broadly ovoid. 
P. smaltiz. 
Blades of the cauline leaves usually narrowed from 
above the narrower base, less serrate, more pubes- 
cent. Corolla faint violet-purple, outs pleiotaly 
lined within throat. Capsule ovoid. 
7. P. canescens. 
Corolla with throat scarcely inflated, its mouth closed by the 
anterior lip, which rises as a convex arc. Sterile filament 
lined within, white anterior lobes within. Sterile 
filament bearded with ann ate 
. P. austr 
Corolla 25-30 mm. arrow and cae white 
throughout. Stesile ie lagoon henrded with lemon-yellow 
hairs. 9. P. tenuz 
1. Penstemon dissectus E 
Penstemon porn Ei, sorte — 8. C. grok Ga. 2: 129. = PE 
was sent uisville, 
Mr. Jackson, ” Type seen a5 “ Elliott Herbarium at he Ceadieion 
Muse 
Light pasa soil, rock-ledges, rock outcrops of Altamaha Grit, 
southern Georgia. 
Flowering in April and May, fruiting in June. Corolla violet. 
purple, externally slightly redder, paler on anterior side, within 
