1919.] NATURAL SCIENCES OF PHILADELPHIA. 251 



Corolla white, rather strongly inflated. Anther-sacs usually 



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 Hght violet-purple. Leaf- 

 blades lanceolate, sparsely serrate. 4. P. pefitstemon. 

 Calyx-lobes becoming 8-10 mm. long, equaling the 

 capsule. Corolla 25-35 mm. long, usually deeper 

 violet-purple. Leaf-blades broadly lanceolate, usu- 

 ally more serrate. 5. P. calycoms. 

 Corolla narrower, its throat within strongly two-ridged 

 anteriorly, and (at least in P. canescens) with narrow 

 sharply defined lines. Anther-sacs violet-purple. Ster- 

 ile filament slightly exserted, moderately bearded. 

 Stems more loosely puberulent. 

 Blades of the cauline leaves tapering from the broad 

 base, more serrate, glabrous or nearly so. Corolla, 

 "bright pink -purple." Capsule broadly ovoid. 



6. P. smallii. 

 Blades of the cauline leaves usually narrowed from 



above the narrower base, less serrate, more pubes- 

 cent. Corolla faint violet-purple, conspicuously 

 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 



very densely bearded. Plants lower. 

 Corolla 20-25 mm. long, broader, red-purple, throat deeply 

 lined within, white on anterior lobes within. Sterile 

 filament bearded with golden-yellow hairs. 



8. P. australis. 

 Corolla 25-30 mm. long, very narrow and slender, white 



throughout. Sterile filament bearded with lemon-yellow 

 hairs. 9. P. tenuiflorus. 



1. Penstemon dissectus Ell. 



Penstemon dissectus Ell., Sketch Bot. S. C. and Ga. 2: 129. 1822. "This 

 . . . species was sent me . . . from Louisville, Georgia, by 

 Mr. Jackson." Type seen in the Elliott Herbarium at the Charleston 

 Museum. 



Light gravelly 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 



