116 



Corolla white, rather strongly inflated. Anther-sacs 



usually barbate. Stem glabrous or nearly so. 2. P. Digitalis. 



Corolla light violet-purple, moderately inflated. Anther- 

 sacs glabrous. Stem puberulent. 3. P. Pentstemon. 

 Corolla with throat scarcely inflated, its mouth closed by the 

 anterior lip, which closes as a convex arc. Sterile fila- 

 ment very densely bearded. Calyx-lobes ovate. 

 Plants lower, the stem pubescent or hirsute. 



Corolla 15-20 mm. long, white with violet lines. Anther- 

 sacs oval. Calyx-lobes obtuse to short-acuminate. 

 Stem and leaves soft-canescent. Leaves lanceolate. 4. P. pallidas. 



Corolla 23-28 mm. long, lavender-purple, unlined. An- 

 ther-sacs triangular-orbicular. Calyx-lobes acumi- 

 nate to caudate. Stem and frequently midrib of 

 leaves beneath more or less lanose-hirsute. Leaves 

 lanceolate-attenuate. 5. P. hirsntus. 



i. Penstemon tubiflorus Nutt. 



Flowering in June. 



Fields, seen only from Spring Valley, Rockland Co., N. Y. 

 Introduced from the southwestern Mississippi Valley. 



2. Penstemon digitalis Nutt. 



Flowering from mid-June to early July, fruiting in late August 

 and September. 



Fields and meadows, frequent above Fall-line. Introduced 

 from the southwestern Mississippi Valley. 



3. Penstemon pentstemon (L.) MacMillan. 

 Flowering in June and July. 



Fields and meadows, seen only from Rockland Co., New York 

 and Bergen and Gloucester counties, New Jersey. Introduced 

 from the South Atlantic states. 



4. Penstemon pallidus Small, Fl. S. E. Un. St. 1060, 1337. 



1903. 

 "Type, Bedford, N. Y., Britton, June, 1900, in Herb. N. Y. 

 B. G." Type seen; also the plant re-collected and 

 studied at the type-station. 

 Flowering from mid-May to late June. 



Sandy or barren soil, occasional, mostly above the Fall-Line. 

 Certainly introduced from the central Mississippi Valley. 



5. Penstemon hirsutus (L.) Willd. 



Chelone hirsuta L., Sp. PI. 611. 1753. "Habitat in Vir- 



