SCROPHULARINEA. 443 
* 
CANADA and OreEGon to FLORIDA and Anizoxa.—Norra Mexico, within the old boun- 
dary on Mount Graham, at 9250 feet (Rothrock). 
Typical S. nodosa has a wide range in Europe and Asia. 
10. PENTSTEMON. 
Pentstemon, Mitchell in Act. Phys. Med. Acad. Nat. Cur. viii. p. 214 (Penstemon) ; Benth. et Hook. 
Gen. Plant. ii. p. 940. 
With the exception of one species in North-east Asia, this is an exclusively North- 
American genus, chiefly western, including Mexico. About seventy herbaceous and 
half-shrubby species are known. 
1. Pentstemon acuminatus, Dougl.; Bot. Reg. t. 1285; DC. Prodr. x. p. 323; 
A. Gr. Synop. Fl. N. Am. ii. p. 264. : 
Pentstemon fendleri, A. Gr. in Pacif. Railr. Rep. i1. p. 168, t. 5. 
SASKATCHEWAN and Upper Missouri to the interior of OREGON, and southward to 
New Mexico and Trexas.—Norta Mexico, Chihuahua (Potts, Wislizenus). Hb. Kew. 
2. Pentstemon ambiguus, Torr. in Ann. Lyc. N. York, ii. p. 228, et in Marcy’s 
Rep. t. 16; A. Gr. in Proc. Am. Acad. vi. p. 64, et Synop. Fl. N. Am. ii. p. 270. 
CoLorapo and Utan to Arizona and New Mexico.—NortH Mexico, Chihuahua 
(Thurber). 
6. thurberi, A..Gr. in Proc. Am. Acad. vi. p. 65, et Synop. Fl. N. Am. ii. p. 270. 
Pentstemon thurberi, Torr. in Pacif. Railr. Rep. vii. p. 15 (species). 
Uran; Arizona; New Mexico.—Norta Mexico, Sonora (Thurber), Chihuahua 
(Wislizenus). 
3. Pentstemon baccharifolius, Hook. Bot. Mag. t. 4627; A.Gr.in Proc. Am. 
Acad. vi. p. 58, et Synop. Fl. N. Am. ii. p. 251. 
TEXAS. 
p. schaffneri, Hemsley. 
Fere glaber, foliis integris vel plus minus dentatis, foribus numerosioribus, pedicellis brevioribus 
calycibusque vix glandulosis. 
Norra Mexico, valley of San Luis Potosi (Schaffner, 751; Parry & Palmer, 666). 
Hb. Kew. 
We at first regarded this as a distinct species, as the first specimens we saw had quite 
entire leaves and almost perfectly glabrous inflorescences ; but among copious specimens 
collected by Schaffner were some with the leaves almost as distinctly toothed as in 
some of the Texan specimens, and the pedicels and calyces slightly glandular-hairy. 
4. Pentstemon barbatus, Nutt. Gen. Am. Pl. ii. p. 53; DC. Prodr. x. p. 329; 
A. Gr. in Proc. Am. Acad. vi. p. 59; Synop. Fl. N. Am. ii. p. 261; Bot. Reg. xxv. t. 21. 
Chelone barbata, Cav. Ic. Pl. iii. t. 242; Bot. Reg. t. 116. 
Chelone ruellioides, Andr. Bot. Rep. t. 34. 
31 2 
