CATALOGUE. 211 



enlarged below the middle ; anthers glabrous or very minutely puberulent ; 

 sterile filament dilated at the apex, bearded or smooth. — Arizona?, 1873, 

 Loew (159 a); South Park, Colorado, August, 1873, Wolf (300); Mount 

 Graham, Arizona, at 9,250 feet elevation, August, 1874, Rothrock (400). 



Pentstemon Eatoni, Gray, Proc. Am. Acad. 8, p. 395 (P. centranthi- 

 folius, Watson, Bot. King, p. 219, not Benth).— Utah ; Belmont, Nev., 1871, 

 1872, Watson's Report. 



Pentstemon Wkightii, Hook. (Watson, I c. p. 453). — Utah, 1871, 

 1872, Watson's Report. 



Pentstemon virgatus, Gray (Watson, I c. p 453). — Neutria, N. 

 Mex., at 7,100 feet elevation, July, 1874, Rothrock (150.)— Arizona, Roth- 

 rock (264). 



Pentstemon ambiguus, Torr. (Ann. N. Y. Lye. 2, p. 228; Marcy's Rep. 

 p. 279, t. 16). — Glabrous, 1 to 2 feet high, paniculately branching from a 

 woody base ; lower leaves linear, attenuated below, upper ones subulate- 

 filiform or acerose-subulate ; racemes loosely flowered ; peduncles opposite ; 

 corolla scarcely bilabiate, 5 to 8 lines long ; tube 6 lines long, little dilated 

 above, often incurved, the spreading limb 6 lines in diameter ; sterile fila- 

 ments glabrous. — Western New Mexico and Eastern Arizona, 1873, Loew 

 (688, 860) ; Algodones, N. Mex, at 6,000 feet elevation, June, 1874, Roth- 

 rock (79) ; Camp Grant, August, 1874, Rothrock (440). 



Pentstemon linarioides, Gray (Proc. Am. Acad. 6, p 66). — Minutely 

 pruinose-puberulent ; stems 6 to 18 inches high, many, from a woody base, 

 very leafy ; leaves 1 inch long or- less, spatulate-linear to subulate ; pedun- 

 cles and pedicels short, alternate ; panicle narrow, sub-secund ; corolla 

 purplish, short-bilabiate, over £ an inch long, much dilated above ; palate 

 and sterile filament bearded — Arizona, 1871, 1872, Watson's Report; 

 "Tanks," south of Camp Apache, July, 1874, Rothrock (265). 



Pentstemon albidus, Nutt (Gray, /. c p. 67) — Stem puberulent, 6 

 to 9 inches high ; lower leaves petioled, oblong, obtuse, sub-entire, upper 

 ones serrate, lanceolate, glabrous or puberulent; thyrsus oblong, subver- 

 ticillately interrupted; cymes subsessile, few- flowered; sepals lanceolate, 

 very viscid-pubescent ; tube of the corolla widened above, three-fourths of 



