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 Eatont, Gray, Proc. Am. Acad. 8, p. 395 (P. centranthi- 
Jolius, Watson, Bot. King, p. 219, not Benth).—Utah; Belmont, Nev., 1871, 
1872, Watson’s Report. 
Pentstemon Wricutst, Hook. (Watson, J. c. p. 453).—Utah, 1871, 
1872, Watson’s Report. 
PENTSTEMON viIRGATUS, Gray (Watson, J. c. p 453).—Neutria, N. 
Mex., at 7,100 feet elevation, July, 1874, Rothrock (150.)—Arizona, Roth- 
rock (264). 
PentTsTeMon AmBicuus, 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, 1. ¢ 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 
