2542 



PENTSTEMON 



PENTSTEMON 



HH. Infl. very open and loose, due to the fact that the 

 peduncles are 3-6 in. long and the pedicels 1 in. 

 or more long and the fls. drooping. 



25. rotundifdlius, Gray. Fig. 2863. About 2 ft. tall, 

 branching from the base, glaucous: lower Ivs. thick and 

 leathery, orbicular-ovate and obtuse, long-petipled, st.- 

 Ivs. sessile and cordate-orbicular: fls. 1-1 K m - l n g> 

 narrow-tubular, yellow-red, the lobes short and acute; 

 sterile filament glabrous. N. Mex. B.M. 7055. G.C. 

 III. 4:265. G.F. 1 :473 (reduced in Fig. 2863). 



GG. Lvs. serrate or dentate. 

 H. Sterile filament bearded at the tip or along one side 



(Nos. 26-32}. 



I. Color of fls. purple, blue or rose, sometimes ranging to 

 white. 



26. campanulatus, Willd. Branching from the base, 

 2 ft. or less tall : Ivs. lanceolate or the upper ones ovate- 

 lanceolate, long-acuminate, broad at the base and ses- 

 sile, strongly serrate: infl. long and narrow, the pedun- 

 cles usually 2-fld.; fls. 1 in. long, rose-purple or violet 

 (sometimes white in cult.), the corolla funnelfonn, the 

 lobes rounded and spreading and the lower lip broader 

 than the upper, the sterile filament hairy at the top. 

 Mex. and Guatemala. B.M. 3884. An old garden plant 

 which is variable in color and which has received many 

 names, as P. angustifolius, P. atropurpeus, P. roseus. 

 See B.R. 1122. L.B.C. 15:1429, 1438. G.C. III. 50:93 

 (a white form). P. pulchellus, Lindl., by some referred 

 here, is by others kept distinct, differing in corolla 

 abruptly ventricose or swollen above, violet or lilac 

 with white veins, the lips nearly equal, throat spotted 

 and villous, sterile filament bearded at end. Mex. 

 B.R. 1138. 



27. hftmilis, Nutt. Low, usually not over 6 in. tall, 

 pubescent in the infl.: Ivs. oblong to lanceolate, some- 

 what glaucous, the upper ones small-toothed: infl. 

 3-4 in. long, with 2-5-fld. peduncles; fls. ^in. long, 

 rather narrow, deep blue or sometimes ranging to white, 

 the lower lip bearded within. Rocky Mts., west. 



F. 1875:241. 



28. gracilis, Nutt. 

 Taller, sometimes 

 minutely puberu- 

 lent, slender: Ivs. 

 linear- lanceolate, 

 sometimes nearly 

 entire, the radical 

 ones spatulate or 

 oblong: infl. strict, 

 the peduncles 2- or 

 more-fld. ; fls. nearly 

 1 in. long, mostly 

 narrow-funnelform, 

 lilac - purple rang- 

 ing to white. Neb. 

 to Colo, and north- 

 ward, on moist 

 prairies. B.M. 2945. 

 L.B.C. 16:1541. 

 A pretty species. 



n. Color of fls. nearly 

 or quite white, 

 but sometimes 

 shaded with red 

 or purple. 



29. tubifldrus, 

 Nutt. St. 2-3 ft., 

 erect, not leafy 

 above : Ivs. oblong 

 to ovate-lanceolate, 

 barely serrulate, 

 passing into small 



2863. Pent stemon rot undifolius. (Xi4) bracts above: infl. 



of densely-fld., somewhat whorled clusters; fls. about 

 %in. long, scarcely 2-lipped, the spreading limb nearly 

 as long as the tube, white or nearly so and sometimes 

 tinged with purple. Mo., Kans., and Ark. 



30. laevigatus, Soland. (Chelone Pentstemon, Linn.). 

 Tall and slender, 2-4 ft., more or less glaucous: Ivs. 

 rather firm, purplish, somewhat glossy, ovate to ovate- 

 oblong-lanceolate and clasping, the radical ones 

 oblanceolate or broader, all small-toothed: infl. long and 

 loose; fls. about 1 in. long, white and sometimes tinged 

 with color, rather slender, narrow at the base, the short 

 lobes not wide-spreading, the small lower lip bearded 

 at the base. Pa., west and south. B.M. 1425. A com- 

 mon plant, best known in the following form. 



Var. Digitalis, Gray (P. Digitalis, Nutt. Chelone 

 Digitalis, Sweet). Very tall, 4-5 ft., with larger white 

 abruptly inflated fls. B.M. 2587. Sometimes becomes 

 a weed in old fields, from Maine south and west, but 

 probably not indigenous in all this range. It is in 

 cult., as a border plant. By some authors kept dis- 

 tinct as a species. P. Sm&llii, Heller, is a handsome 

 allied species from N. C. and Tenn., with bright pink- 

 purple gibbous corolla, pubescent or puberulent sts.: 

 root-lvs. oval or ovate; st.-lvs. lanceolate or ovate- 

 lanceolate, smooth both sides, serrate. 



31. Palmeri, Gray. Plant 2-3 ft. tall, the foliage 

 glaucous: Ivs. thick, ovate to oblong-lanceolate, the 

 lower petioled and the upper connate, very sharp-den- 

 tate or sometimes almost entire: infl. long, mostly 

 glandular; fls. cream-white tinted with pink, the narrow 

 part of the tube about as long as the calyx, the upper 

 part very wide and open, the mouth M m - across and 

 2-lipped; sterile filament yellow-bearded. Utah, south 

 and west. B.M. 6064. F.S. 20:2094. F. 1874:37. 



ra. Color of fls. red. 



32. Clevelandii, Gray. Two ft. or above, more or 

 less glaucous, becoming woody at the base: Ivs. rigid, 

 oblong or ovate, sharp-toothed, the upper ones usually 

 connate by their bases: infl. long and narrow; fls. %in. 

 long, crimson, with narrow throat; sterile filament 

 bearded at top. S. Calif, and Low. Calif. G.M. 36: 

 626. F. 1878, p. 149. 



HH. Sterile filament glabrous. 



33. deustus, Douglas. Sts. 1 ft. or less tall, from a 

 woody base, glabrous throughout: Ivs. thickish, vary- 

 ing from nearly linear to lanceolate to ovate, some or 

 all of them serrate, the uppermost sessile: infl. many- 

 fld., loose and open; fls. not over ^in. long, dull white 

 or yellowish white and sometimes tinged with purple, 

 wide-mouthed, the lobes wide-spreading. Mont, and 

 Wyo. to Calif. B.R. 1318. 



34. spectabilis, Thurb. Two to 4 ft., erect, some- 

 what glaucous: Ivs. ovate to ovate-lanceolate or some- 

 times oblong, acute, the upper ones acuminate and 

 connate by their bases, very sharp serrate-dentate: infl. 

 long and many-fld. ; fl. 1 in. or more long, rose-purple or 

 lilac, the narrow part of the tube about twice the length 

 of the calyx, the upper part broad and full, the lobes 

 rounded. New Mex. to S. Calif. B.M. 5260. A beau- 

 tiful species. 



EE. St. and Ivs. more or less pubescent or hirsute. 

 F. Corolla 2 in. long. 



35. Cobsea, Nutt. Fig. 2864. Straight and erect, 

 stout, about 2 ft., minutely pubescent: Ivs. thick, ovate- 

 oblong to oblong to broad-lanceolate, the upper ones 

 clasping: infl. mostly simple and open; fls. very large, 

 reddish purple to white, the base very narrow but the 

 upper part of the fl. broad and open, the limb only 

 obscurely 2-lipped; sterile filament bearded. Prairies, 

 Mo. and Neb., south. B.M. 3465. Gn. 49:406. G. 

 29:83. F.S.R.2, p. 271. Mn. 4:113. Very showy, and 

 probably one of the parents of the garden race of 

 hybrid pentstemons (see No. 13). 



