1270 



PENTSTEMON 



PENTSTEMON 



calyx, the upper part broad and ventricose, the sub- 

 equal lobes rounded and spreading, the throat hairy; 

 sterile filament hairy at the top. Mex. B.M. 3884. An 

 old garden plant which is variable in color and which 

 has received many names, as P. angustifolius , atro- 

 purpureus, pulchellus , roseus. See B.R. 13:1122 and 

 14:1138. L.B.C. 15:1429, 1438. 



20. humilis, Nutt. Low, usually not over 6 in. tall, 

 pubescent in the inflorescence: Ivs. oblong to lanceo- 

 late, somewhat glaucous, the upper ones small-toothed: 

 inflorescence 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. 



21. gracilis, Nutt. Taller, some- 

 times minutely puberulent, slen- 

 der : Ivs. linear-lanceolate, some- 

 times nearly entire, the radical 

 ones spatulate or oblong: inflores- 

 cence strict, the peduncles 2- or 

 more-fld. : fls. nearly 1 in. long, 

 mostly narrow-funnelform, lilac- 

 purple ranging to white. Colo, and 

 Wyo., north. B.M. 2945. L.B.C. 

 16: 1541. -Pretty species. 



ii. Color of fls. nearly or quite 

 white, but sometimes shaded 

 with red or purple. 



22. tubifldrus, Nutt. Stem 2-3 ft., 

 erect, not leafy above: Ivs. oblong 

 to ovate-lanceolate, barely serru- 

 late, passing into small bracts 

 above : inflorescence of densely- 

 fld., somewhat whorled clusters: 

 fls. about % in. long, scarcely 2- 



1715. Beard-tongue Pentstemon laevigatus, var. Digitalis (X 34). 



spreading, the small lower lip bearded at the base. Pa., 

 west and south. B.M. 1425. A common plant, best 

 known in the form 



Var. Digitalis, Gray (P. Digitalis, Nutt.). Fig. 

 1715. Very tall, 4-5 ft., with larger white abruptly in- 

 flated flowers. B.M. 2587. Sometimes becomes a weed 

 in old fields. It is in ciiltivation as a border plant. 



24. 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 : inflorescence 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 % in. across and 2-lipped; sterile fila- 

 ment yellow-bearded. Utah, south and west. 

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



in. Color of flowers red. 



25. Cleveland!, Gray. Two ft. or more, 

 more or less glaucous, becoming woody at 

 the base: Ivs. rigid, oblong or ovate, sharp- 

 toothed, the upper ones usually connate by 

 their bases: inflorescence long and narrow: 

 fls. % in. long, crimson, with narrow throat; 

 sterile filament bearded at top. S. Calif. 

 G.M. 36:626. F. 1878, p. 149. 



HH. Sterile filament glabrous. 



26. deustus, Dougl. Stems 1 ft. or less tall 

 from a woody base, glabrous throughout: Ivs. 

 thickish, varying from nearly linear to lance- 

 olate to ovate, some or all of them serrate, the 

 uppermost sessile: inflorescence 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. Montana to Calif . B.R. 16: 

 1318. 



27. spectabilis, Thurber. Two-4 ft., erect, 

 somewhat glaucous: Ivs. ovate to ovate-lan- 

 ceolate or sometimes oblong, acute, the up- 

 per ones acuminate and connate by their 

 bases, very sharp serrate-dentate : inflores- 

 cence 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. N. Mex. to S. Calif. B.M. 5260. 

 A beautiful species. 



BE. Stem and Ivs. more or less 

 pubescent or hirsute. 

 p. Corolla 2 in. long. 



28. Cobaea, Nutt. Fig. 1716. 

 Straight and erect, stout, about 

 2 ft., minutely pubescent: Ivs. 

 thick, ovate-oblong to oblong to 

 broad-lanceolate, the upper ones 

 clasping: inflorescence mostly 

 simple and open: fls. very large, 

 reddish purple to white, the 

 base very narrow but the upper 

 part of the flower broad and 

 open, the limb only obscurely 2- 

 lipped; sterile filament bearded. 

 Prairies, Kans., south. B.M. 

 3465. Gn. 49:1068. Mn. 4:113. 

 Very showy, and probably one 

 of the parents of the garden 

 race of hybrid Pentstemons. 



lipped, the spreading limb nearly as long as the tube, 

 white or nearly so and sometimes tinged with purple. 

 Kans. and Ark. 



23. laevigatus, Solander. Tall and slender, 2-4 ft., 

 more or less glaucous: Ivs. rather firm, purplish, some 

 what glossy, ovate to ovate-oblong-lanceolate and clasp- 

 ing, the radical ones oblanceolate or broader, all small- 

 toothed: inflorescence 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- 



FF. Corolla 1 in. or less long. 



29. cristatus, Nutt. Only a few inches high, pubes- 

 cent, usually viscid above: Ivs. linear-lanceolate to nar- 

 row-oblong: inflorescence erect, leafy below: fls. about 

 1 in. long, purplish, rather abruptly dilated above, the 

 lower lip bearded ; sterile filament strongly yellow- 

 bearded. Dakota to Colo, and N. Good. 

 '30. ovatus, Dougl. Stem slender but erect, 2-4 ft., 

 more or less pubescent: Ivs. ovate, rather thin, bright 

 green, serrate, the upper ones clasping: inflorescence 



