OF ARTS AND SCIENCES : OCTOBER 14, 1862. 71 



dilated at the insertion. Flowers solitary or in pairs in the axils, the 

 short peduncle usually bibracteate, forming a short racemose inflores- 

 cence. Beard of the sterile filament short, but copious and extend- 

 ing well down one side. This charming Pentstemon may appropri- 

 ately bear the name of one of its zealous discoverers. 



b. Bi-triflori; caulibus usque ad apicem oequaliter foliatis; pedunculis 

 unifloris plerisque ebracteatis ; corolla3 tubo vix gibboso, labiis 

 cequilongis. 



46. P. Harbourii (sp. nov.). Nanus, 2 - 4-pollicai-is ; caulibus 

 multicipitibus pruinoso-puberulis usque ad apicem 2 - 3-florum jequali- 

 ter foliosis ; foliis fere glabris crassiusculis obovatis oblongisve obtusis- 

 simis integerrimis vel repandis ; pedicellis alternis cum calyce sub- 

 aequilongo viscoso-pubescentibus ; sepalis ovatis breviter acuminatis 

 seu lato-lanceolatis margine baud scariosis ; corolla purpurea (7-9 lin. 

 longa), tubo cylindraceo limbo breviter bilabiato, labio superiori pro- 

 funde bilobo, inferiore profunde trilobo intus ad faucem hispido-bar- 

 bato ; filamento sterili apice dilatato bine deorsum barbato. — Rocky 

 Mountains of Colorado Ten-itory, in the high alpine region, no. 396 

 of Hall and Harbour's distribution ; found only by Mr. J. P. Harbour, 

 whose name it should bear. Leaves thickish, glabi'ous or minutely 

 pruinose, 4 to 8 lines long, 3 to 5 lines wide, sometimes retuse ; the 

 uppermost closely sessile by a more or less narrowed base, the lowest, 

 or those of sterile shoots, ovate and tapering into a slender petiole. 

 Pedicels in the axils only of the uppermost leaves, and alternate, in 

 flower 1|, in fruit 2 or 3 lines long. Corolla bluish purple, slightly 

 viscous-pubescent ; the tube slightly widening upwards ; the lips about 

 3 lines, the similar and spreading rounded lobes 1^ to 2 lines long ; a 

 copious and rather stiff beard in the throat or on the base of the lower 

 lip. Capsule not exceeding the calyx. 



++ ++ -^-1- Filamento sterili apice barbato : corolla manifeste bilabiata, 

 tubo vix aut ne vix ampliato. Transmontani, panicula interrupta, 

 cymis multifloris condensatis, floribus pro genere parvis 5-8 raro 

 9 — 11 lin. longis. 



a. Serratifolii ; foliis ovatis seu ovato-lanceolatis ssepius argute denta- 

 tis, caulinis superioribus basi subcordata amplexicaulibus ; sepalis 

 vix scarioso-marginatis ; floribus minus confertis. 



47. P. OVATUS, Dougl. Puberulus, latifolius ; sepalis ovatis seu 

 lato-lanceolatis ; corolla purpureo-cserulea. Oregon to British Co- 

 lumbia. 



