OF ARTS AND SCIENCES : OCTOBER 14, 1862. 69 



a. Multiflori ; panicula thyrsoidea vel racemiformi nuda, foliis (canlinis 

 aut argute serrulatis aut subintegerrimis) superioribus ad bracteas 

 parvas diminutis, pedunculis vulgo tri-plurifloris ; corollas labio 

 superiore saspius parum breviore. 



These species with the two preceding, all very difficult of definition 

 in the herbarium, need re-examination in the living state. I have 

 examined fresh flowers only of P. Digitalis and P. pubescens, — than 

 which no two species are more clearly distinct, although in dried speci- 

 mens they may not always be readily identified. From the shape of 

 the corolla, P. glaucus should also be re-established. And I am obliged 

 to intercalate an unpublished species of Nuttall, P. humilis, between the 

 latter and P. gracilis, Nutt., here reduced to P. pubescens. The two 

 new species which follow are choice fruits of Messrs. Parry, Hall, and 

 Harbour's collection, during the present season, which, with other good 

 materials, have come to hand just in time to find a place in this article 

 as it is passing into the printer's hands (November, 1862). 



42. P. PUBESCENS, Soland. (P. Icevigatus, Soland. P. Mrsutus, 

 Willd. P. Mackayanus, Hortul.) Sub-1 - 3-pedalis, viscoso-pubescens 

 vel fere glaber ; foliis caulinis (nunc lineari- nunc ovato-) lanceolatis ; 

 thyrso laxifloro ; corolla albida cserulescente vel purpurascente su- 

 perne sensim paullo ampliata leviter obcompressa sub labio inferiore 

 plicis 2 intrusis sursum barbatis percursa, fauce subclausa ; filamento 

 sterili deorsum longe denseque barbato. — Canada to Florida and 

 Texas. In the fresh flowers the two introrse plicae of the lower side of 

 the corolla, and the throat somewhat closed by the approximation of 

 the base of the lower lip to the rather fornicate upper one, are char- 

 acteristic. 



^. GRACILIS. (P. gracilis, 'Nutt.; Bot. Mag. t. 2945, excl. descr. 

 Graham; Bot. Cab. t. 1541.) Subglaber; foliis caulinis et thyrso 

 angustatis ; corolla vulgo graciliori, plicis baud barbatis. — Saskatcha- 

 wan to Texas. Clearly this is only a slender variety of P. pubescens, 

 with the flowers commonly rather narrower, and its beard (always 

 unreliable in this genus) reduced to some scattered hairs on the lower 

 lip. Intermediate forms abound. 



43. P. HUMILIS, Nutt. in herb. Acad. Philad. P. gracili Nutt. (P. 

 pubescenti var. gracili supra) maxirae affinis, sed vulgo humilior (3 - 

 9-pollicaris), foliis pallidioribus, thyrso etiam strictiore, corolla satu- 

 rate cserulea breviore (baud ultra-semipollicari) fauce satis ampliata 

 hiante plicis sub labio inferiore obsoletis. — Rocky Mountains, Nuttall 



