1921] NATURAL SCIENCES OF PHILADELPHIA. 491 



10. Penstemon tubiflorus Nutt. 



Penstemon tubiflorus Nutt., in Trans. Am. Phil. Soc. II. 5: 181. 1837. "Hab. 

 In wettish prairies, from Forth Smith to Red River [Arkansas Territory. 

 T. Nuttall]." Type seen in Herb, of the Academy of Natural Sciences 

 of Philadelphia. Description of corolla as villose within is difficult to 

 account for, otherwise our plant is certainly described. 



Corolla white throughout. Flowering in late May and early 

 June. 



Sandy or light loam, deciduous or mixed woodland in the Ozark- 

 Ouachita Mountains and hills of Arkansas and eastern Oklahoma, 

 and on prairies in eastern Oklahoma. The plants seen from the 

 Ozarks of Arkansas have habitually a laxer thyrsus and slightly 

 smaller corollas than have those from the prairies and woods of 

 Oklahoma. Also in Ozarks of southern Missouri. 



Arkansas. Madison: Pettigrew, Howell 671 (U). Pope: Rus- 

 sellville, Pennell 10628 (H, M, Y). Pulaski: Little Rock, Pennell 

 10643 (A, C, H, J, K, L, M, O, P, S, T, U, Y). Sebastian: Fort 

 Smith, Bigelow (U, Y). Washington: Fayetteville, Harvey (M). 



Oklahoma. Creek: Sapulpa, Bush 1199 (M, Y). McCurtain: 

 Shawneetown, Houghton 3889 (Y). Pittsburg: McAlester, Penn- 

 ell 10595 (A, C, H, J, K, M, O, S, T, U, Y). Wagoner: Wagoner, 

 Pennell 10610 (A, M, U, Y). 



Texas. Bowie: Texarkana, Heller 4169 (Y). 



11. Penstemon digitalis Nutt. 



Penstemon digitalis Nutt.; Sims, in Bot. Mag. 52: pi. 2587. Aug. [1], 1825. 

 " Communicated by Robert Barclay, . ... to whom the seeds were sent by 

 Professor Nuttall, in March 1824, under the name which we have adopted. 

 Native of the Arkansas territory." Careful description and illustration 

 given. Later, independently redescribed by Nuttall himself in Trans- 

 Am. PhU. Soc. II. 5: 181. 1837. 



Chelone digitalis (Nutt.) Sweet, Brit. Fl. Gard. pi. 120. Aug. 1, 1825. "Perh- 

 stemon Digitalis Nutt. Found by Mr. Nuttall in the Arkansas territory 

 of North America. The plant from which our drawing was taken was 

 received last autumn from New York, by Mr. Anderson, of the Apoth- 

 ecaries' Garden at Chelsea, to whom it was sent by Mr. Hogg." A 

 careful description and illustration certainly of the plant now considered, 

 the description being apparently more accurate than Nuttall's own, or 

 that of Sims, in mentioning the pubescence of the anthers. 



Corolla, westward, white or externally slightly purplish; east- 

 ward the corolla tends to be smaller, more purplish-tinged and with 

 fine violet lines within throat. Flowering from mid-April to early 

 June, depending upon latitude. 



Loam or sandy soil, open woodlands, meadows and prairies; 

 through the Ozark-Ouachita highland of Arkansas and southeastern 

 Oklahoma; thence entering surrounding lowland, cleared Mississ- 

 ippi bottomland of northeastern Arkansas, fields and prairies of 



