494 PROCEEDINGS OF THE ACADEMY OF [PaRT III 



fruit May 31, 1920, F. W. Pennell 10640; in Herbarium of the New 

 York Botanical Garden. 



This was the plant called "Penstemon levigatum" by Nuttall 

 in his Flora of Arkansas. 



Near Penstemoji paUidus Small, a species which has softly pubes- 

 cent leaves and more acuminate sepals. 



Thin rocky or sandy soil, shale or sandstone, Ozark and Ouachita 

 mountains and hills of Arkansas and southeastern Oklahoma. 

 Flowering in late April and May. 



Arkansas. Carroll: Beaver; Eureka Springs, Bush 1522 (M). 

 Garland: Hot Springs, Foreman (U). Pope: Russellville, Pennell 

 10629 (M, Y). Pulaski: Little Rock, Pennell 10640 (A, C, H, J, K, 

 L, M, S, T, U, Y), 10651 (A, C, H, O, P, U, Y). 



Oklahoma. Leflore: Page, Stevens 1374 (M, U). 



14a. Penstemon arkansanus pubescens Pennell, n. var. 



Stem 4-7 dm. tall, pubescent with fine glandless hairs, and also 

 somewhat hirsute with spreading mostly gland-tipped hairs. Stem- 

 leaves 20-40 mm. wide, nearly ovate, acuminate, serrate, pubescent 

 beneath on the principal veins. Inflorescence as in the species. 



Type, sandstone woodland, Penters Bluff, Izard County, Ark- 

 ansas, collected in late flower and young fruit, June 1, 1920, F. W. 

 Pennell 10679; in Herbarium of the New York Botanical Garden. 



On sandstone and limestone, Izard county, Arkansas; probably 

 through northern Ozarks of northern Arkansas and southern 

 Missouri. 



Arkansas. Izard: Guion (limestone cliff), Pennell 10685 (A, Y), 

 (sandstone cliff), Pennell 10690 (Y); Penters Bluff (sandstone wood- 

 land), Pennell 10679 (H, M, U, Y). 



15. Penstemon mnltlcaulis Pennell, sp. nov. 



Stems many from a clump, 4-7 dm. tall, obscurely puberulent; 

 often purplish. Leaves membranous, slightly paler beneath, glab- 

 rous on both surfaces; the lowest narrowed to petiole-like bases, 

 the longest 12-18 cm. long, acuminate, sharply serrate; the upper 

 lanceolate, mostly attenuate -acuminate, serrate; the bracts much 

 reduced. Thyrsus less than half the height of the plant, little 

 longer than wide, of 6-9 fascicles, each of two axillary branches 

 which repeatedly branch cymosely, the pedicels much shorter than 

 the long primary and secondary peduncles. Sepals in anthesis 3-4 

 mm. long, in fruit 5-6 mm. long, ovate-acuminate, obscurely scar- 

 ious margined, glandular-pubescent. Corolla 15-17 mm. long, the 

 tube and throat 11-12 mm. long, the throat narrow, shghtly inflated, 



