1921] NATURAL SCIENCES OF PHILADELPHIA. 493 



deep-violet lines. Flowering from early April to early June, depend- 

 ing upon latitude. 



Heavy loam, swales and low woodland, mostly in alluvial soil, 

 along the bottomlands of the lower Mississippi valley north to 

 northeastern Arkansas, and also westward near the Gulf coast to 

 the Brazos River, Texas. Near sea-level in Louisiana, Arkansas, 

 and Texas ; seen from east of the Mississippi River only from Tangi- 

 pahoa Parish, Louisiana. 



Arkansas. Hempstead: Fulton, E. J. Palmer 10514 (M). 

 Independence: Newark, Pennell 10699 (A, C, H, J, K, M, U, Y). 

 Miller: Mandeville, Eggert (M). Pulaski: Little Rock, Hasse (Y). 



Louisiana. Acadia: Crowley, Pennell 10186 (A, H, L, S, U, Y). 

 Rapides: Alexandria, Ball 654 (M). 



Texas. Brazoria: Brazoria; Columbia, Bush 115 (M, Y). 

 Fort Bend: Richmond, Bray 79 (T, U). Harris: Houston, Pen- 

 nell 10258 (T, Y). Liberty: Liberty, E. J. Palmer 7727 (M), 

 9598 (M). 



14. Penstemon arkansanus Pennell, sp. nov. 



Stems clustered, several from a clump, 3-6 dm. tall, grayish-pub- 

 erulent over entire surface, often purple. Leaves membranous, 

 slightly paler beneath, finely puberulent on both surfaces; the 

 lowest narrowed to petiole-like bases, the longest 7-10 cm. long, 

 obtuse to acute, crenate-serrate; the upper lanceolate, acutish to 

 acuminate, somewhat serrate; the bracts much reduced. Thyrsus 

 less than one half the height of the plant, longer than wide, of 3-9 

 fascicles, each of two axillary branches which repeatedly branch 

 cymosely, the pedicels much shorter than ths primary peduncle. 

 Sepals in anthesis 2-3 mm. long, in fruit 4-5 mm. long, ovate, acute 

 to acuminate, obscurely scarious-margined, glandular-pubescent. 

 Corolla 15-17 mm. long, the tube and throat 11-12 mm. long, the 

 throat narrow, slightly inflated, two-ridged within distally on 

 anterior side, the orifice open; the two posterior lobes 2-2.5 mm. 

 long, united over one half length, their free portions upcurved-spread- 

 ing; the three anterior lobss 4-5 mm. long, united at base; the cor- 

 olla externally finely glandular -pubescent, internally slightly pubes- 

 cent over bases of anterior lobes; white, on anterior side with violet 

 lines. Anther-cells divaricate, oblong, dark-violet, .6-.7 mm. long, 

 glabrous, opening throughout. Sterile filament slightly exserted, 

 flat, not wider distally, moderately bearded distally with yellow 

 hairs. Capsule at least 6-7 mm. long, ovate-acuminate in outline, 

 glabrous, not seen mature. 



Type, shale and sandstone woods, Pulaski Heights above Little 

 Rock, Pulaski County, Arkansas, collected in flower and young 



