1921] NATUEAL SCIENCES OF PHILADELPHIA. 485 



Free portions of posterior lobes of corolla upcurv- 

 ing-reflexed. Inflorescence 6-12 cm. wide. 

 Stems obscurely puberulent. Basal leaves 12-18 

 cm. long, acuminate, sharply serrate, the stem- 

 leaves acuminate -attenuate, all glabrous. Plants 

 forming large clumps, of very many stems. 



15. P. midticaulis. 



Corolla 20-30 mm. long, pinkish- or purplish-white, 

 its throat longer than the tube, the orifice some- 

 what-closed by the anterior lip which upcurves 

 as an arc. Sterile filament densely bearded. 

 Leaves just below inflorescence tending to be 

 much reduced, so stem less ''leafy." 



16. P. pauciflorus. 



CC. Leaf-blades filiform, less than 1 mm. wide. Corolla 15-20 

 mm. long, its throat decurved, narrow, not inflated. Ster- 

 ile filament glabrous. Plant not forming winter rosettes, 

 the bases of the stems perennial. VL Ambigui. 



17. P. amhigims. 



AA. Anther-cells pendulous (so anthers tend to be horseshoe-shaped), 

 opening partially by pro.ximal slits (v/hich extend over two thirds 

 length of sac). Leaves coriaceous, all sessile, and the lower 

 cauline leaves persistent on the perennial bases of the stems. 

 Corolla deep-carmine, its posterior lobes projecting, the anterior 

 recurved. (Saccanthera.) VIL Baccharifolii. 



18. P. baccharifolius. 



1. Penstemon murrayanus Hook. 



Penstemon murrayanus Hook., in Bot. Mag. 63: pi. 3472. 1836. "A native 

 of San Felipe, in Texas: discovered by Mr. Drummond, in 1S34." GroAvn 

 in the Glasgow Botanic Garden. Drummond, Coll. II, 292, from which 

 collection the seeds for culture were likely obtained, seen in Herb. Columbia 

 University at the New York Botanical Garden. 



Sand, open woods or prairies, through the short-leaf pineland of 

 eastern Texas, westward locally in the cross-timbers (oak-woods) 

 and coast prairie; from southwestern Arkansas to San Augustine, 

 Refugio and Milam counties, Texas. Flowering from late April to 

 mid- June. 



Arkansas. ■ : Fort Towson, Leavenworth (A, Y). 



Texas. Ellis: Ennis, Hogan (U). Gregg: Gladewater, Rev- 

 erchon 2542 (M, U). Houston: Grapeland, Tharp ( T, Y). 

 Milam: Milano, E. J. Palmer 11661 (M). Refugio: Refugio, E. J. 

 Palmer 9119 (M). San Augustine: San Augustine, E. J. Palmer 

 9512 (M). Smith: Swan, Reverchon 3221 (M, U, Y). Waller: 

 Hempstead, Hall 409 (U, Y). . 



