590 PROCEEDINGS OF THE AMERICAN ACADEMY 



33. CE. Hartwegi, Benth. Suffruticose, usually low, 3-15' high , 

 decumbent or ascending, branched, more or less canescent or glabrous ; 

 leaves numerous, often crowded, linear to lanceolate, ^ - 2' long, obtuse 

 or acutish, entire or sometimes sparingly repand-denticulate ; flowers 

 mostly near the ends of the branches ; calyx-tube often slender, 1-2' 

 long, 2 - 6" broad at the throat, much exceeding the ovary, pubescent 

 or glabrous, the segments with free linear tips ; petals rhombic-ovate, 

 acute or acutish, 4- 12" long; capsule 8-10" long, 1-1^" thick, 

 sessile, erect, attenuate at base ; seeds oval, very obscurely tuberculate. 

 — From the Indian Territory to Western Texas and Northern Mexico. 



Var. LAVANDUL./EFOLIA. ( (E. lavandulcefolia, Torr. & Gray.) 

 Low, 3-6' higher, pubescent throughout, the leaves mostly linear, \ — 1' 

 long, the calyx-segments less attenuated above. — From Kansas and 

 Colorado to Mexico. 



Var. Fendleri. ( CE. Fendleri, Gray.) Stouter, mostly gla- 

 brous, with oblong-lanceolate leaves and large flowers with a broad 

 throat. 



34. CE. Greggii, Gray. Scarcely more than a variety of the 

 last. More shrubby and diffuse, low, viscidly pubescent or more or 

 less hirsute ; leaves ovate to oblong, 1 - 3" long, acute, mostly sessile ; 

 flowers mostly terminal, the calyx-tube slender, 8 -15" long ; petals, 

 acutish, 3-6" long; capsule \' long. — New Mexico and Northern 

 Mexico; on the Canadian River (Gordon). 



35. CE. tubicula, Gray. Biennial or perennial, usually sub- 

 woody, diffusely branched, 4- 12' high, minutely glandular-puberulent ; 

 leaves linear to oblong-lanceolate, \- V long, acute, entire, the lower 

 petioled ; calyx-tube 4 - 7" long, 2" broad in the throat, the segments 

 short and ovate, with short, free tips ; petals rounded-obovate, obtuse 

 or acute, 4 - 5" long ; capsule 4 - 1" long, 1" broad, nearly terete, 

 shortly pedicelled, dehiscing the whole length ; seeds ovoid-oblong, h" 

 long. — New Mexico and Northwestern Texas. 



36. CE. serrulata, Nutt. Slender, 3-15' high, simple or 

 branched, canescent with short, appressed hairs or nearly glabrous ; 

 leaves linear to lanceolate, 1-3' long, mostly acute or acutish, attenu- 

 ate to the base, irregularly and sharply denticulate ; calyx-tube broadly 

 funnelform, 2 - 4" long, strongly nerved, the short ovate segments with 

 short, free tips ; petals broadly obovate, 3 - 4" long, crenulate ; capsules 

 9 - 15" long, 1" wide, subsulcate over the sutures, sessile, often narrowed 

 to a slender base ; seeds very small, \" long. — From the Saskatche- 



