580 PROCEEDINGS OF THE AMERICAN ACADEMY 



— On stream banks, from Western Texas to Southern Utah and 

 Eastern Arizona. 



t t Flowers in a leafy spike; capsule linear, f-l'long, 1 — 1^", 

 thick ; seeds oblong, the angles not margined, minutely tubercu- 

 late. Erect, 1-2° high; leaves 2-3' long; calyx-tube slender, 

 1- IV long. 



3. CE. heterophylla, Spach. ( (E. btfrons, Don.) Often branched 

 above ; pubescence usually sparse, strigose or hirsute, mostly subap- 

 pressed ; leaves lanceolate, acute, the lower attenuate at base, and occa- 

 sionally sinuate-pinnatifid, the upper repand-denticulate, the uppermost 

 oblong- to ovate-lanceolate, or subcordate ; spike rather loose and few- 

 flowered ; calyx villous with scattered, spreading hairs ; petals 8 - 12' 

 long, roundish, obtuse or subacute. — Texas. 



4. CE. rhombipetala, Nutt. Rarely branching, appressed-puberu- 

 lent and subcanescent ; leaves narrowly lanceolate, acuminate, denticu- 

 late, the lowest attenuate to a petiole and rarely pinnatifid, diminish- 

 ing upwards into the close, elongated, conspicuously bracted spike, the 

 uppermost often subcordate ; calyx-tube very slender, the segments ca- 

 nescent with short, close, appressed hairs ; petals rhombic-ovate, 6-10" 

 long, acute or acutish ; filaments and elongated style filiform. — From 

 Illinois to Minnesota, Kansas, and the Indian Territory. 



t t t Flowers axillary ; capsules linear, 1 — iy thick. 



5. (E. humifusa, Nutt. Stems decumbent or ascending, \ -2° 

 long ; pubescence dense, canescent, short, appressed ; leaves narrowly 

 lanceolate or oblanceolate, \ - V long, acute, sparingly repand-dentate 

 or entire, the radical leaves pinnatifid ; calyx-tube 1' long or moi'e, two 

 to three times longer than the petals, the free tips of the segments short ; 

 capsule ^-1' long, silky ; seeds oblong, somewhat angular, smooth. — 

 On the sea-coast from Cape May to Cape Florida. 



6. CE. Drummondii, Hook. Stems decumbent or ascending, 1 -2° 

 long, simple or branched ; pubescence more or less dense, short, stri- 

 gose, appressed, longer and more spreading on the calyx and ovary ; 

 leaves oblong-lanceolate or oblanceolate, \ — 2V long, acute, attenuate 

 to the base, entire or sparingly repand-denticulate, or subsinuate-toothed 

 at base ; calyx-tube 1-2' long, rather thick, equalling or a little exceed- 

 ing the petals ; capsule 1 - 2\' long ; seeds oblong or oval, very obscure- 

 ly angled and obscurely pitted. — Coast of Texas. 35 xantus, a 

 densely white-tomentose specimen from Cape St. Lucas, Lower Cali- 



