206 BOTANY. 



lanceolate, hairy, acute, as long as or exceeding the pedicels; corolla 

 whitish, 6" long. Choisy, in DC. Prod. vol. ix, p. 443, speaks of the 

 peduncles as being L-3-flowered. In all my specimens, the flowers axe 



solitary. — Ash ('reck, Arizona (152 a, Loew, and 307). 



Evolvulus Arizonicus, Gray. — Procumbent or ascending, 6-12' long, 

 silky-hairy; leaves linear-lanceolate to lanceolate, acute, 4-10" long; 

 peduncles capillary, G-18" long, bracteate at the forks and bearing 1-3 

 flowers (usually 3); flowers blue, 6— 8" in diameter, Balver-shaped j sepals 

 acute; anthers distinctly auriculate at base; pedicels reflexed after fall of 

 the flower; ovary 1 -celled. — Camp Grant, Ariz. (376 and 151 a, Loew, 

 Arizona). 



Cressa Cretica, L., var. Truxillensis, Chois. — Arizona. 



CUSCUTE^E. 

 By Dr. George Engelmann. 



Cuscuta (Ci.istogrammica) salina, Engelm. — Stems slender, low; 

 flowers (lh-2h lines long) delicate white, pedicelled in loose cymes; calyx- 

 lobes ovate-lanceolate acute, as long as the similar but mostly broader and 

 overlapping denticulate lobes, and as the shallow-campanulate tube of the 

 corolla; filaments about as long as the oval anthers; fringed scales mostly 

 shorter than the tube, sometimes incomplete ; styles equalling or shorter 

 than the somewhat pointed ovary; capsule surrounded (not covered) by the 

 withering corolla, mostly 1 -seeded. 



Saline or brackish marshes in the Gila Valley on Suada, Rothrock 

 (333), 1874 ; also on the California coast, near Santa Barbara, on Franlcnia 

 and Salsola, Rothrock (101), 1875. Similar to C. Californka, from which 

 it is at once distinguished by its larger flowers and the presence of the 

 infra-stamineal scales. 



Cuscuta (Clistogrammica) arvensis, Beyrich. — Ash Creek, on Soli- 

 dago, Rothrock (31 I ), 1874, and Camp Lowell, on Datura meteloides, Rothr< >ck 



5), 1874. These specimens, especially the latter, growing on a very 

 juicy nurse-plant, have coarser steins than the Southeastern form and larger 

 flowers and fruit; the calyx is not angular, its lobes rounded; those of 

 the corolla very acute. 



