CONTRIBUTIONS TO WESTERN BOTANY. 683 



calyx tube narrowly obconic, 4" long; calyx tips free ; 

 buds oval, 2" long; petals round to rhombic, 3" long; 

 pods nearly sessile, straight or arcuate, 12-18" long, i|" 

 wide, blunt, scarcely narrowed at tip, bluntly 4-angled; 

 seeds very small. The plants are inclined to be floccose- 

 woolly. 



Rosario, Lower California, Orcutt, April 30, 1886; 

 Mojave Desert, California, May, 1884, Lemmon; Sur- 

 prise Canon, Panamint Mountains, California, Coville & 

 Funston, Nos. 624 and 725; also No. 208, Funeral 

 Mountains, California, 1891, same collectors. Types in 

 National Herbarium. 



OENOTHERA TENUISSIMA 



No. 6083. September 26, 1894, Rockville, Utah, 4000° 

 alt., in clay washes. 



This plant belongs to the section Chylismiaoi Watson. 

 Plants annual, very much branched throughout, forming 

 a large, rounded, erect, bushy clump, 3° high or less, 

 with very slender branches and long axillary and terminal 

 racemes, about 8' long; these are fioriferous throughout; 

 each flower is bracteate with a minutely pediceled, green, 

 ovate to triangular bract below each pedicel; the bracts 

 become minute above and gradually enlarged into small, 

 acute, shortly-petioled leaves below. The main leaves 

 are lanceolate, sparsely and very slightly and irregularly^ 

 dentate, acute at both ends, on a varying petiole, with 

 prominent primary and secondary veins below, which are 

 often purplish; leaves minutely pubescent below, and 

 sometimes with very delicate, sparse, white hairs; plants 

 otherwise wholly glabrous, the blade of the leaf is usually 

 about 10" long, and the petiole as long or much shorter; 

 pedicels usually 5-8" long and filiform; pods clavate- 

 oblanceolate, about half the pedicels, inclined to be 

 4-angled, obtuse at apex, a little less than i" wide; the 



