252 CALIFORNIA ACADEMY OF SCIENCES. 



collected on Long's Exped. ii, 149 (1823); but as the 

 name A . alba is preoccupied, it takes the next, according 

 to D. Prain, Journ. of Bot., xxxiii, 363. 



This was collected only in fruit in two localities, shallow 

 washes, tributary to Epsom Creek, on Barton's Range. It 

 is near Argemone corymbosa Greene, in habit, but that 

 species is only a variety of A. intermedia. Erythea, iv, 

 96. 



My specimens are glabrous, moderately spiny on the 

 stems and leaves; pods cylindrical, 2]/ 2 cm. long, 5-10 

 mm. wide, distinctly the pods of A. intermedia, without 

 hispidity, but with long curved spines. 



5. Thelypodium. 



Collected in flower near the head of Willow Creek, 

 noted also in Butler Wash, without fruit. This is near 

 T. integrifolium Endl. and T. Wrightii Gray, probably 

 a form connecting these two species, or perhaps new. 



The flowers are in a close raceme, pedicels not elong- 

 ating, 1 mm. long; the sepals have crimped, membranous 

 margins. It is biennial, nearly six feet in height, with 

 stout stems branching about half way up into few slender 

 branches. The radical leaves had disappeared, lower 

 cauline, sessile, slightly dentate towards the summit. 



6. Stanleya pinnatifida Nutt., Gen. ii, 71. 



Range of type: " Commencing near the confluence of 

 Paint Creek and the Missouri, growing on the talus of 

 broken calcareous cliffs, from hence it occurs locally for 

 200 or 300 miles further up the river." 



Plants collected in Willow Creek Canon were almost 

 arborescent, with woody stems half an inch in diameter, 

 branching a foot from the ground and growing to a height 

 of more than three feet. The foliage exhibited the 

 marked variability so characteristic of this species; some 



