TJO Coville Botanical Exploration* <>f Thomas NuttalL 



cyliudric, repandly grooved, reticulated; flowers small, yellow ; fruit dry 

 and spiny. Arid hills and denuded tracts near St. Diego, California, 

 common." Nnttall apparently preserved no specimen of the plant, and 

 Torrey and Gray, having only this meager description as a guide, placed 

 the species doubtfully in the genus Cere.ns. We now know that the two 

 cylindrical-stemmed branching cactuses growing in the vicinity of San 

 Diego are of the genus Opnnfia, and that the yellow- flowered one is 

 Opuntia serpent ina Engelm. The earliest specific name of this plant being 

 calif ornica, it is here adopted. 



Echinocactus viridescens To IT. & Or. Arid hills near San Diego. 



OXAGRACEAE. 



Oenothera bistorta Nutt. = Sphaerostigma bistorta (Nutt.) Walp. 

 Oenothera epilobioides Nutt. = Qodetia epilobioides (Nutt.) Wats. 



APIACEAE. 



Apiastrum angustifolium Nutt. On this and the following species 

 Nuttall based his genus Apiastrum. Both were collected at San Diego in 

 April. 



Apiastrum angustifolium tenellum Nutt. This, according to Dr. 

 J. N. Rose, appears to be only a slender form of A. angustifolium Nutt., 

 with which it was originally collected. 



Apiastrum latifolium Nutt. See Apiastrum angustifolium, to which this 

 plant is referred by recent authors. 



Deweya arguta Torr. & Gr. = Velaea arguta (Torr. & Gr.) Coult. & 

 Rose. This species was the type of Torrey and Gray's genus Deweya. 



Euryptera lucida Nutt.=Peucedanum euryptera Gray. Nuttall' s specific 

 name is older than Gray's and should be adopted. This was the type 

 species of Nuttall' s genus Euryptera, and the type specimen was collected 

 in April in the " woods of St. [San] Diego." 



KUBIACEAE. 



Galium suffruticosum Nutt. = Galium nuttallii Gray. 



CAMPANULACEAE. 



Nemacladus ramosissimus Nutt. In sandy soil near San Diego. 

 This is the type species of Nuttall's genus Nemacladus. 



CARDUACEAE. 



Aiomia tenuifolia Nutt. Amblyopappus pusillus Hook. & Arn. Near 

 the coast. 



Chaenactis tenuifolia Nutt. Flowering in May. 



Franseria pumila Nutt. = Ambrosia pumila (Nutt.) Gray. Near San 

 Diego. 



