120 Coville — Botanical Explorations of Thomas Ntdfall. 



cj-lindric, repandly grooved, reticulated; flowers small, yellow ; fruit dry 

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

 common." Nuttall 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 C'erens. "We now know that the two 

 cylindrical-stemmed l)ranching cactuses growing in the vicinity of San 

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

 Opuntia serpentina Engelm. The earliest siiecific name of this plant being 

 cdlifnrinea, it is here adopte<l. 



Echinocactus viridescens Torr. & Gr. Arid hills near San Diego. 



ONAGRACEAE. 



Oenothera bistorta Nutt. ^ SpJuierostigmu historUi (Nutt.) Walp. 

 Oenothera epilobioides Nutt. = Godetia epilohioides (Nutt.) Wats. 



ATIACEAE. 



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 .4. angustifolium Nutt., 

 with which it was originally collected. 



Apiastrum latifolium Nutt. See Apiastrum a ngiistl folium, to which this 

 plant is referred l)y recent authors. 



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

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



Buryptera lucida x^utt.=^Penre(lanui'n euri/plera Gray. Nuttall's specific 

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

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

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



RUBIACEAE. 



Galium suffruticosum Nutt. = Galium nxtlallil Gray. 



CAMPANULACEAE. 



Nemacladus ramosissimus Nutt. In sandy soil near San Diego. 

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



CARDUACEAE. 



Aromia tenuifolia Nutt. = Ainhlgopappus 2nisillus Hook. & Arn. Near 

 the coast. 



Chaenactis tenuifolia Nutt. Flowering in May. 



Franseria pumila Nntt. ^^ Ambrosia pumila (Nntt) Gray. Near San 

 Diego. 



