NO. 2 gentry: LAND PLANTS 137 



name B. Hindsiana takes precedence over B. rhoifolia, because Art. 56 

 of the International Rules makes binding the first selection of a name 

 out of two or more applicable to the same species under the same date. 

 In this case the rule invalidates later combinations made apparently on 

 the basis of page priority. B. Hmdsiana appears to be common to the 

 rocky slopes and washes from Los Angeles Bay south through the penin- 

 sula and has also been collected on the north central Sonoran coast 

 (Pringle, sine no. in 1884). 



BuRSERA MICROPHYLLA Gray, Proc. Am. Acad. Sci. 5:155. 1861. 



San Gabriel Bay, Espiritu Santo Island, March 7, Rempel 93. Ca- 

 beza Ballena, Cape District, March 3, Rernpel 57. 



On rocky slopes and draws it is scattered through the Sonoran 

 Desert. A closely related plant, B. morelensis from the state of Morelos, 

 Mexico, has doubtfully been referred to synonomy under this species 

 (Bullock I.e. p. 371). 



Malpighiaceae 



Thryalis angustifolia (Benth.) Kuntze, Rev. Gen. PI. 1:89. 

 1891. 



San Jose del Cabo, February 17, Dawson 1209. 



Widely distributed in northwestern Mexico; the type from Cape 

 San Lucas, Baja California. A suffrutescent plant, in the above speci- 

 men 2 to 3 dm tall, the ovary glabrous except for a few minute hairs on 

 the apex and angles. 



Euphorbiaceae 



Adelia virgata Brge., Zoe 4:406. 1894. 



Cabeza Ballena, Cape District, March 3, Rempel 63. Agua Verde 

 Bay, Baja California, March 10, Rempel 137 , in wash. 



Arroyos along the mountains of the Cape District and the Sierra 

 Giganta as far north as Comondu, and reported by Johnston on the 

 adjacent gulf islands of San Jose, Espiritu Santo, and Ceralvo; type 

 from the Sierra Laguna, Cape District. It is an erect slender shrub with 

 several branches bearing fascicles of obovate leaves. The Rempel collec- 

 tions are sterile. 



DiTAXis Brandegei (Millsp.) Rose & Standi., C.N.H. 16:13. 1912. 



Puerto Escondido, February 11, Dawson 1108. Agua Verde Bay, 

 Baja California, March 10, Rempel 123. 



Widely but infrequently scattered in the California Gulf Region; 

 type from San Gregorio, Baja California. A rather succulent polypodial 



