396 CONTRIBUTIONS PROM THE NATIONAL HERBARIUM. 



southern form is marked by its more erect, less branched habit, yellowish green leaves, 

 more strongly pubescent stem, and narrower and firmer fruit. The plants are com- 

 mon upon the sandy mesas bordering the Rio Grande Valley in this region, but do not 

 occur in the valley itself. They spring up in late summer after the rains, seldom or 

 never becoming diffuse and spreading like the more northern plant. 



2. Abronia maritima Nutt.; S. Wats, in Brewer & Wats. Bot. Cal. 2: 4. 1880. 

 Type locality, "On the sea coast from Santa Barbara to San Diego," California. 



Specimens examined: 



Baja California: All Saints Bay, May 15, 1885, Greene; San Martin Island, 1889, 

 Pond; San Quentin Bay, February, 1889, Palmer 721; Socorro, May 7, 1886, 

 Orcutt; without locality, Diquet; Cape San Quentin, May 10, 1885, Greene; 

 La Playa de Santo Tomas, July 17, 1885, Orcutt; San Bart61ome Bay, 1911, 

 Rose 223; San Josef, 1911, Rose 559. 

 Sonora: Near Guaymas, February 22, 1904, Palmer 1210. 

 Sinaloa: Altata, April 18, 1910, Rose, Standley & Russell 14836; Altata, June 15, 



1897, Rose 1347. 

 Tepic: Maria Magdalena Island, May 28, 1897, Maltby 174. 

 The type of this species is not to be found in the herbarium of the Philadelphia 

 Academy of Science, at least no specimen of the plant accessible to Nuttall is there. 

 There is however, a specimen of Ifesperonia calif ornica from "St. Barbara, prope maris, 

 N. Calif.," given, in Nuttoll's handwriting, the specific name of maritima and referred 

 to the genus Calymenia. Is it possible that Doctor Watson misunderstood Nuttall's 

 application of the name maritima and referred it wrongly to the genus Abronia? 



3. Abronia torreyi Standley, Contr. Nat. Herb. 12: 319. pi. SS. 1909. 



Type locality, "Mesilla, Donna Ana County, New Mexico." Type collected by 

 E. O. Wooton in 1897 (no. 11). 

 Specimens examined: 



Chihuahua: Sandy soil, Rio Grande Valley, Juarez, alt. 2,310 meters, May 5, 

 1901, Pringle 9465; sandhills near Paso del Norte (Ciudad Juarez), May 5, 

 1885, Pringle 77; sandhills below El Paso (Ciudad Juarez), 1840, Wislizenus 

 93; Ciudad Juarez, 1905, Purpus. 



4. Abronia villosa S. Wats. Amer. Nat. 7: 302. 1873. 

 Type locality, "Arizona." 



Specimens examined: 



Sonora: Mesa near La Grulla, January 3, 1904, MacDougal. 



5. Abronia platyphylla Standley, Contr. Nat. Herb. 12: 314. pi. S3. 1909. 



Type locality, "Del Mar, California." Type collected by T. S. Brandegee, May 12, 

 1894. 



Specimens examined: 



Baja California: Lob Angeles Bay, 1887, Palmer 604; San Quentin Bay, Feb- 

 ruary, 1889, Palmer 735. 



6. Abronia gracilis Benth. Bot. Voy. Sulph. 44. 1844. 

 Type locality, "Bay of Magdalena," Baja California. 



Specimens examined: 



Baja California: Sandy plains, Calmalli, 1898, Purpus 81; San Bart61ome Bay, 

 1889, Pond; Magdalena Island, 1889, Brandegee; Abrojos Point, 1876, Streets; 

 San Ramon, 1886, Orcutt; Magdalena Bay, Bryant; Magdalena Island, 1911, 

 Rose 315; San Bartolome Bay, 1911, Rose 198. 



10. OKENIA Schlecht. & Cham. 



Olcenia Schlecht. & Cham. Linnaea 6: 92. 1830. 

 Type species, Okenia hypogaea Schlecht. & Cham. 



