292 MISC. PUBLICATION 4 2 3, U. S. DEFT. OF AGRICULTURE 



6. Boerhaavia coulteri (Hook, f.) S. Wats., Amer. Acad. Arts and Sci. 



Proc. 24: 70. 1889. 



Senkenbergia coulteri Hook. f. in Benin, et Hook., Gen. PL 3: 



6. 1880. 



Coconino and Mohave counties to Cochise, Pima, and Yuma 

 Counties, 500 to 5,000 feet. Arizona, southern California, Sonora, 

 and Baja California. 



One of the commonest and most widely distributed species of Boer- 

 haavia in Arizona. 



7. Boerhaavia purpurascens A. Gray, Amer. Jour. Sci. ser. 2, 15: 



321. 1853. 

 Gila, Cochise, Santa Cruz, and Pima Counties, 3,500 to 5,500 feet, 

 often in chaparral and on limestone. Western Texas to Arizona and 

 Sonora. 



8. Boerhaavia erecta L., Sp. PL 3. 1753. 



Gila and Yavapai Counties to Cochise, Santa Cruz, Pima and Yuma 

 Counties, 1,000 to 5,500 feet. Widely distributed in tropical and sub- 

 tropical America. 



The species occurs in Arizona in two nearly equally common forms — 

 (1) the tall, presumably typical form with a relatively loose and race- 

 miform inflorescence; (2) var. intermedia (M. E. Jones) Kearney and 

 Peebles (B. intermedia M. E. Jones), with shorter stems, a more com- 

 pact and umbelliform inflorescence, and smaller fruits. Many speci- 

 mens show intermediate combinations of these characters. 



9. Boerhaavia pterocarpa S. Wats., Amer. Acad. Arts and Sci. Proc. 



17: 376. 1882. 

 Cochise and Pima Counties, 2,300 to 4,500 feet, at roadsides, 

 type from Apache Pass, Cochise County. Arizona and Sonora. 



10. Boerhaavia megaptera Standi., Contrib. U. S. Natl. Herbarium 12: 



379. 1909. 

 Pima County, Tucson to Sells and Topawa, 2,300 to 2,800 feet, 

 type from the Tucson Mountains (Thornber 162). Known only from 

 southern Arizona. 



8. COMMICARPUS 



Plant suffrutescent ; stems leafy, long and weak, usually supported on 

 other plants; flowers in umbels; perianth less than 5 mm. long, yellow- 

 ish white ; fruits narrowly clavate, bearing stipitate glands. 



1. Commicarpus scandens (L.) Standi., Contrib. U. S. Natl. Herbar- 

 ium 12: 373. 1909. 



Boerhaavia scandens L., Sp. PL 3. 1753. 



Pinal, Cochise, and Pima Counties, 2,000 to 4,500 feet, June to 

 September. Western Texas, Arizona, and southward, widely dis- 

 tributed in tropical America. 



9. ANULOCATJLIS 



Plant herbaceous, perennial, with a tuberous-thickened root, 

 subscapose ; stems with a viscid band ; leaves mostly basal, with leath- 

 ery, broadly ovate to suborbicular, more or less cordate blades; 



