256 MISC. PUBLICATION 42 3, U. S. DEPT. OF AGRICULTURE 



4. Ramex calif ornicus Kech. f., Repert. Spec. Novarum Regni Veg. 

 40: 297. 1936. 



Prescott, Yavapai County {Peebles et al. 8861), Tucson, Pima 

 County {Tourney 343c). Arizona and California. 



Very similar to R. triangulivalvis except in the absence of callosities. 



*5. Rumex mexicanus Meisn. in DC, Prodr. 14: 45. 1856. 



Not definitely known to occur in Arizona but Rechinger cites a 

 specimen from Ship Rock, northwestern New Mexico. New Mexico 

 and Mexico. 



6. Rumex triangulivalvis (Danser) Rech. f., Repert. Spec. Novarum 



Regni Veg. 40: 297. 1936. 



Rumex salicijolius Weinm. subsp. triangulivalvis Danser, 

 Nederl. Kruidk. Arch. 1925: 415. 1926. 



Coconino County, from the Kaibab Plateau to Long Valley, 7,000 

 to 8,500 feet, apparently also near Prescott (Yavapai County). 

 Quebec to British Columbia, south to New Mexico, Arizona, and 

 California. 



Arizona specimens previously identified as R. mexicanus are referred 

 here by Rechinger. It is doubtful that this form is more than a small- 

 fruited variety of R. mexicanus. 



7. Rumex hymenosepalus Torr., U. S. and Mex. Bound. Bot. 177. 



1859. 



Rumex arizonicus Britton, N. Y. Acad. Sci. Trans. 7: 73. 1889. 



Navajo, Coconino, and Mohave Counties, south to Santa Cruz and 

 Pima Counties, 6,000 feet or lower, common and conspicuous in sandy 

 stream beds, fields, etc., March to April, type of R. arizonicus from 

 Fort Verde, Yavapai County {Mearns 300). Wyoming to Utah, 

 western Texas, Arizona, northern Mexico, and California. 



Canaigre, wild-rhubarb. The high tannin content has aroused 

 interest in canaigre but attempts to cultivate the plant have not been 

 financially successful hitherto. The United States Department of 

 Agriculture is now conducting experiments to this end. The petioles 

 make a good substitute for rhubarb in pies. Indians and Mexicans 

 use the leaves of this and other species of Rumex for greens and eat the 

 petioles roasted or stewed with sugar. As with other greens that are 

 sufficiently succulent, the Papago Indians roast rather than boil 

 canaigre leaves, probably because of the frequent scarcity of water. 

 The Hopi and Papago Indians used the roots for treating colds and 

 sore throat and a dye was formerly obtained from them by the Navajos. 



8. Rumex orthoneurus Rech. f., Repert. Spec. Novarum Regni Veg. 



40: 294. 1936. 

 A very distinct species, known only from the type collection in the 

 Chiricahua Mountains, Cochise County, 7,800 feet {Blumer 1449). 



9. Rumex occidentalis S. Wats., Amer. Acad. Arts and Sci. Proc. 12: 



253. 1877. 



Rose Creek, Sierra Ancha, Gila County {Harrison and Kearney 

 5964), flowering June. Labrador to British Columbia, south to New 

 Mexico, central Arizona, and California. 



The collection cited is referred somewhat doubtfully to this species, 

 the inflorescence being exceptionally open and long-branched. The 



