254 MISC. PUBLICATION 4 2 3, U. S. DEPT. OF AGRICULTURE 



53. Eriogonum leptophyllum (Torr.) Woot. and Standi., Contrib.U.S. 



Natl. Herbarium 16: 118. 1913. 



Eriogonum effusum Nutt. var. leptophyllum Torr. in Si tgr eaves, 

 Rpt. Zuni and Colo. 168. 1854. 



Apache and Navajo Counties, 5,000 to 6,000 feet, August to October. 

 Northwestern New Mexico and northeastern Arizona. 



54. Eriogonum simpsoni Benth. in DC, Prodr. 14: 18. 1856. 



Eriogonum macdougalii Gandoger, Soc. Rov. Bot. Belg. Bui. 



42 2 : 191. 1906. 

 Eriogonum effusum Nutt. subsp. simpsoni Stokes, Gen. Eriog. 



81. 1936. 



Apache County to Mohave and Yavapai Counties, 3,500 to 7,500 

 feet, July to September. Colorado to Nevada, New Mexico, and 

 Arizona. 



One of the commonest species in the yellow pine forests of northern 

 Arizona. Perhaps only a variety of E. microthecum Nutt., differing 

 chiefly in its strongly revolute leaf blades. E. macdougalii (type 

 MacDougal 176, Grand Canyon) is a form with exceptionally long- 

 peduncles. 



55. Eriogonum mearnsii Parry ex Britton, N. Y. Acad. Sci. Trans. 



8: 72. 1889. 



Navajo, Coconino, and Yavapai Counties, 3,000 to 6,500 feet, 

 August to October. Known only from Arizona, 



The typical form, with leaf blades green and glabrous above, is 

 known only from the type collection (Fort Verde, Yavapai County, 

 Mearns 179). A much more common form is var. pulchrum (Eastw.) 

 Kearney and Peebles (E. pulchrum Eastwood) with leaf blades floccose- 

 pubescent and whitish above. The type of E. pulchrum was collected 

 at Crater Mound, Coconino County (Eastwood 15746). 



5. RUMEX. 37 Dock, Sorrel 



Plants herbaceous, mostly perennial; leaves alternate, simple, the 

 stipules united into a cylindric, more or less fugacious sheath; flowers 

 perfect or unisexual; perianth calyxlike, 6-parted, the 3 inner segments 

 becoming enlarged and winglike in fruit; stamens 6; stigmas 3; fruit 

 a triangular achene. 



Most of the species are coarse plants and several are weeds intro- 

 duced from the Old World. R. triangulivalvis and R. violascens are 

 reported to be eaten freely by livestock. The majority flower in 

 summer. 



Key to the species 



1. Flowers usually dioecious; leaf blades hastately lobed 1. R. acetosella. 



1. Flowers usually monoecious; leaf blades never hastately lobed (2). 

 2. Stems erect, ascending, or procumbent, with axillary shoots (3) . 



3. Leaf blades ovate-lanceolate, broadest below the middle; inner sepals 

 (valves) more than 4.5 mm. long in fruit (4). 

 4. Inner sepals one or all often bearing a pronounced grainlike callosity. 



2. R. ALTISSIMUS. 



4. Inner sepals without a callosity or one sepal bearing a very narrow 

 elongate callosity (essentially a thickened midnerve). 



3. R. ELLIPTICUS. 



Reference: Rechixger, K. H., Jr. the xorth americax species of rvmex. Field Mus. Xat. 

 Hist., Bot. Ser. 17: 1-151. 1937. 



