326 MISC. PUBLICATION 423, U. S. DEPT. OF AGRICULTURE 



1. Myosurus cupulatus S. Wats., Amer. Acad. Arts and Sci. Proc. 17: 



362. 1882. 

 Mohave County to Cochise and Pima Counties, 2,500 to 5,000 feet, 

 moist soil, usually along streams, February to March, type from 

 between the San Francisco and Gila Rivers, Greenlee County {Greene 

 in 1880). New Mexico to California and Sonora. 



2. Myosurus egglestonii Woot. and Standi., Contrib. U. S. Natl. 



Herbarium 16: 123. 1913. 

 Coconino County, Grand Canyon, 2,000 feet (MacDougal 236a), 

 and Leroux Spring, near Flagstaff, 7,200 feet (Leiberg 5568), northern 

 Gila County (Peebles 13297). Arizona and New Mexico. 



3. Myosurus aristatus Benth., London Jour. Bot. 6: 458. 1847. 

 Young to Payson, Gila County, 5,600 feet (Peebles 13297), Santa 



Rita Mountains, Pima County (Shear 4217), in wet soil, May to June. 

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

 California; South America. 



4. Myosurus minimus L., Sp. PI. 284. 1753. 



Bellemont, Coconino County (Tourney 325), Prescott, Yavapai 

 County (Peebles and Harrison 4175), Sacaton, Pinal County (Peebles 

 1267), flowering in spring. Canada to Florida, Arizona, and Cali- 

 fornia; Europe and Africa. 



10. TRAUTVETTERIA 



Plant perennial, herbaceous; stems tall, branched; leaves alternate, 

 large, deeply palmately lobed, the lobes incised and serrate; flowers in 

 corymbose panicles, perfect, white; perianth in one series (petals 

 none), of 3 to 5 segments, these concave, caducous; stamens and 

 pistils numerous; achenes in heads, sharply angular, not ribbed or 

 the ribs not extending to the apex of the achene. 



1. Trautvetteria grandis Nutt. ex Torr. and Gray, Fl. North Amer. 1: 

 37. 1838. 

 Head of Black River, White Mountains, Apache County, near 

 springs (Goodding 1206), July. Idaho to British Columbia, south to 

 New Mexico, eastern Arizona, and California. 



11. RANUNCULUS. 43 Buttercup, crowfoot 



Contributed by Lyman Benson 



Plants herbaceous; radical leaves with blades entire, 3-lobed, 3- 

 parted, 3-divided, or pinnately compound, the cauline leaves alter- 

 nate or rarely opposite; flowers from terminal buds; sepals 5 or rarely 

 3, seldom persistent in fruit; petals 5, or rarely 6 to 26, yellow, seldom 

 white or red, each bearing a scale-covered nectariferous pit at base of 

 the blade; pistils 5 to many, the single ovule attached at base of the 

 ovary. 



"References: (1) Benson, Lyman, pacific states ranunculi i and n. Amer. Jour. Bot. 23: 26-33, 

 169-176. 1936. the north American subdivisions of ranunculus. Amer. Jour. Bot. 

 27: 799-807. 1940. north American ranunculi. Torrey Bot. Club Bui. 68: 157-172. 

 1941. 

 (2) Drew, W. B. north American representatives of ranunculus § batrachium. 

 Rhodora 38: 1-47. 1936. 



