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



53. SANVITALIA 



Slender annual; leaves opposite, lanceolate or lance-linear, mostly 

 entire; heads small, terminal, radiate, the rays white; pales of the 

 receptacle with rigid cuspidate tips; rays sessile, persistent on the 

 achenes; ray achenes narrowly 4-sulcate, their pappus of 3 short awns 

 or tubercles; disk achenes 4-angled, epappose or nearly so. 



1. Sanvitalia aberti A. Gray, Amer. Acad. Arts and Sci. Mem. ser. 

 2, 4: 87. 1849. 

 Apache County to eastern Mohave County, south to Cochise, 

 Santa Cruz, and Pima Counties, 4,500 to 7,300 feet, dry slopes and 

 mesas, July to September. Western Texas to Arizona and northern 

 Mexico. 



54. HELIOPSIS. Oxeye 



Perennial herb ; leaves opposite, triangular-ovate, usually toothed, 

 petioled; heads solitary, terminal, long-peduncled, radiate, yellow, 

 showy; rays pistillate, persistent on the achenes; achenes short and 

 thick, epappose. 



1. Heliopsis parvifolia A. Gray, PI. Wright. 2: 86. 1853. 



Mountains of Cochise, Santa Cruz, and Pima Counties, 4,000 to 

 8,000 feet, rich soil in canyons, July to September. Southwestern 

 Texas to southern Arizona and northern Mexico. 



55. ECLIPTA 



Low annual herb ; leaves opposite, lanceolate, toothed ; heads radiate, 

 white, peduncled in the upper axils; rays numerous, short, narrow; 

 pales of the receptacle bristlelike ; achenes short, thick, 3- or 4-angled, 

 truncate, epappose or essentially so. 



1. Eclipta alba (L.) Hassk., PL Jav. Rar. 528. 1848. 



Verbesina alba L., Sp. PI. 902. 1753. 



Sacaton (Pinal County), near Marana (Pima County), along the 

 Colorado River (Yuma County), up to 2,000 feet, along streams and 

 ditches, June to September. Massachusetts to Nebraska, south to 

 Florida, Texas, southern Arizona, California, and South America; 

 widely distributed in the warmer regions of the world. 



56. RUDBECKIA. Coneflower 



Tall perennial; leaves alternate, the lower ones pinnately divided 

 into few lobes, the upper leaves 3-cleft to entire; heads large, radiate, 

 yellow; involucre herbaceous; disk becoming cylindric; achenes 4- 

 angled; pappus a short crown. 



1. Rudbeckia laciniata L., Sp. PI. 906. 1753. 



Rudbeckia umbrosa Greene, Leaflets 2: 153. 1911. Not R. 

 umbrosa Beadle and Boynton, 1901. 



Apache County to Coconino County, south to Cochise and Pima 

 Counties, 5,000 to 7,500 feet, rich soil along mountain streams, July 

 to September, type of R. umbrosa from Oak Creek, Coconino County 



