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



4. Central pales of the disk densely and conspicuously white-bearded; 

 phyllaries normally lanceolate or linear-lanceolate, gradually acumi- 

 nate, hispidulous but not or scarcely ciliate; leaves usually lanceo- 

 late or lance-ovate, seldom cordate 4. H. petiolaris. 



4. Central pales of the disk not white-bearded; phyllaries ovate, with an 

 abrupt cirrhuslike acumination, hispidulous and conspicuously 

 ciliate; leaves usually broadly ovate, at least the lower ones usually 

 cordate 5. H. annuus. 



1. Helianthus ciliaris DC, Prodr. 5: 587. 1836. 



White Mountains (Apache County) near the San Francisco Peaks, 

 6,500 feet, "Pierce" (perhaps Pierce Ferry, Mohave County), Gila. 

 Indian Reservation (Pinal County), often in saline soil, August to 

 October. Texas to northern Arizona and Mexico. 



Blueweed. Sometimes a troublesome weed in cultivated land, 

 because of the creeping rootstocks. 



2. Helianthus nuttallii Torr. and Gray, Fl. North Amer. 2: 324. 1842. 



Helianthus fascicularis Greene, PL Baker. 3: 28. 1901. 



Greer, Apache County (Eggleston 17091), Tuba, Coconino County 

 (Kearney and Peebles 12876), Oak Creek, Coconino or Yavapai County 

 (Rusby in 1883), 5,000 to 8,800 feet, marshy places, August and 

 September. Saskatchewan to Alberta, south to New Mexico and 

 northern Arizona. 



3. Helianthus anomalus Blake, Wash. Acad. Sci. Jour. 21: 333. 1931. 

 Monument Valley, Navajo County (Eastwood and Howell 6659), 



Hopi Indian Reservation, Navajo County * (Whiting 854), Beaver 

 Dam, Mohave County (Peebles 13083), 2,000 to 6,000 feet, June to 

 September. Utah and northern Arizona. 



4. Helianthus petiolaris Nutt., Acad. Nat. Sci. Phila. Jour. 2: 115. 



1821. 



Apache, Navajo, and Coconino Counties, south to Cochise, Santa 

 Cruz, Pima, and Yuma Counties, 1,200 to 7,500 feet, alluvial and culti- 

 vated land, common, March to October. Saskatchewan to Missouri 

 and Texas, west to British Columbia and California, occasional far- 

 ther east as an introduction. 



The typical form is green or greenish and not conspicuously pubes- 

 cent. The var. canescens A. Gray [H. petiolaris var. canus Britton, 

 H. canus Woot. and Standi.), in its extreme form, is densely canescent- 

 strigose or canescent-strigillose on the leaves, stem, and involucre. 

 This variety occurs in Gila, Pima, and Yuma Counties, 2,500 feet or 

 lower, on sandy or gravelly mesas, ranging from Texas to Arizona. 

 Although at times very distinct in appearance, it intergrades with 

 the typical form. It is also perplexingly close to Helianthus niveus 

 (Benth.) T. S. Brandeg., of Baja California. 



5. Helianthus annuus L., Sp. PL 904. 1753. 



Helianthus lenticularis Dougl. in LindL, Edwards's Bot. Reg. 



15: pi. 1265. 1829. 

 Helianthus aridus Rydb., Torrey Bot. Club Bui. 32: 127. 1905. 



Nearly throughout the State, 100 to 7,200 feet, roadsides and fields, 

 very common, March to October. Saskatchewan to Texas and 



