FLOWERING PLANTS AND FERNS OF ARIZONA 261 



13. Polygonum pennsylvanicum L., Sp. PL 362. 1753. 



Persicaria pennsylvanica Small, Fl. Southeast. U. S. 377. 1903. 



In a marsh near Tuba, Coconino County, 5,000 feet (Kearney and 

 Peebles 12877). Nova Scotia to Minnesota, south to Florida, Arizona, 

 and Mexico. 



The collection cited is referred tentatively to var. laevigatum Fernald. 



14. Polygonum incanum F. W. Schmidt, Fl. Boem. 4: 90. 1795. 

 Near Hannigan, White Mountains, Greenlee County, about 8,700 



feet, in wet soil, August (J. Whitehead 1557, Kearney and Peebles 

 12410, 12430). Introduced sparingly into the United States from 

 Europe. 



The specimens cited are referred doubtfully to this species. 



15. Polygonum punctatum Ell., Bot. S. C. and Ga. 1: 455. 1817. 



Persicaria punctata Small, Fl. Southeast. U. S. 379. 1903. 



Navajo and Gila Counties to Cochise, Santa Cruz, and Pima 

 Counties, 2,300 to 5,000(?) feet, along streams, July to October. 

 Throughout most of the United States and south to Guatemala. 



16. Polygonum fusiforme Greene, Erythea 1: 259. 1893. 



Persicaria jusijormis Greene, Leaflets 1: 24. 1904. 



Sabino Canyon, Pima County, about 3,000 feet (Thornber 232, 

 Harrison and Kearney 7252), August to September. Arizona and 

 southeastern California. 



The specimens cited have somewhat less pointed achenes than the 

 type, which came from the Colorado River Valley in California. 



17. Polygonum persicaria L., Sp. PL 361. 1753. 



Persicaria maculosa S. F. Gray, Nat. Arrang. Brit. PL 2: 269. 

 1821. 



Grand Canyon, Flagstaff, and Williams (Coconino County), 

 Prescott (Yavapai County), Huachuca Mountains (Cochise County), 

 5,000 to 7,000 feet, marshy places along streams, July to September. 

 Extensively naturalized in North America, from Europe. 



8. FAGOPYRUM. Buckwheat 



An annual glabrous herb; leaves alternate, petioled, with broad 

 hastate blades; flowers in terminal or axillary racemes, these usually 

 forming panicles; perianth greenish white, 5-parted; stamens 8; 

 style 3-parted; acnene triangular. 



1. Fagopyrum esculentum Moench, Meth. PL 290. 1794. 



Near Patagonia, Santa Cruz County, at roadside (Peebles et al. 

 5613). An escape from cultivation in many parts of the United 

 States but scarcely naturalized. 



34. CHENOPODIACEAE. Goosefoot family 



Plants herbaceous or shrubby; leaves simple, without stipules; 

 flowers perfect or unisexual, not showy; perianth when present with 

 1 to 5 segments; stamens as many as or fewer than the perianth 



