WOOTON AND STANDLEY — FLORA OF NEW MEXICO. 195 



5. Polygonum raraosissimum Michx. Fl. Bor. Amer. 1: 237. 1803. 

 Type locality: "Hab. in regione Illinoensi." 



Range: British America to California, eastward to the Atlantic Coast. 

 New Mexico: Farmington; Dulce; Ojo Caliente; Santa Fe; Pecos; Frisco; Mangae 

 Springs; Mesilla Valley; Tularosa Creek. Lower Sonoran to Transition Zone. 

 A common weed of roadsides and waste ground, often occurring in cultivated fields. 



6. Polygonum sawatchense Small, Bull. Torrey Club 20: 213. 1893. 

 Type locality: Sawatch Range, Colorado. 



Range: Washington and North Dakota to New Mexico. 



New Mexico: Carrizo Mountains; Dulce; Stinking Lake; Siena Grande; Crass 

 Mountain; Gilmores Ranch. Meadows, in the Transition Zone. 



7. Polygonum douglasii Greene, Bull. Calif. Acad. 1: 125. 1885. 



Type locality: "From the Saskatchewan to British Columbia, and southward 

 everywhere in tbe mountains to the borders of Mexico." 



Range : As under type local ity . 



New Mexico: Tunitcha Mountains; Chama; Ramah; Cross L Ranch; Luna; Burro 

 Mountains; West Fork of the Gila; Mimbres River; White Mountains. Transition 

 Zone. 



This is the western equivalent of Polygonum tenue of the Eastern States and is 

 separated from that species by two characters which are not readily apparent. The 

 ripe fruit is deflexed, but much of the ordinary herbarium material fails to sbow the 

 character because the plants are too young. The other character is generally more 

 certainly present though harder to make out. P. tenue has three parallel veins in the 

 leaf, while P. douglasii has only a midvein. Our plant occurs in forests at middle 

 altitudes in the mountains. It is closely related to the next species as well. 



8. Polygonum montanum (Small) Greene, PL Baker. 3: 13. 1901. 

 Polygonum tenue latifolium Engelm. Proc. Acad. Phila. 1863: 75. 1864. 

 Polygonum douglasii lutifolium Greene, Bull. Calif. Acad. 1: 125. 1885. 

 Polygonum douglasii montanum Small, Mem. Bot. Columb. Coll. 1: J 18. L895. 

 Type locality: Rocky Mountains of Colorado. 



Range: New Mexico and Arizona to California and northward in the higher 

 mountains. 

 New Mexico: Upper Pecos River; Beattys Cabin. Canadian Zone 



6. PERSICARIA Adans. Smartweed. 



Annual or perennial herbs; leaves alternate, the blades entire; ocrese cylindric, 



membranous, naked or fringed with bristles; flowers in terminal or axillary spikelike 

 racemes; calyx white, 'greenish, or rose-colored, persistent in fruit; sepals mostly 5; 

 stamens 4 to 8, the filaments not dilated; achenes lenticular or trigonous, usually 

 black. 



KEY TO TIIK Sl'KI II 



Racemes terminal only, usually solitary. 



Leaves elliptic, obtuse or acute; spikes L2 to 24 mm long; 



pedicels glabrous 1 P. amphibia. 



Leaves lanceolate to ovate, acuminate; spikes :;<> mm. long or 



more; pedicels hispid, often glandular 2. /'. muhlmbergU. 



Racemes axillary as well as terminal, numerous. 

 Sheathe without marginal bristles. 



Styles included ■ P. lapathjfolia. 



Styles conspicuously ezserted 4. P. UmgiHffla. 



