CATALOGUE. 317 



Polygonum lapathifolium, Ait., Var. incanum, Koch. New York, 

 Lake Superior region and on the Saskatchewan ; rare. In Provo Canon of 

 the Wahsatch ; 6,000 feet altitude ; July. (D. C. Eaton.) 



Polygonum vivipaeum, L. White Mountains of New Hampshire, and 

 from Lake Superior to Labrador and the Arctic Sea, Greenland and Behring 

 Strait; southward in the mountains to Colorado and California. Clover 

 Mountains, Nevada, and in the Uintas; 8-11,000 feet altitude; July-Sep- 

 tember. (1,067.) 



Polygonum Bistorta, L. DC. Prodr. 14. 125. Ehizoma thick and 

 twisted ; stems annual, very simple ; sheaths long and striately nerved ; leaves 

 glabrous or puberulent beneath, the lowest cordate, obtuse, with a long 

 winged petiole, the upper subsessile, the highest linear or abortive ; spike 

 dense, oblong, obtuse ; pedicels exceeding the flowers ; stamens exserted. — 

 Var. oblongifolium, Meisn. Stem simple, j-2° high ; leaves glabrous, the 

 lowest oblong, the blade 3-8' long, 1-2' broad, scarcely decurrent by an ab- 

 ruptly attenuate base into a very long petiole ; spike oblong, J-2' long. — From 

 Behring Strait and the Arctic Coast southward in the mountains to Califor- 

 nia and New Mexico. East Humboldt and Clover Mountains, Nevada, and 

 in the "Wahsatch and Uintas; 6-9,000 feet altitude; July-September. (1,068.) 



Var. lineaeifolium. Leaves very narrow, attenuate at base, 3-6' long, 

 1-4" wide; spike short, (6-9";) stem 1J° high. — East Humboldt Mountains, 

 Nevada; 9,500 feet altitude. (1,069.) 



Polygonum Convolvulus, L. JordanValley, Utah; introduced. (1,070.) 



Polygonum (Aconogonon) polymoephum, Ledeb. DC. Prodr. 14. 139. 

 Stem erect, branched ; sheaths large, membranous, pubescent, striately 

 veined, not ciliate, obliquely truncate, soon lacerate, subdeciduous ; leaves 

 short-petioled, ovate-oblong, lanceolate or linear, narrowed or rounded at base, 

 ciliolate, pubescent or glabrous ; panicle terminal, exceeding the leaves, of 

 compound many -flowered racemes ; bracts small, membranous, not ciliate, 

 2-3-flowered ; pedicels exserted, in fruit shorter than the calyx ; calyx peta- 

 loid, 5-parted, not glandular, slightly enlarging ; stamens 8 ; style very short, 

 3-cleft; achenium triangular, equaling or scarcely exceeding the calyx, smooth 

 and shining, with oval-rhomboid faces ; cotyledons accumbent, sunk in a de- 

 pression of the albumen. Var. a. alpinum, Ledeb. Stem glabrous ; sheaths 

 pilose or rather rarely glabrous ; leaves ovate-oblong or lanceolate, acuminate, 

 shortly attenuate at base, flat, slightly pubescent, or glabrate above ; panicle 



