130 MEMOIRS OF THE ?sE\V YORK BOTANICAL GARDEN. 



long, acute, i-ribbed, sessile: ocreae silvery, 2-parted, segments 

 lanceolate, acuminate ; bracts several, crowded at the top of the stem, 

 imbricated, linear to linear-lanceolate, acute, ascending : calyx 

 about 1.5 mm. long, its segments ovate, acute, white or pinkish, with 

 a short green midrib, the outer involute and slightl}- keeled in age ; 

 stamens minute ; st3'le 3-parted ; segments very small, spreading ; 

 achenes 3-angled, about 1.3 mm. long, lustrous, slightly margined, 

 included. 



It is very closely related to P. Watsonii, differing mainly in the 

 mostly solitary and long leaf and shorter bracts, and it grows in wet 

 places, especially along margins of pools, at an altitude of 2000- 

 2500 m. 



Montana: Beaver Head Co., 1888, Tzcccdy : Cedar Mts., July 

 16, 1897, Rydberg <£- Besscy, 536"/ : Shoshone Lake, Aug. 10, Jj68. 



* Polygonum paronychioides Small. 



Annual, bushy. Foliage glabrous : stems copiously branched at 

 the base and above; branches slender, rather wiry, 8-15 cm. long, 

 erect or ascending, clothed with a shining bark, somewhat zigzag ; 

 leaves remote below, approximate above ; blades linear, 8-10 mm. 

 long, with an acute green tip, entire, jointed to the short very deli- 

 cate soon lacerate ocreae, i-nerved: calices short-pedicelled, solitary 

 or few together : segments green, with pale or pink margins, nar- 

 rowly-ovate to oblong-lanceolate, slightly accrescent, becoming fully 

 2 mm. long, slightly keeled, acutish ; achenes rhombic with the distal 

 end longer, and slightly acuminate, about 2 mm. long, 3-angled, 

 granular. 



Polygonum ^aronxcJn'oidcs is most closely related to Polxgomirn 

 Watsonii^ but differs from that species in the very bushy habit and the 

 leaves are much shorter and more numerous. The inflorescence 

 of the two species is different, that of the pi cut just described being 

 scattered along the branches and not collected at the ends in closely 

 bracted racemes. The calyx and the achene are narrower and 

 longer than in P. Watsonii. 



In meadows and edges of ponds. 



Montana: South of Birch Lake, 1883, Canby, 2/g (type in herb. 

 College of Pharmacy, New York). 



Polygonum Convolvulus L. Sp. PL 364 [Man. R. M. 321 ; 111. Fl. 

 I : 565 ; Bot. Cal. 2 : 15]. 

 Introduced into waste places. 



Montana: Bozeman, 1892, W. T. S/iaz^' : Missoula, 1880, 

 Watson . 



