58 MEMOIRS FROM THE DEPARTMENT OF BOTANY OF COLUMBIA COLLEGE. 
[Puate 16]. 
16. Polygonum Pringlei Small. 
Polygonum Pringlei Small, Bull. Torr. Club, 19: 357 (1892). 
Perennial, slender, glandular, light green. Stem erect or decumbent and creeping, 
6-15 dm. long, branched, glandular throughout, the base becoming woody; leaves vary- 
ing from linear-lanceolate to linear, 3-10 em. long, .2-.8 em. broad, acuminate at both 
ends, ciliate, obscurely punctate, subsessile; ocreae cylindric or becoming funnelform 
when old, .5-1 em. long, thin and brittle, loose, sparingly hispidulous, eciliate; inflor- 
escence paniculate, very glandular, the ultimate divisions ending in spicate racemes; 
racemes oblong-ovoid, 1-2 cm. long, erect, sometimes geminate, thick but rather loosely- 
flowered; ocreolae funnelform, 3-3.5 mm. long, oblique, pubescent, ciliate; pedicels 
slender, 3 mm. long, angled; calyx light pink, 3-4 mm. long, five-parted to near the 
base, the segments oblong-ovate, obtusish; stamens usually eight, included or slightly 
exserted; style 1.5 mm. long, two-parted or three-parted to below the middle, 
included; achenes lenticular, biconyvex, gibbous or triquetrous, 3 mm. long, broadly 
oboyvoid or very broadly oblong, short-pointed, black, smooth and shining. 
San Luis Potosi, Mexico. 
