58 JIEMOIES FEOM THE DEPARTMENT OF BOTANY OP COLUMBIA COLLEGE. 



[Plate 16]. 

 i6. Polygonum Pringlei Small. 



Polyyonaiit Prinylei Small, Bull. Terr. 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 cm. long, .2-.8 cm. broad, acuminate at both 

 ends, ciliate, obscurely punctate, subsessile; ocreae cylindric or becoming funnelform 

 when old, .5-1 cm. 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 1.3 mm. long, two-parted or three-parted to below the middle, 

 included; achenes lenticular, biconvex, gibbous or triquetrous, 3 mm. long, broadly 

 obovoid or very broadly oblong, short-pointed, black, smooth and shining. 



San Luis Potosi, Mexico. 



