82 memoies from the depaetmeni of botany of columbia college. 



[Plate 28.] 

 28. Polygonum hirsutum Walter. 



Pohjgnnam /i/'r.v»itm Walter, Fl. Car. 132 (1788); Michaux, Fl. Bor. Am. 1: 239; 

 Persoon, 8yn. 1: 440; Muhlenberg, Cat. 41; Pursh, Fl. Am. Sept. 270; Elliott, Bot. S. 

 C. and Ga. 1: 454; Sprengel, Syst. 2: 253; Meisner, Monog. 79 and in DC. Prodr. 14: 

 103; Eaton & Wright, N. A. Bot. Ed. 8, 369; Wood, CI. Bk. Ed. 4, 475; Am. Bot. and 

 Fl. 283 ; Chapman, Fl. S. States, 389 ; Darby, Bot. S. States, 489. 



Polygonum hirsutum var. dasyphyUum Meisner, in DC. Prodr. 14 : 103 (1856). 



Perennial, conspicuously hispid with reddish or brown hairs. Stem erect or decum- 

 Ijent and creeping, 3-9 dm. long, simple or branched either above or from the creeping 

 base, more or less densely clothed with spreading hispid hairs, becoming woody below ; 

 leaves lanceolate, 3-10 cm. long, .6-2 cm. broad, cordate or subcordate, acute at the apex, 

 the upper ones acuminate, more or less hispid on both surfaces, ciliate, inconspicuously 

 punctate, subsessile; ocreae cylindric, 1-1.5 cm. long, very hispid, fringed with many but 

 rather short bristles; inflorescence paniculate, strict, the ultimate divisions ending in 

 spicate more or less geminate racemes, sometimes nearly simple; racemes erect, 1.5-6 cm. 

 long, narrow or almost linear, rather loosely flowered, sometimes interrupted ; ocreolae 

 funnelform, oblique, 2 mm. long, acute, fringed with a few bristles ; pedicels about 3 mm. 

 long, angled ; calyx 2.5-3 mm. long, white, five-parted to below the middle, the segments 

 oblong, obtuse ; stamens eight or fewer, included ; style three-parted to below the middle, 

 1 mm. long, often shorter; acliene triquetrous, 2 mm. long, broadly obovoid or nearly 

 oblong, short-pointed, black, smooth and shining. 



Wet soil, Florida and Georgia. 



Polygonum hirsutum glabrescens Meisner. 

 Polygonum hirsutum var. glabrescens Meisner, in DC. Prodr. 14: 103 (1856). 



More slender than the species. Stem erect, 2-4 dm. long, glabrous or sparingly 

 strigose especially about the nodes; leaves narrowly lanceolate, 3-6 cm. long, .5-1 cm. 

 broad, glabrous except the midrib and a few straggling hairs on the upper and lower 

 surfaces, obtuse ; ocreae hispid. 



Lake Jacnony and Tallahassee, Florida. 



