70 MEMOIRS FROM THE DEPARTMENT OF BOTANY OF COLUMBIA COLLEGE. 
[PuatTe 22. 
22. Polygonum fusiforme Greene. 
Polygonum fusiforme Greene, Erythea, 1: 259 (1893). 
Perennial, stout, nearly glabrous. Stems 9-20 dm. long, decumbent or assurgent, 
conspicuously enlarged above the nodes, more or less geniculate, dark red; internodes 
6-8 cm. long when mature, papillose below the nodes; leaves lanceolate or narrowly 
lanceolate, 2-12 cm. long, 1-2 cm. broad, light green, acute or acuminate at both 
ends, subsessile, glabrous, more or less revolute; ocreae cylindric or funnelform, 1-2 em. 
long, membranous and_ brittle, ciliolate or naked, the delicate ribs somewhat. ciliate; 
inflorescence terminal, nearly simple or paniculate, the ultimate divisions being spicate 
‘acemes; racemes linear-oblong, 1-3 cm. long, not dense; ocreolae 2-2.5 mm. long, 
tinged with pink or rose color, nearly naked or ciliolate; pedicels about 2 mm. long, 
angled; calyx rose-colored or pinkish, 2—2.5 mm. long, four-parted to below the middle, 
the segments broadly oblong or nearly orbicular, obtuse, sometimes conspicuously pune- 
tate, the outer ones hooded at the apex and narrower than the inner; stamens four 
or five, included; style two-parted, included; achene ovoid-oblong, lenticular, 2-2.3 
mm. long, thick-pointed, dark brown, smooth and shining, the angles obtuse, the 
faces plane. 
Western Arizona near the Needles. 
