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2-Parietaria L. Pellitory.e 
sumaeiprowspereneiMh diffusely branched herbs without stinging haire, 
Leaves ‘alternate, 3-veined, exstipulate. Flowers polygamous, borne in 
axillary glomerules , sub tended by bracts. Perianth of 4, (sometimes 3) mo: 
or less united segments , those of the perfect flowers nearly distinct. 
Stamens as many as the perianth segments. Stigmas tufted. Achene ovoid, 
included within the persistent perianth. 
1. P. pennsylvanica L. Aiiiianmepntien.. Slender, annuals, the stems os 
pubescent, 15-40 cm. tall; leaves lanceolate, 2-5 Cm. 
long, thin, acuminate or acute at the apex, narrowed at the base, glabrous, 
the margins entire, petiole shorter than the width of the leaf; bracts 
linear, 4-5 ma. long, obtuse; perianth segments linear~lanceolate; acute, 
hirtellous; achene 1 mm. long, uum! smooth.— > (P. occidentalis Rydb.), 
To be expected in the southwestern part of our range. 
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