LXXXII. POLYGONACEiE 
425 
15 17. Polygonum sagittatum, Linn. ; FI. Br. Ind. v. 47. Stems 
glabrous, 1-3 ft., nearly erect or prostrate, square, with small, 
sharp, recurved prickles along the angles. Leaves thinly hairy, 
stalked or the upper nearly sessile, linear-oblong, 1-2 in., pointed, 
arrowhead-shaped, the stalks and midrib prickly ; stipules tubular, 
short. Flowers pink, in small, long-stalked heads ; bracts flat. 
Perianth 5-parted. Stamens 6 or 8. Styles 3, free nearly to the 
base. Nut 3-angled. 
Kulu to Assam, 4000-8000 ft. ; May-October. — W. Himalaya, 7000-8000 ft. 
— N. Asia, X. America. 
Common in ricefields and wet places, sometimes growing in dense masses. 
18. Polygonum polystachyum, Wall. ; FI. Br. Ind. v. 50. 
Shrubby, erect, 3-6 ft. ; stems angled, hairy, becoming tomentose 
