186 
OCTANDRIA, TRIGYNIA. 
on the west side of the bridge, close to the mill which I have 
particularly mentioned under the head of Smyrnium integer- 
rimum, p. 146. Perennial. May. 
ORDER III. TRIGYNIA. 
191. POLYGONUM. Gen. pi. 677. {Polygonece.) 
Calioo 5-parted^ petaloid^ persistent. Seed 
superior^ 3-sided, covered by the conni- 
vent calix. (The number of the stamina 
and styles uncertain.) — JVutt. 
§ 1 . Flowers axillartj. 
avicuiai:e. p, flowers octandrous, trigynous; leaves lanceo- 
late, rough on the margin, nerves remote 5 stem 
procumbent, herbaceous. — Willd. 
6cangmtifo- leaves small, lanceolate-oblong. — Mich. 
inirru aviculare, Muhl. 
Common Knot-grass. 
jiafitoiium, leaves broad, oval-obtuse, like the leaves of box. 
— Mich. 
P. erectum, Muhl. and Willd. 
Upright Knot-grass. 
On road sides, in wastes, among* rubbish, and in garden^ ; 
every where very common. Annual. All summer. 
simrolimn, £. P. verj much branched; stems and branches 
angular-flexiiose ; leaves linear, channelled, 
short above, somewhat subulate ; all very up- 
right, rigid, submucronate, sessile; flowers ax- 
illary, remote, alternate, solitary. Bart. Prod\ 
FI. Ph. p. 48. 
P. tenue, Mich ? 
P. barbatum, Walt ft 
