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. (Polygonex.) 



Calix 5-parted, petaloid, persistent. Seed 

 1, superior, 3-sided, covered by the conni- 

 vent calix. (The number of the stamina 

 and styles uncertain.) — JVutt. 



§ 1. Flowers axillary. 



adulate, j. p. flowers octandrous, trigynous; leaves lanceo- 

 late, rough on the margin, nerves remote ; stem 

 procumbent, herbaceous. — Willd. 



& angusti/o- leaves small* lanceolate-oblong. — Mick. 

 P. aviculare, Muhl. 



Common Knot-grass, 



ft lavuoiium. leaves broad, oval-obtuse, like the leaves of box. 

 — Midi. 

 P. erectum, Muhl. and Willd. 



Upright Knot-grass. 



On road sides, in wastes, among" rubbish, and in gardens ; 

 every where very common. Annual. All summer. 



iimioiium. 2. P. very much branched; stems and branches 

 angular-flexuose ; leaves linear, channelled, 

 short above, somewhat subulate ; all very up- 

 right, rigid, submucronate, sessile; flowers ax- 

 illary, remote, alternate, solitary. Bart. Prod'. 

 Fl. Ph. p. 48. 

 P. tenue, Mich ? 

 P. barbatum, Walt? 



