142 62. POLYGONACE^E. 



simple, erect, 1 2ft. high. Radical le. ovato-lanceolate, on long 

 winged footstalks; stem le. nearly sessile, ovate, subcordate. 

 Racemes terminal, dense, oblong. Fl. pink, with small bracts. 



Frequent. Moist meadows and borders of fields. (B) P. 6 9. Banks of Clyde 

 above Rosebank ; west end of Cambuslang; banks of the Kelvin. " Kilbride," 

 Ure. Cumbrae and Arran. 



2. P. viviPARUM, L. Viviparous Alpine- Bistort. Stem 

 simple, slender, 4 8 in. high. .Radical le. on long stalks, linear 

 or oblong; stem le. nearly sessile, linear-lanceolate, margins 

 revolnte. Spike lax, bulbiferous at the base, terminating with a 

 few white flowers. 



Frequent. On the tops of the highest mountains. (H) P. 68. Ben Lomond 

 hills above Loch Eck. 



3. P. AVICULARE, L. Common Knot-Grass. Stem erect or 

 prostrate, wiry. Le. stalked, elliptic or lanceolate. Ochrea 

 2-lobed, becoming white and ragged on the edges. Fl. axillary, 

 small, on short stalks, green and pink, with white edges. Achene 

 covered by the peri., striate, with raised points. 



Very common. Waste places and roadsides. (B) A. 5 9. 



A variety is got growing on sand by the sea side, with thickish 

 le., and the achenes finely striate, punctures minute. P. liitorale, 

 Link. 



4. P. RAII, Bab. Ray's Knot-Qrass. Stem prostrate, long, 

 and straggling. Le. elliptic-lanceolate. Peri, not covering the 

 large, smooth shining achene. 



Frequent. On sandy sea shores. (B) A. 7 9. Bute ; Innellan ; Cumbrae and 

 Arran. 



*5. P. FAGOPfRUM, L. Common Buck- Wheat, Brank. Le. 

 stalked, cordato-sagittate, acute. Fl. in cymose panicles. 



An escape from cultivation. New City road; rubbish on the Possil road. A. 

 7-8. 



6. P. CONVOLVULUS, L. Climbing Buck- Wheat, Black Bind- 

 weed. Stems angular, twining, very long. Le. stalked, cordato- 

 sagittate, pointed. Ochrea short. Fl. racemose, lower ones in 

 small, loose axillary clusters. Peri, greenish, keeled on the back. 

 Achene striate with minute points. 



Common. In corn fields and waste places. (B) A. 79. 



Styles usually 2. 



7. P. AMPHIBIUM, L. Amphibious- Bistort. Stems long. Le. 

 floating, stalked, rising from long ochreae, broadly-lanceolate, 

 smooth, rough on the margins. Fl. in oblong spikes, solitary, 

 terminal, rose-coloured. 



Frequent. Floating in ponds and lakes. (B) P. 78. Hogganfield and Bar- 

 dowie lochs ; quarry at Possil; Gourockto Arran. 



