THE INDIANA WEED BOOK. 



Fig. 35. Showing the flower and fruit. (After Small.) 



23 POLYGONUM CONVOLVULUS L. Black Bindweed. Wild Buckwheat (A. 

 I. 1.) 



Stem twining or trailing, 

 6 inches-3 feet long, roughish, 

 the joints naked ; leaves ovate 

 or arrow-shaped, pointed, long- 

 stemmed, 1-3 inches long. 

 Flowers in loose axillary clus- 

 ters, greenish-white, drooping; 

 calyx 5-parted, adhering close- 

 ly to the achene which is 

 3-angled, black, granular, dull- 

 pointed, inch long. (Figs. 6, 

 a; 35.) 



Common in lowlands, es- 

 pecially in corn- and wheat- 

 fields, where it often twines 

 about and pulls down the 

 stalks or weeds. June-Sept. 

 The leaves and seeds are 

 similar to those of buck- 

 wheat and the plant is dis- 

 tributed widely by overflow 

 of the flood plains and by birds and the droppings of cattle. Rem- 

 edies : mowing and burning before the seeds ripen ; thorough cul- 

 tivation with hoed crops; sowing 

 clean seed; early fall plowing and 

 harrowing to induce the seeds to 



. , . , 



sprout before winter. 



24. POLYGONUM SCANDENS L. Climb- 

 ing False Buckwheat. Bind- 

 weed. (P. N. 3.) 

 Stem climbing, 2-25 feet long, 

 rather stout, branched. Leaves heart- 

 shaped, pointed, 1-6 inches long. Flow- 

 ers greenish-yellow, in numerous inter- 

 rupted leafy panicles ; calyx 5-parted, 

 the three outer segments strongly 

 keeled and in fruit winged. Seeds 

 black, triangular, 1/6 inch long, blunt, 

 smooth, shining. 



Common in moist soil, along 

 fence-rows, borders of thickets and 

 cultivated fields, climbing high 

 over fences, shrubs, brush piles, etc. 

 July-Oct. The seeds are often Fig - 36 ' Sh g5tf thre " 8ided 



