POLYGONUM. 3G3 



mit striate with raised points opaque about equalling the perianth. 

 E. B. 12o2. Sy. E. B. 1229 1231. L. usually blunt, some- 

 times acute, broad or narrow. Fl. either very distant and scat- 

 tered, or so much collected as almost to form a leafy spike. St. 

 erect or procumbent. Ocrese sometimes long and much torn. 

 Nut usually falling short of the perianth, but sometimes slightly 

 exceeding it. Very variable. Some botanists think that it 

 includes several species; but I am quite unable to divide what 

 I have seen similarly. /3. P. littorale (Link); st. long, diffuse, 

 prostrate, 1. thick broad, nut minutely punctured finely striate. 

 Waste places. /3. Sands by the sea. A. V. IX. Knot-grass. 



E'. S. I. 



11. P. Rail (Bab.) ; Z. elliptic-lanceolate ./?, ocrece lanceolate 

 acute with few distant simple veins at length torn, nut smooth 

 shining exceeding the perianth. E. B. S. 2805. St. long, strag- 

 gling, prostrate. L. bending towards the stem. Filaments 

 broader at the base. Resembling P. aviculare in habit, but P. 

 maritimum in fruit. It varies with smaller 1. and fl. Sandy 

 sea-shores. A. or P. VIII. IX. E. S. I. 



12. P. marit'imum (L.) ; I. elliptic-lanceolate coriaceous with 

 revolute edget, ocrece lanceolate with many branched veins at 

 length torn, nut smooth shining exceeding the perianth. 

 E. B. S. 2804. St. procumbent, quite woody below, often much 

 buried. L. convex above, diverging from the stem. Filaments 

 broader at the base. Sands of tne southern sea-shores. Christ- 

 church, Hants. Braunton Burrows, Dev. Falmouth. Channel 

 Islands. P. VIII. IX. E. 



IP. sagittdtum (L.), with reflexed prickles and ovate sagittate L, a 

 native of N. America,, has been found in Kerry.] 



#### Ocrece semicylindrical. Root fibrous. Nut triquetrous. 

 Stam. 8. Styles 3. Fl. racemose. 



13. P. Convolvulus (L.) ; st. twining angular, 1. cordate-sagit- 

 tate, segments of perianth bluntly keeled, nut opaque striate with 

 minute points. E. B. 941. St. climbing or prostrate, much 

 shorter than in the next species. /3. subalatum (v. Hall) ; 

 periauth-segm. winged ; often taken for Sp. 14. Cultivated 

 and waste land. A. VII. IX. Black Bindweed. E. S. I. 



14. P. dumetdrum (L.) j st. twining striate, 1. cordate sagit- 

 tate, segments of perianth winged, nut very smooth and shining. 

 E. B. S. 2811. St. wiry, climbing to the height of 4 or 5 

 feet. Thickets in the South, rare. A. VII. IX. E. 



