THE FLORAL LIST. 45 
POLYGONUM AMPHIBIUM, L. 1799, Young. -+all. v. TERRESTRE, 
Leers. 1895, Stow. —I, 2, 4,5, 17: 
POLYGONUM AVICULARE, L. 1836, Dodsworth. +all. v. ARENASTRUM, 
Bor. 1894, Lees. +3, 7) 9, 10, 12, 13. V. RURIVAGUM, Jord. 
1895, Stow. +3, 10, 13, 14, 15- 
POLYGONUM BISTORTA, L. 1820, Ward. —1, 4, 7,9, 1%) 17; 18. 
POLYGONUM CONVOLVULUS, L. 1830, Dodsworth. -+all. 
POLYGONUM FAGOPYRUM, L. =FAGOPYRUM SAGITTATUM, Gilib. 
POLYGONUM HYDROPIPER, L. 1851, Watson. —2, 4, 9, 12, 16, 17, 18. 
POLYGONUM LAPATHIFOLIUM, L. 1851, Watson. —1I, 4,6, 8, £8. 
POLYGONUM MACULATUM, Trim. & Dyer. 1868, Charters. +3, 5, II. 
POLYGONUM PERSICARIA, L. 1836, Dodsworth. -+all. 
POLYGONUM RAII, Bab. 1872, Britten. +1I. 
POLYGONUM ROBERTI, Loisel. =P. RAII, Bab. 
[POLYGONUM VIVIPARUM, L. 1746. Mistake. ] 
POLYPODIUM VULGARE, L. 1789, Gen. Magaz. —4,5,9 16, 17, 18. 
POLYPOGON MONSPELIENSIS, Desf. 1898, Smith. +4. 
POLYSTICHUM ANGULARE, Presl. 1876, Fowler. +5, 8, 11. 
POLYSTICHUM LOBATUM, Presl. 1356, Bogg. +1, 4, 8, IT. 
POPULUS ALBA, L. 1841, Stark. +2, 3, 5; 6, 7, 10, II, 13, 15- 
POPULUS ALBA x TREMULA. 1862, Cole. +3, 13. 
POPULUS BALSAMIFERA, L. 1876, W.-P. +2. 
POPULUS CANESCENS, Sm. =POPULUS ALBA x TREMULA. 
POPULUS DELTOIDES, Marsh. 1799, Young. +17. 
POPULUS FASTIGIATA, Ait. =P. ITALICA, Moench. 
POPULUS ITALICA, Moench. 1841, Stark. +2, 3, 6, 15. 
POPULUS MONILIFERA, Ait. =P. DELTOIDES, Marsh. 
POPULUS NIGRA, L. 1841, Stark. +2, 3,6, 7, 10, 11, 12, 13,15, 18. 
POPULUS PYRAMIDALIS, Roz. =P. ITALICA, Moench. 
POPULUS TREMULA, L. 1851, Watson. —T, 4, 6, 9, 14, 15, 17, 18. 
PORTULACA OLERACEA, L. 1897, Brewster. +7. 
POTAMOGETON ACUTIFOLIUS, Link. 1795, Banks. +11 or 12. 
POTAMOGETON ALPINUS, Balb. 1804, Brit. Mus. Herb. +4, 7,9, 13, 14. 
POTAMOGETON ANGUSTIFOLIUS, Bercht. & Presl. 1883, Beeby. +16. 
POTAMOGETON COLORATUS, Hornem. 1818, Banks. +2, 3, 12. 
POTAMOGETON CRISPUS, L. 1836, Dodsworth. —17, 18. 
