GISSING : FLORA OF WAKEFIELD. 



251 



PopuLUS. Linn. Poplar. 

 P. alba, L. White Poplar. T. March. — April. In hedges. 

 P. tremula, L. Trembling Poplar or Aspen. T. March — April. Frequent, 

 P. nigra, L. Black Poplar. T. April. Frequent 



MONOCOTYLEDONOUS, OE ENDOGENOUS FLOWERING 



PLANTS. 



Sub-Class I.— PETALOID.^:. 



Order— HYDEOCHARIDACE^. 



Anacharis. Rich. Anacharis. 

 A. alsinastrum, Bab. Long-flowered Anacharis. P. July — September. 

 Common. This plant which was first discovered in Great Britain only 

 in 1841 — is now found almost everywhere. It can easily be understood 

 how canals and running streams may have carried portions of the plant 

 from place to place — but it has been found in small pools far above the 

 level of these water-courses, and if not native the difficulty is to account 

 for its appearance in these places. 



Order— ORCHID ACE^. 

 Epipactis. Br. Helleborine. 

 E. latifolia, Sw. Broad-leaved Helleborine. P. July. — September. Carlton^ 

 (Mr. Roberts), Haw Park. 



LiSTERA. Br. Bird's Nest, or Twayblade. 

 L. ovata, Br. Common Twayblade. P. May — July. Woolley, New 

 MiUer Dam, Bullcliffe Wood, &c. 



Neottia. Jacq. Lady's Tresses. 

 N. spiralis. Rich. Fragrant Lady's Tresses. P. August — September. 

 Went Vale, (Mrs. Watson.) 



Orchis. Linn. Orchis. 

 0. Morio, L. Green Winged Meadow Orchis. P. June — July. Frequent. 

 0. mascula, L. Earl}' Purple Orchis. P. April — June. Frequent. 

 0. ustulata, L. Dwarf dark winged Orchis. P. May — June. Went 



Yale, (Mrs. Watson.) 

 0. latifoUa, L. Marsh Orchis. P. June — July. Frequent. 

 0. maculata, L, Spotted Palmate Orchis. P. June — July. Common. 



