THE FLORA OF HALIFAX. 99 



Populus nigra, L. Black Poplar. 

 Alien. Tree. April. 

 1841. Planted near Luddenden. — Herb. S. King. 

 1867. Dam Head in Shibden, common. — /. Walker. 

 In plantations, &c. 



EMPETRACE^ 



Empetrum nigrum, L. — 72. Crowberry. 



Native. Scottish t)'pe. Shrub. April-Ma}^. 



1775. Norland, Warley, Sowerby and Rishworth moors: 

 in Snake-hill, near the town of Halifax. — J . Bolton. 



1830. Midgley and Warley Moors, common ; 1847. 

 Castle Carr. — Herb. S. King. 



1840. On all the high moors in the neighbourhood of 

 Halifax. -Bailies' Flora. 



1862. Beacon Hill, Halifax ; Warley; Shroggs. — /. Bates; 

 MialVs Flora. 



1867. Above High Green Wood, on the banks of the river 

 Hebden. — /. Walker. 



1888. On nearly all the Calder moorlands. — F. A. Lees. 



Very abundant on the high moorlands, from Ogden to 

 Blackstone Edge aiulGorple Stones ; gone from Beacon 

 Hill and Snake-hill, but still on the rocks at Woodhouse 

 Scar, Skircoat. 



CERATOPHYLLEiE. 



Ceratophyllum demersum, L. — ? Hornwort. 

 Native. English type. P. July-Odtober. 



Only in the Canal near Salterhebble, where it was first 

 observed by the late II. T . Soppitt, in 1895. 



CONIFER^. 



[Juniperus communis, L. — 77. Juniper. 



Native. Extinct. British type. Shrub. May-June. 

 1775. A few plants towards the top of Illingworth Moor, 



but they were very small. — J. Bolton.'] 

 Taxus baccata, L. — 52. Yew. " View Trees." 



Alien. British type. Tree. March-April. 

 1674. " 4 view trees set about my house, Sept. 1st, 



1674." Rev. Oliver Hey wood, Event Book ; Works, ed. J. 



H. Turner, Hi. p. 213. Also see idem vol. ii, pp. 166 & 169, 



and Notes and Queries for 1884 p. 130 with respe<5t to the 



name of a farm, " View Trees," at Lightcliffe. 



