72 FLORA OF THE EAST KIDIXG OF YORKSHIRE. 



i66. R. Luteola. Linn,, 95. 



(Dyers' Weed). 

 Native, Brit., 1-7. July. 



Common on railway embankment and in chalk pits. 

 Drewton cutting".* 



CISTINE^. 



170. Helianthemum Chamaecistus. Mill., 92. 



(Common Rock-rose). 



Native, Brit., i, 3, 4. June, III., IV. 



Chiefly on the Wolds, and very common there ; also on 

 gravelly places in Holderness, as at Brandesburton. Dis- 

 tinctly a xerophile. 



VIOLARIE^. 



172. Viola palustris. Linn., 104. 



(Marsh Violet). 



Native, Brit., 2, 6, 7. May, II. 



Near Market Weig-hton (J.J.M.).* Hall Ings, near 

 Cottingham (H.S.). Skipwith Common (W.N.C.). Lang- 

 with (H.J.W., 1882). 



173. V. odorata. Linn., 80. 



(Sweet Violet). 

 Native, Eng., 1-7. -April, I. 



Very common in the East Riding, both on the chalk and 

 in Holderness.* Var. alba (Lange) also common.* 



174. V. hirta. Linn., 72. 



Native, Eng., 3, 4. May, I. 



Very common on the Wolds in early May. A small form 

 IS found flowering in Drewton Dale in August.* 



