I06 FLORA OF THE EAST RIDING OF YORKSHIRE. 



623. Sedum acre. Linn., 107. 



(Biting Stone-crop, or Wall-pepper). 



Native, Brit., 1-7. July, I. 



On old walls and roofs ; frequent also on gravelly chalk 

 fields. Weedley near South Cave (C.W.).* Old village 

 walls in Derwentland (M.B.S.). Flamboro' Cliffs (G.N.). 

 Except for the above-named species of Saxifraga and Crassula, 

 these genera are poorly represented in the .E. Riding. 



628. Sempervivum tectorutn. Linn. 



(House-leek. "Haslock," E.R.D.). 

 Alien. 



Often on old wall tops and thatch in villages ; a big crop 

 on an old cottage in Rudstone village. 



DROSERACE^. 



629. Drosera rotundifolia. Linn., 109. 



(Round-leaved Sundew). 



Native, Brit., 5, 6, 7. July, IV. 



Not common in the East Riding. Skipwith Common 

 (W.N.C. and H.J.W.). Near Market Weighton (J.J.M.). 



630. D. anglica. Hnds., 55. 



(Great Sundew). 



Native, Scot., 5. 



Scagglethorpe, now extinct (M.B.S., who has specimens 

 formerly gathered in this station). 



631. D. intermedia. Hayne., 53. 



(Long-leaved Sundew). 



Native, Eng. , 6, 7. Jub'' ^V. 



Near Market Weighton (J.J.M.). Skipwith (W.N.C. and 

 H.J.W., 1883). Seen by the writer and Mr. C. Waterfall in 

 the years 1899 and 1900 in the latter situation. 



