294 l^R- J- W. HRSLOP HARRISON ON 



(9) R.puiipinellifolia X R. tomentosa var. sylvestris. Plate XIV. 



The present plant grows in a shady lane leaditig from 

 Hawthorn Dene to the village of Hawthorn, Co. Durham, and 

 was first observed on August 13th, 1919. 



Unlike the previous specimens we have brought under 

 examination, it was a drawn-up, feeble-looking plant, and 

 differed most obviously from all the other hybrids of the 

 group in my possession by its bright green, heavily glandular 

 foliage. At the date in question, its unripe hips were just 

 commencing to fall. This suffices, in itself, to indicate that 

 its second parent was not the R. mollis or R. omissa of the 

 Corbridge and Slaley plants. Independently of this the 

 Villosce. and Tomentosce were but weakly represented in micro- 

 genes in the vicinity, although, just as in other coast denes, 

 R. mollis covered acre after acre, and excelled any other form 

 in individuals. The only Tomentosa variety about was R. 

 tomentosa var. sylvestris, and this coincided in colour and 

 type of foliage, and in gland and prickle development with 

 our plant. In a flora one would see it determined as R. 

 gracilis, so that if all plants passing under that name are 

 genotypically alike they are derived from a crossing between 

 R. pimpinellifolia and R. var. sylvestris. 



(10) R. mollis X R. camna {forma?) Plate XV. A. 



Without very close inspection, in the form of its glabrous 

 leaflets, the flexuose nature of its internodes, the more or less 

 reflexed sepals, this plant has a strong canina look 

 Examination of the setose fruit and peduncles, its woolly 

 flattish head of stigmas, its copiously compound serrate 

 leaflets, its dilated stipules, just as strongly insists on the 

 influence oi R. mollis, whilst the prickles are a very obvious 

 compromise between prickles of the straightish, thin mollis 

 tvpe and the stout uncinate ones of the typical Eucanine. Alto- 

 gether, the plant is a good intermediate between the plants 

 named. 



