262 DN_THE DISPERSION Of MONTANE PLANTS 



of Yorkshire, oi- of the range of Limestone hills that bounds the Slate hills 

 of the lake country on the south, sti'etching from Kendal westward, past 

 Milnthorpe and Arnside Knot, to the coast at Silverdale and Humphry 

 Head ; all of which are similar in their litliology and botany to tract No. 

 2, and yield very few additional species. 



Lid of Species. 



1. ThaUctriim alpinum. Unknown in the Porphyry and Oolite. In 

 the Slate on high damp crags of Helvellyn, Fairfield, and the Scawfell 

 group of summits. In the Carboniferous tract confined to the super- 

 agrarian basaltic crags of Teesdale. 



2. Thalictruin minus, var. montannm. Unknown in the Porphyry and 

 Oolite ; in the Slate, on a few superagrariau crags of the Skiddaw group 

 only ; in the Carboniferous tract in one place only in Arkendale, on a 

 limestone scar. Var. fleXHOsiim, in the Slate tract frequent amongst the 

 large lakes ; in the Carboniferous tract scattered through the JMidagrarian 

 zone in Teesdale, but not known in any of the other valleys ; unknowu 

 among the Porphyry and Oolite. 



3. Trollius europceus. Occurs more or less plentifully in all the four 

 tracts, ascending in Teesdale to the Inferarctic zone. 



4. Thlaspi alpestre. Unknown in the Porphyry and Oolite. Reported 

 doiditfully or on doubtful authority from two places in the Slate district, 

 and requiring confirmation before it can be accepted. In the Carbonife- 

 rous tract, known in a dozen or more good stations, always about lead- 

 mines, ranging in level from 100 to 750 yards. 



5. Siibidaria aquatica. Unknown in the Porphyry, Oolite, and Car- 

 boniferous tracts. In the Slate district in two of the large lakes. 



6. Draha incaiia. Porphyry and Oolite unknown. Slate, reported 

 from a single station on doubtful authority. Frequent in the Carbonife- 

 rous tract on the high limestone cliffs in all the dales from the Wear to 

 the Yore. 



7. Arabis petraea. Unknown in the Porphyry, Oolite, and Carbonife- 

 rous tracts. In the Slate district in two stations amongst the Scawfell 

 group of summits. 



8. Viola latea. Occurs in all the four tracts ; in the Oolite in two 

 places only ; much more plentifully in the Carboniferous tract than in any 

 of the other three. 



9. Drosera amjUca. Unknown in the Porphyritic and Carboniferous 

 tracts. Two stations each in the Slate and Oolite. 



10. Silene acaidis. Unknown in the Porphyry, Oolite, and Carbonife- 

 rous tracts. Several stations amongst the higher peaks of the Slate 

 country. 



11. Lychnis alpina. Unknown in the Porphyry, Oolite, and Carbonife- 

 rous tracts. In the Slate district near the summit of one of the peaks of 

 second-rate height, at about 2000 feet. 



12. Arenaria verna. Universally distributed amongst the hills and 

 dales of the Carboniferous tract, ascending to the Inferarctic zone. In 

 the Slate known in two places only on precipices of the Inferarctic zone. 

 Unknown among the Porphyry and Oolite. 



13. Arenaria uliyinosa. In the Carboniferous tract on one hill in 

 Teesdale at 5-600 yards. Unknowu in the other three districts. 



