DISTRIBUTION Otf BRITISH PLANTS. 349 



known under the different names of Corallorhiza innata, 

 Cymbidium corallorhizum, and Ophrys corallorhiza. 



A few more plants of the same Scandinavian type reach 

 the north of England, as Dwarf Cornel (Cornws Suecica) 

 another Arctic Zone plant ; the involucre which surrounds 

 the little blossoms looks like a corolla of four petals ; Linnata 

 borealis, which we have also met with before, and one which 

 we remember in the forests of Siberia, called Chickweed 

 Wintergreen (Trientalis JEuroptea), a rare and beautiful 

 flower of the Primrose family. 



Only a few plants of this type are found on the Welsh 

 mountains, but amongst these few are some of the most 

 characteristic, as Alpine Rock-cress (Arabispetraa), a Mouse- 

 ear Chickweed (Cerastium alpinum), with blossoms rather 

 large in proportion to its humble height of some three or 

 four inches, the rare orange Alpine Cinquefoil (Potentilla 

 alpestris], Hairy Stonecrop (Sedum villosum). Two Saxi- 

 frages, Saxifraga muscoides, a starved-looking little plant, 

 with but a few flowers on a very short stalk, the leaves 

 lying close to the ground ; and S. nivalis, which, in contrast 

 to the last, has clusters of blossoms on a stalk sometimes 

 eight inches high ; Alpine Meabaiie (Erigeron alpinum), two 

 little Willows only two or three inches high (Salix reticulata 



