260 PHANEROGAMOUS PLANTS. 



agencies, form, in the midst of the nevt, tiny flowering par- 

 terres oases in the desert, islands in the vast ocean of ice and 

 snow. There, sheltered by the rocks, and warmed by the sun, 

 and refreshed by the snow, which rapidly melts in summer, 

 these pretty plants thrive and grow beautiful, though their brief 

 existence is summed up in a few short weeks. 



According to Charles Martins, the phanerogamous plants 

 which flourish at an elevation of 10,000 feet are the fol- 

 lowing : 



Mean temperature, 47 to 36. 



1. Gentian a verna. 



2. Silena acaulis. 



3. Draba frigida.* 



4. Draba fladnizensis. 



5. Cardamine bellidifolia. 



6. Cardamine resedifolia. 



7. Potentilla frigida. 



8. Phyteuma hemisphericum. 



9. Pyrethrum Alpinum. 



10. Erigeron uniflorum. 



1 1 . Saxifraga bryoides. 



12. Saxifraga Groenlandica. 



13. Saxifraga muscoides. 



14. Saxifraga oppositifolia. 



15. Androsace Helvetica. 



1 6. Androsace pubescens. 



17. Lazula spicata. 



1 8. Festuca Halleri. 



19. Poa laxa. t 



20. Poa caesia. 



21. Poa Alpina. 



22. Trisetum subspicatum. 



23. Agrostis rupestris. 



24. Carex nigra (Cariceae). 



THE PIMPERNEL. 



Accompany me to the corn-field; not for any discourse 

 upon the state and prospect of the crops, or on the compara- 

 tive value to man of wheat or barley, but for the sake of the 



* Draba aretoides has been found on Chimborazo at 1 6,000 feet. 

 t Poa annua grows at an elevation of 7400 feet. 



