77 



Plants f Q-ii.ad in. ] larBJ i at Bfilr'lnn . 



t 



.Eloides campanulata Marsli St. Johnsv/ort. 

 Habenaria bleplmrielottia V/iiite f ringed-orchid. 



Lecture 17. Anp:\ist R. 1900. 

 Classification of riant Societifis . 

 Drude's Handbook of Plant Geograpiiy, 1G90, purely geographical. 

 ]^nirlrr and Drude : Veeetation der ]^rde, to be in a hundred volumes 

 only a few having now been published. 



In lo9r Vi/armiiie — Danish — published " Plant es arafund." In this 

 the. classification based on the water conditions of the soil. 

 In 1898 — Schimper — uses as his principal clasnif icatlon, in dividing 

 the world, l^eg-t . Torrid, temperates, Arctic, llountain and Water. 

 V/arraing's id a classification in the small, Schimper 's in the large. 

 The latter divides each of his sones as forest, grassland and deserts, 

 which are "determined by climatic causes. Peat bogs, dimes, etc. 

 are determined by edaphic causes. 



liilsson and other Ccandinaviarian writers are working along ecological 

 lines. Graebner in 1898 pxiblished a pamphlet which classified 

 according to chemical food stuffs of the soil. In attempting to 

 place the flora- of North America according to Vferming's classification, 

 a difficulty is found in peat bogs. The real troiible of 'Warning's 

 plan is that he b&ses all uponofie factor, wat.ex. 



