Beiblatt zu den Botanischen Jahrbüchern. Nr. 70. 15 
8. Association. 
Pycnophytia (zoxvoc, thick, close), closed formations. 
Sporadophytia (stops, 460, ó, 4, scattered), open formations. 
9. Development. 
Proodophytia (rpoodoz, 7, advance, pioneer), initial formations. 
Ptenophytia (xzrvóc, winged, passing), intermediate formations. 
Aiphytia (at, ever, permanent), stable (ultimate) formations. 
III. Phytogeographical Divisions of North America. 
Hemisphaera septentrionalis — Northern hemisphere. 
Zona polari-nivalis — Polar-niveal zone. 
Zona arctico-alpina — Arctic-alpine zone. 
Provincia arctica — Arctic province. 
Provincia alpina — Alpine province. 
Zona boreali-subalpina — Boreal-subalpine zone. 
Provincia alaskana — Alaska province. 
Provincia cordillerana — Cordilleran or Mountain province. 
Provincia ontariensis — Ontario province. 
Zona temperata — Temperate zone. 
Provincia atlantica — Atlantic province. 
Provincia appalachiana — Appalachian province. 
Provincia nebraskensis — Nebraska province. 
Regio missouriensis — Missouri or Prairie region. 
Districtus elkhornensis — Elkhorn district. 
Districtus plattensis — Platte district. 
Districtus nemahaensis — Nemaha district. 
Regio arikareensis — Arikaree or Sandhill region. 
Districtus niobrarensis — Niobrara district. 
Districtus loupensis — Loup district. 
Districtus republicanus — Republican district. 
Provincia utahensis —- Utah province. 
Regio nevadana — Nevada region. 
Regio mohavensis — Mohave region. 
Provincia litoralis — Coast province. 
Regio columbiana — Columbia region. 
Regio californica — California region. 
Provincia pacifica — Pacific province. 
Zona subtropicalis — Subtropical zone. 
Provincia floridana — Florida province. 
Provincia mexicana — Mexico province. 
Zona tropicalis — Tropical zone. 
Provincia antilleana — Antilles province. 
Provincia andeana — Andean province. 
