130 ESSAYS. 
Lamium, Ligustrum, Kochia? Daphne, Thesium, Buxus, 
Mercurialis, Cephalanthera, Paris, Asparagus,—to which 
may as well be added Pzonia and Bupleurum, the former 
having a representative on the mountains, and the latter in 
the arctic regions, of western America, but both absent from 
the rest of our continent. Excepting Pederota and Buxus 
(the latter a rather doubtful native of eastern Asia), none 
of these genera are peculiar to Europe, but all extend 
throughout Asia and elsewhere over large parts of the world. 
The following incomplete list of North American genera 
or peculiar subgeneric types represented in Japan and its 
vicinity, but unknown in Europe, presents a very different 
appearance. 
North America are italicized. 
Trautvetteria Philadelphus Asarum, § Heterotropa 
Cimicifuga (barely Penthorum Phytolacca 
reaches Europe) Hamamelis Benzoin and Sassafras ? 
Lilicium Liquidambar Tatranthera 
Magnolia Cryptotenia Saururus 
Cocculus and Meni- Cymopterus ? Pachysandra 
spermum ? Archemora Laportea 
Mahonia Osmorrhiza Pilea 
Caulophyllum Aralia and § Ginseng Behmeria 
Diphylleia Echinopanax Microptelea 
Brasenia Diervilla Maclura 
Nelumbium Mitchella Juglans 
Dicentra Oldenlandia Abies, § Tsuga 
Stuartia (& Gordonia?) (Siegesbeckia, in Chamecyparis 
Zanthoxylum Mexico) Torreya 
Cissus Cacalia (reaches Ariscema 
Ampelopsis E. Europe) Arctiodracon 
Berchemia Gaultheria Pogonia 
/Eseulus Leucothoé Arethusa 
Sapindus Pieris Dioscorea 
Negundo Clethra Aletris 
Thermopsis Menziesia Coprosmanthus 
Wistaria Symplocos Trillium 
Desmodium Ardisia Clintonia 
Lespedeza Boschniakia Streptopus, § Hekori- 
Rhynchosia Catalpa ma 
Sophora Tecoma Chameelirium ? 
Photinia Dicliptera Sporobolus 
Those which are absent from the flora of western 
