DR. HOOKER ON THE DISTRIBUTION OF ARCTIC PLANTS. 
269 
Populus tremuloides. 
Picea nigra. 
Spiranthes gracilis. 
Cypripedium acaule 
Carex oligosperma. 
Pleuropogon Sabini. 
land 
Of these Douglasia and Pleuropogon are the only ones absolutely peculiar to Arctic 
It is a noticeable fact that not one of them is found in any part of Green 
East America 
Compared with Greenland, the Arctic East American flora is rich ; containing 
besides those just enumerated, no less than 165 other species not found in G 
The following are found on the arctic islands, and many of them on the west coast of 
Baffin's Bay, but not in West Greenland : 
Caltha palustris. 
Parry a arctica. 
Merkia physodes. 
Stellaria crassifolia. 
Astragalus alpinus. 
Oxytropis campestris 
Ural 
Ptarmica vulgaris. 
Chrysanthemum arcticum 
Artemisia vulgaris. 
Senecio frigidus. 
palustris. 
pulchellus. 
Pedicularis capitata. 
versicolor. 
Androsace septentrionalis. 
Chamaejasme. 
ensis. 
nigrescens. 
Sieversia Rossii. 
Saxifraga hieracifolia. 
Virginiensis. 
Hirculus (East Greenland 
only) . 
Valeriana capitata. 
Nardosmia corymbosa. 
There are thus 
half) which are 
Solidago Virga-aurea. 
Aster salsuginosus. 
Crepis nana. 
Saussurea alpina. 
Andromeda polifolia. 
Arctostaphylos alpina. 
Kalmia glauca. 
Phlox Sibirica. 
Castilleja pallida. 
Salix phlebophylla. 
Lloydia serotina. 
Hierochloe pauciflora. 
Deschampsia caespitosa (East 
Greenland only). 
Glyceria fluitans. 
Pleuropogon Sabini. 
Bromus purgans. 
Elymus mollis. 
fewer than 184 of 
379 Arctic East American species (fullv 
absent in "West Greenland, whilst only 105 (much less 
are absent in Europe. This alone would make the limitation of species in the meridian 
oi Baffin's Bay more decided than in any other arctic longitude ; and I shall show that 
it is rendered still 
decisive by the number of Arctic Greenland plants that do 
cross to Arctic East America. 
Of the 379 Arctic East American species only 56 are not found in Temperate East 
America, of which two are absolutely confined to this area ; two others (Parry a arenicoln 
and Festuca Richardsoni) to Arctic East and West America ; 25 are found in Temperate 
West America, and about 20 are Rocky Mountain species, and not found elsewhere in 
Temperate America. 
Eor our knowledge of this flora I am principally indebted to the * Elora Boreali- Ameri- 
cana,' and to Richardson's * botanical appendix to Franklin's first voyage — and his 'Boat 
Journey through Rupert's Land.' I have also examined the materials upon which the above 
works were founded, and the collections of almost every subsequent journey and voyage, 
up to those of Dr. Walker in the ' Pox.' To enumerate the numerous botanical appendices 
to voyages, and separate opuscules to which these have given rise, from Ross' first voyage 
to the present time, would be out of place here. I have endeavoured to embody in the 
I am indebted to Sir John Richardson for some corrections to this list, which account for a few discrepancies be- 
tween his lists of Arctic American plants and my own ; these refer chiefly to genera and species introduced into his 
hsts, but here excluded. 
2o2 
