DR. HOOKER ON THE DISTRIBUTION OF ARCTIC PLANTS. 335 
Phlox Bichardsonii, Hook. This appears to me only an arctic tufted form of P. Sibi- 
rica, to which, I think, may also be referred P. Douglassii ; all have more or less, and 
often strongly, recurved margins to the leaves ; and the other differences are comparative 
and trifling. 
Myosotis alpestris, Sw. {suaveolens, M. & K.). Fries and Koch merge this into a 
variety of sylvatica, which alone inhabits Lapland. Bentham takes the same view. Watson 
retains it, finding that it keeps its characters well under cultivation. 
M. caspitosa, Schltz. This Bentham unites with palnstris, and probably correctly. 
M.arvensis, L. (intermedia, Link.). Watson finds this occasionally approximating to 
ccespitosa ; and I find it difficult to separate northern forms of one from the other. 
Eretrichitjm villosum, Bunge. K aretioides, A. DC, is nothing but a dwarf arctic 
state of this. Ledebour unites E. latifolium, Rupr. (non Kar. & Kir.), with the same, as 
var. /3 ; and so does Trautvetter (Flor. Taimyr.) . 
Mertensia pilosa, DC, which includes Lith. corymbosum, Lehni., and paniculaium, 
Don, is clearly referable to denticulata, Don, the hairy calyx being a very inconstant 
character. These should possibly all be united under Sibirica. 
M. Drummondii, Don. I find no plica? in the tube of the corolla of this plant, whence 
it must be removed from the section in which DeCandolle places it to that with 7 irg 
of which it appears to be a northern form, as suspected in < Flora Bor.-Am 
It 
has not, however, been gathered anywhere between the Arctic Sea-coast and the United 
States 
Both 
Mentha Zapponica, Wahl., is referred by Fries to a northern variety of arvensie. 
grow in Lapland. 
Galeofsis Tetrahit, L. Fries and Koch keep this distinct, as does W«tooa, who gives 
as presumptive evidence in its favour the statement that the seeds of verncolor yield 
plants of their own kind only. Bentham says that they graduate one into the other. 
Stacks^™, L. According to the synonyms quoted by Asa Gray, this ^ A™ 
Plant includes many very divergent forms, including some that mighty a most he ^lefcrred 
to S. syUatica. Under the latter plant I have not introduced the Chilian S. cko.oUco, 
which approaches it closely. 
I™ 0SELlA aq uatica, L. I include under this L. tenu^a, which is the more common 
southern form, and certainly is nothing but a variety with reduced foliage. X. to, eat*, 
Messing, is another form, found in Lapland only, accordmg to 1 nes. 
■r, -j. ,„Kia tr, <li<itm<niish Stelleri and Pallami, 
Gymxandra borealis, Pall. I am quite unable to < «>« 
which were included originally by Pallas under horeo.hs. Choisv ajs in 
24, that it is difficult to dissent from Pallas's view, who regaraedthe genu, as wnoyp*. 
Willdenow makes eight species, which Chamisso and Schlechtendal leduce thiee. 
Ca STIMJA septeutrionolis, Lindl. I have no hesitation in uniting this with pIKda, 
as suggested < in Flor. Bor.-Am.' It advances south to Canada. 
