338 DR. HOOKER ON THE DISTRIBUTION OF ARCTIC PLANTS. 
hardly tangible ; Ledebour, who keeps them distinct, thinks it would be better to unite 
them. Meisner refers domesticus to longifolius, DC, and makes of the Arctic American 
plant the var. nanus. 
R. salicifolius, Weinm. I am doubtful as to the merits of this species, and cannot come 
to any conclusion about it. 
Polygonum polymorphum, Led., is not Scandinavian; but several of its varieties are 
Arctic Siberian and American, as /3. setigerum, y. lapathifolium, and frigidum (P. alpi- 
aum, AIL). 
P. lapathifolium, L. Kept distinct from Persicaria by Pries, Watson, Koch, and 
Bentham ; but I find it impossible to distinguish North Indian specimens of one from 
the other, these being united by every intermediate form. P. Persicaria is, according 
to Pries, very rare in Lapland, and sporadic only. 
Ledebour includes P. Hydropiper as Arctic Lapland on the authority of Pelmann ; but 
I find no confirmation in the works of Pries and Andersson. 
Chenopoditjm maritimum, L., is doubtfully mentioned as a native of the arctic sea-coast 
of America by Richardson. I have examined the specimens ; they are very young, but 
identical with maritimum, which is a common subarctic plant. 
Monolepis Asiatica, Moq. I know nothing of this plant. The only recorded habitats 
I find are both Arctic Siberian, viz. Nishni Kolymsk and the Boganida River. 
Atriplex patula, L., It is impossible to unravel the synonymy and distribution of this 
plant and A. hast at a, if, indeed, they really be distinct, which Moquin doubts. Fries 
keeps one hastata distinct, assigning it a place in the section with rugose seeds. Koch 
distinguishes it by the cordate-triangular (not hastato-rhomboid) sinuate-toothed perigonia. 
Moquin unites angustifolia with it. Bentham unites both these with deltoides, littoralis, 
and erecta. See, for further remarks in reference to the British species, Woods (Proc. 
Linn, for April 17, 1849), who observes that in several species the seeds are of two forms 
in the same individual,— one form slightly depressed, smooth, black and shining; the 
other (in larger lower perigonia) three times as large, more depressed, chesnut and 
wrinkled : he admits angustifolia, patula, deltoidea, and perhaps erecta. On the south- 
east coasts of England, I recognize three very distinct forms, often growing intermixed, 
viz. A. littoralis, L., A. patula, L. (erecta, Huds.), and angustifolia, Smith (all fairly well 
represented in English Botany). Of these the first and last are Arctic European and 
Arctic W. American ; and littoralis Arctic W. American only, though common in tem- 
perate America. 
A. deltoidea, Bab. Moquin refers this to hastata; Fries makes a variety of this 
{prostrata) a native of Lapland ; Watson includes its distribution under that of patula 
(see remarks, « Cybele,' ii. 324). 
A. angustifolia, Sm. Moquin makes of this a synonym of patula ; Watson keeps it 
distinct, but says nothing in its favour ; Koch brings it to patula, and both to latlfolia, 
Wahl. 
A. Gmelini, C. A. M. A little-known plant, referable, according to Ledebour, to patula, 
but rather, I think, to littwalis, L., or perhaps to angustifolia, Sm. 
