DR. HOOKER ON THE DISTRIBUTION OF ARCTIC PLANTS. 317 
pods short, elliptical, sharp at both cuds, and few seeds. It is, on the other hand, ven 
near muricella and rupestris, and to small forms of hirta. I have it both from the Rockj 
Mountains and Lapland. 
D. corymbosa, Br. Durand doubtfully refers this to his var. cori/mbosa of alpha 
alpvnal, Hook.). The figure of the Greenland plant in 'Flora Daniea ' appears to 
belong to a common arctic form of androsacea. 
Draba muricella, Wahl. This Mr. Ball distinguishes from D. stellota, Jaeq., which is 
nowhere found in the arctic regions. D. muricella, Wahl., on the other hand, has not 
been found in Middle or Southern Europe. It is the D. niralk, Lilj., non DC. Durand 
(Kane's Voyage) refers the D. rupestris, var. /3, of Torres and Cray to nivalis, Willd., 
apparently from description only. 
Draba stellata, Jacq., non DC. Mr. Ball is my authority for including D. Johanuis, 
Host. 
Draba hirta, L. I have Mr. Ball's authority for including Dovrcnsis, Fr., and 
arctica, Vahl, under this plant. I have no confidence in its permanent distinction from 
D. incana. It is usually a much less leafy plant, with longer pedicels in comparison to 
the pods. 
D. oblongata, Br., is apparently founded on a small specimen of J), hirta. 
Draba incana, L. D. contorta, Ehr., and confusa, Ehr., are now generally considered 
to be forms of this ; and I find them to be scarcely distinguishable as varieties. 
-D. Magellanica, Lamk. I have already (' Flor. Antarct.' ii. p. 233) referred this to 
incana ; and a fresh series of specimens, received since that time, not only confirm 
this opinion, but incline me to regard D. Falklandica, mihi, as a mere stunt< I form. 
-Z). borealis, DC. I have examined two specimens of this, communicated by Prof. 
Fischer ; and it appears to be nothing but a rather luxuriantly leafy form of I). 
incana ; the specimens have not ripe fruit, however. 
Draba rupestris, Br. It is extremely difficult to distinguish this from small states of 
lactea, hirta, and incana, and in some cases from D. muricella. D. Altaica, Bunge, is clearly 
a synonym. Durand refers here the X>. hirta, E. Bot., and hirta, var. 4, of Fl. Bor.-Am. 
Bentham refers the British rupestris to hirta, 
Draba aurea, Vahl. This is a very puzzling plant, so like in its normal state to J). 
incana, that I do not see how these plants can be distinguished, except by the colour of the 
flower, which, again, apparently varies to white. I am not aware of any yellow-flowered 
Draba with the habit of incana being found, except in Labrador, Greenland, and the 
Rocky Mountains. 
Cochlearia. This has always proved to me to be one of the most intractable boreal 
genera ; and I do not believe that the common littoral forms are always defineable speci- 
fically. Habit, pods, and leaves afford the characters hitherto made use of; and all 
are equally fallacious, as far as affording permanent distinctions. 
Ruprecht, speaking of the Samoied forms (Flor. Samojed. p. 21) says of C. Wahlen- 
bergii, Rup. {anglica, Wahl., non L.), C. oblon gifolia , DC, C. arctica, DC, C. fenestrate 
Br., C. Daniea, L., " Quod reliquum est, vereor, ne Cochlearia? omnes hie enumeratae ad 
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