DR. HOOKER ON THE DISTRIBUTION OF ARCTIC PLANTS. 32:'. 
Hook.) that the borealisy of 'PL Bor.-Am.' is the same with gracilis, Rich., I. e n and l 
plant of Drummond's, called Larbrea aquatica, and further that all are referable to S. 
umbellata, Turc. 
S. longipes, Goldie. Of the plants brought under this name, S. lata, Ilicli., and Edward. 
sii, Br., are all but universally considered to be identical or st riles. Of Bunge's S. peduncu- 
laris being the same, there can I think be little question. Of S. hebecahjx, Fenzl, and 
ciliatosepala, Trautv., I have seen no authentic specimens ; but, judging from the drawings 
and descriptions, and from specimens in the Herbarium from Labrador, displaying similar 
characters, I have no doubt of these also being mere varieties. Fenzl says that hebecaly.r 
is intermediate between a variety of longipes and Dalutrica /3. Planchon (in Herb. Hook.) 
refers Dahurica to longipes doubtfully ; and Turczaninoff (fid. Rupr. FJL Sam.) regards 
Dahuricafi 2 of Fenzl as the same with glanca, L. The smooth testa of the seed, how- 
ever, distinguishes all the forms of longipes. Durand (Kane's Voy.) refers S. stricta, 
Rich., to longipes /3. minor and B. lata. Planchon (Herb. Hook.) further refers S. imbri- 
cata, Bunge, alpestris, Turc, and Fischeriana, Ser., to longipes, and, I think, rightly. 
The S. glauca of Greenland (LyalTs plants, nob. in Linn. Journ. vol. i. p. 116) is a state 
of this plant. 
S. longlfolia, Fries. A very confusing plant, whether as regards its synonymy or 
limits. I am quite unable to distinguish the European from the American form; 
both have a smooth testa, and seeds otherwise identical. Fries distinguishes them ; 
and Koch (« Synops.' 131) says that longifolia, Muhl., is most certainly distinct, but gives 
no characters. 
S. alpestris is regarded by Fries as a variety, and perhaps a distinct species ; it ap- 
proaches states of uliginosa in many characters ; but the seeds are always smooth. 
Lepigontjm salinum, Fr. This should perhaps be regarded as a member of an aggregate 
species including L. marinum, Wahl., of which Babington considers it a variety, and 
rubrum, Wahl., plants which in their extreme forms differ widely, but seem united by 
innumerable variations ; Bentham unites them. 
Cerastium Msclierianavn , Ser. Buprecht includes a plant of this name, in * Herb. 
Chamisso,' under mdgatum, and further doubts the possibility of distinguishing it from 
arctic forms of C. arvense. Fenzl (in * Led. Fl. Ross.') reduces both this and Beeringia- 
num to vulgatum. Torrey and Gray, and, following these, Durand, refer lischerianum to 
alpinum, and keep Beeringianwm distinct, but next to it in order. 
C. arvense, L. Ruprecht gives the only arctic habitat for this, viz. the extreme forest- 
limit in Samoiedland, but he gives its var. /3 {arvense, incamm, Led.) as abundant in 
sandy places on the arctic Island of Kolgujew. 
Folygala vulgaris, L. I hesitated long whether to amalgamate the distribution of 
this with the Siberian P. comosa, but have refrained. 
Astragalus polaris, Benth. ; glaber v, parce pubescens, caule breviter diffuso, stipulis 
postice concretis, foliolis 11-15 ovatis oblongisve returns v. emarginato-bifidis, pedun- 
culis folio subaBqualibus apice 1-4-floris, calycis dentibus tubo paullo brevioribus, 
corolla calyce subtriplo longiore, carina alis vexilloque breviore, legumine subsessili 
VOL. XXIII. 
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