ITT. 
IV. 
126 Monren 
Poland, Niosikop 
Sweden, Vastervik, Liebmann 
Lapland, Lulea, Deinboll 
Finland, Abo, Holmén 
Poland, Debelowo, Raciborski 
Lapland, Bosekop, Warming ............. 
— Hartmann. ere 
Sakkabani, Warming ........... 
Iberia Inter, lune 5550 550e1ooocen ens 
Germany, Brandenburg, A. Lange 
— 1 
Austria inferior, Spritzenhofer 
Lange 
Beg EES. Wo IDE. Goo ad oeaoso nunc 
niMlenil, INGUIN. oe goleen dodgers mos sone 
Swen, IEMINEINS oon ogonopase ceqbodseu- 
Russia, White Sea Island, Pohle 
Average of 184 measurements 
P,. Porsitp. 
on 32 
SHOGCOMMEN MIS Soe oe momo concae oe 
Results of the investigations. 
Summarizing the results of the measurements listed above, 
a LE 
specimens, 290 measurements 7—12,79—21 
. L. decumbens, Arctic America 
decumbens, Greenland 40 1 
and Siberia 11 specimens, 68 
LOMERISWUIRAINA NI 4 sos o5a5a5n5 
L. groenlandicum, South Green- 
land 40 specimens, 308 measu- 
RAIA 5 4 oudipotenadcsoadads 
L. groenlandicum, Boreal Ame- 
rica, 8 specimens, 50 measure- 
TINEMUS pacts sty see tes, wet = « 27,77 
. L. palustre, Boreal Europe 32 
15—27,30 
specimens, 184 measurements 
4 
5 
11—20,04—35 
N L b bl 
5 18.1 2.1 % 62 
a) 52,0 Shy 8.65 
G2 Ui s4 8,82 
10 33,7 3,8 8,87 
9) 19,0 2,1 9,05 
6 19.9 2,2 9.07 
6 19,6 2,1 9.33 
6 20.0 re | 9.52 
6 31,0 aes 9.67 
6 2285 PA 983 
5 20.0 1,9 10,52 
5 26:6 2.5 10,64 
5 43.0 af Liebe 
aye Paifesl) ol WS 
5 35,2 2S Ly 
LOM aco 1,6 14,56 
27,20 3.24 8,41 
we find: 
b lb 
1—1,85—3 3—6,91—11 
1.80 8.03 
BSR pe 
8,83 > 3.14 
1.5=— 3:04 —6 5= S415 
By comparing the lists I and III we see that the two Greenland 
species of Ledum in the great majority of cases will easily 
be distinguished by the shape of the leaves alone, L. groen- 
landicum being — as was known before — a more broad-leaved form. 
However, we must admit that in some cases the lists overlap, i. e. there 
