750 METASPERMAE OF THE MINNESOTA VALLBY. 
Passing next to the habitat elements a similar table of range 
statistics may be considered. 
AQUATICS. MARSH-PLANTS,. || DRIER-SOIL PLANTS. 
g| 3] 6 g| 3) 4 g | $3] 6 
3 e 3 a 
39. Rance-Staristics | § 21s x 218 x & By 
OF THE 3 e Kd cae il aie 2 
HABITAT-ELEMENTS. S E g e 8 g > E 3 
8/3/38) 4/818] 8) 413/818] 2 
a} 3/8/12] 2/3/28) 2] 8/3] 2] 3 
S) q © i} ° eB] O2| 6 Sj a © ° 
Sai/</2/a] 4/4/44] a] a a4)/2ig 
Northern species......... 26 | 10 5 | 41 |119 [52 33 |204 81 |195 |121 |397 
Southern species... 25 | 14 5 | 44 |] 82 {386 |84 |152 || 122 |294 |280 1/696 
Eastern species...........] 82 | 17 8 | 57 }i41 |64 [51 [256 | 137 [315 [257 |709 
Western species.......... 23 | 10 5 | 38 | 80 |41 132 {1583 73 = |178 |161 |412 
Percent. of all northern,| 63.4} 24.3} 12.3/100. || 58.3/25.4/16.3/100. | 20.4) 49.1) 30.5)100. 
Per cent. of all southern.| 56.8] 31.8} 11.4100. || 53.9)/23.6)12.5/100. 17.5) 42.2) 40.3/100. 
Per cent. of all eastern...| 56.1) 30.0] 13.9)100. |) 55.0/24.6/10.4|/100. || 19.3) 44.4) 36.3/100. 
Per cent. of all western..| 60.5] 26.3] 13.2/100. | 52.2) link 100. i7.7| 43.2) 39.1)/100. 
North’rn percent of each) 81.2) 58.8} 62.6) 71.9] 82.0/80.0/61.1) 77.2) 51.5) 51.7) 37.8} 47.7 
Southern per cent.of each] 78.1) 82.3] 62.6) 77.1] 56.5 Leip 57.5] 77.7] 77.9) 87.7) 81.5 
Eastern per cent. of each}100. |100. |100. |100. || -97.2/98.4/94.4) 96.9] 87.2} 83.5) 80.5) 83.1 
Western percent. of each] 71.8] 58.8} 62.6] 66.6) 55.1,63.0/59.2) 57.9] 46.4) 44.5) 50.4) 48.1 
Total species........... 32 | 17 8 | 57 145 [65 [54 (264 | 157 [377 {819 |853 
From the above table it is seen immediately that the aquatic 
plants are more general in their continental distribution than 
the marsh and swamp plants and these in turn more generally 
distributed than the drier-soil plants. |The aquatics, however, 
are strongly eastern, presenting indeed their total number in 
this range; the marsh and swamp plants are only less eastern 
while the easternness of the drier-soil plants is the least of the 
three. The marsh-plants lead in northernness while the drier- 
soil plants excel in southernness. In westernness the ratios are 
similar to those of easternness, owing to the differences of 
general distribution. Comparing each element with the total 
flora we may note first the aquatics. 
The aquatic element exceeds the total flora in all four ele- 
ments of range. This indicates, in an accurate and instructive 
manuer, the widely distributed character of aquatic plants. 
The southern per cent. of aquatic Metachlamydeae is, however, 
less than the southern per cent. of all Metachlamydeae, while 
the northern per cent. is considerably greater. Again there is 
