INTRODUCTION 
XXXlll 
Natural Orders of twenty Species and upwards in the 
Flora of Simla. 
Orders 
Genera 
Per cent. 
Species 
Per cent. 
Eanunculaceae 
12 
1*9 
33 
2-5 
Cruciferae 
11 
1-7 
23 
1-7 
Caryophyllacese 
12 
1-9 
25 
1-8 
Geraniaceae 
4 
06 
20 
1-5 
Leguminosae . 
45 ■ 
7-0 
114 
8*6 
Eosaceae .... 
12 
1*9 
42 
3-2 
Umbelliferae . 
14 
2-2 
26 
2-0 
Eubiaceae 
13 
2-0 
23 
1-7 
Compositae 
59 
9-2 
109 
8-2 
Scrophulariaceae 
24 
3-7 
40 
3-0 
Labiatae .... 
29 
4*5 
59 
4-4 
Polygonaceae . 
3 
0-5 
23 
1*7 
Euphorbiaceae 
12 
1*9 
22 
1-7 
Urticaceae 
16 
2-5 
35 
2*6 
Orchidaceae 
18 
2-8 
38 
2-9 
Liliaceae .... 
18 
2-8 
32 
2-4 
Cyperaceae . . . 
12 
1-9 
56 
4*2 
Gramineae 
58 
9*1 
133 
10-0 
Totals :• — 18 orders, or 
16*0 per cent. . 
372 
58*2 
853 
64*3 
I will conclude these comparisons with some figures relating 
to species and genera. Some years ago I compiled 1 a series of 
calculations of the relative generic and specific composition of 
the floras of different areas, a few of which may be reproduced 
here for comparison with the Mora of Simla. Of course these 
figures are only rough approximations for the world and the 
larger areas, but for the smaller areas they are almost exact. 
Regions 
Average number 
of Genera to an 
Order • 
Average number 
of Species to a 
Genus 
World . . . . . 
37-50 
12*65 
India ...... 
13-0 
6*0 
Mexico ..... 
11*0 
6*4 
N. America .... 
9-6 
6-2 
Australia ..... 
8*7 
6*4 
Simla . . . . . 
5:6 
2*0 
St. Helena .... 
1*4 
1*0 
Biologia Centrali-Aviericana, Botany, vol. i. Introd. (1888), p. xxiii. 
b 
