INTRODUCTION 
XXX111 
Natural Orders of twenty Species and upwards in the 
Flora of Simla. 
Orders 
Genera 
Per cent. 
Species 
Per cent. 
Ranunculaceae 
12 
1-9 
33 
2-5 
Cruciferae . 
11 
1*7 
23 
1*7 
Caryophyllaceae . 
12 
1*9 
25 
1*8 
Geraniacese 
4 
0-6 
20 
1-5 
Leguminosae 
45 
7*0 
114 
8*6 
Rosaceae 
12 
1*9 
42 
32 
Umbelliferae 
14 
2-2 
26 
20 
Rubiaceae . 
13 
2*0 
23 
1-7 
Composite . 
59 
9-2 
109 
8-2 
Scrophulariaceae . 
24 
3*7 
40 
30 
Labiatae 
29 
4*5 
59 
4-4 
Polygonaceae 
3 
0*5 
23 
1-7 
Euphorbiaceae 
12 
1*9 
22 
1*7 
Urticaceae . 
16 
25 
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 
9T 
133 
io-o 
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 Flora 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 .... 
3750 
12*65 
India .... 
130 
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 
1 Biologia Centrali- Americana, Botany, vol. i. Introd. (1888), p. xxiii. 
C 
