276 
J. ARTHUR HARRIS AND JOHN V. LAWRENCE 
A habitat in which such introduced forms as Daucus Carota, 
Pastinaca sativa and Plantago lanceolata thrive, and in which occurs 
a number of species common to this and one or more of the hygrophy- 
tic habitats, can hardly be regarded as truly xerophytic. 
The determinations from the ruinate are given in the accompanying 
protocol. 
Since the data are presented in a uniform way for the four habitats, 
an explanation of the form of these lists may be given here. 
The plants are first of all divided into ligneous and herbaceous. 
Under each of these groups the species are, for convenience of reference, 
arranged alphabetically. The values of A and P opposite the species 
names are averages whenever more than a single determination for 
the species could be secured in the habitat. In such cases the values 
are designated by bars, A and P, the individual determinations upon 
which these averages are based with their dates of collection are given 
beneath the species name and its average constants for the habitat 
in question. In cases in which only a single determination could 
be secured, the values of A and P are given, with the date of collection, 
in place of the average value. 
Ligneous Plants 
Asclepias physocarpa (E. Meyer) Schlecht. 
Feb. 
28, A = 0.86, P 
10.4 
Baccharis scoparia (L.) Sw. 
A = 1. 18, P 
14.2 
Feb. 6, A = 1. 10, P = 13.3; Feb. 18, A = 
i.i5,P = : 
[3.8; Feb. 24, A 
1.28, 
P = 15.4. 
Bidens incisa (Ker.) G. Don 
Feb. 
7, A = 0.91, P 
II. 0 
Bocconia frutescens L. 
A 0.91, P 
II. 0 
Feb. 5, A = 0.82, P = 9.9; Feb. 28, A = 
0.99, P — ] 
[2.0. 
Borreria verticillata (L.) Meyer 
Feb. 
5, A = 0.68, P 
8.2 
Caesalpinia sepiaria Roxb. 
A = 0.97, P 
11.7 
Mar. 6, A = 0.95, P = 11. 5; Mar. 6, A = 
= 0.98, P = 
II. 8. 
Cestrum odontospermum Jacq. 
Mar. 
6, A = 0.99, P 
I1.9 
Citharexylum caudatum L. 
Mar. 
18, A - 2.03, P 
24.4 
Coffea arahica L. 
Mar. 
6, A = 1.29, P 
15-5 
Cracca grandiflora (Vahl.) Kuntze 
Feb. 
5, A = 0.85, P 
10.3 
Crotalaria Saltiana Andr. 
Feb. 
8, A = 0.82, P 
9-9 
Dodonaea jamaicensis DC. 
A = 1. 18, P 
14.2 
Feb. 5, A = 1.05, P = 12.7; Feb. 7, A = 
1.09, P = 13. 1 ; Feb. 26, A ■■ 
1.41, 
P = 16.9. 
Duranta repens L. 
A = 1.26, P 
15-2 
Feb. 28, A = 1.29, P = 15.5; Feb. 28, A = 
- 1.25, P = 
15.0; Mar. 6, A : 
1.25, 
p = I5.I. 
