288 BOTANICAL GAZETTE [OCTOBER 
species, or upon cacti. Here, as is generally the case in desert 
regions, the classification of the plants with respect to growth 
form presents considerable difficulty. Trees are shrublike in stat- 
ure and shrubs are correspondingly reduced in size. In spots where 
the soil is deeper or more retentive of moisture the size of the 
individuals may be much greater. 
Describing the vegetation in terms of the species upon which we 
were able to secure determinations, we may note that the vegeta- 
tion of the coastal flats is made up chiefly of a mesquite tree Prosopis 
juliflora, and a columnar cactus Lemairocereus Hystrix. Other trees 
or shrubs are Caesalpinia vesicaria, Capparis cynophallophora, 
C. ferruginea, and Guaiacum officinale. Our lists show determina- 
tions for 7 species of cacti. In addition to these, Sesuvium Portu- 
lacastrum, Batis maritima, and in places Bromelia Pinguin are 
abundant. On the rocky hillsides the more truly arborescent forms 
are Bauhinia divaricata, Caesalpinia vesicaria, Canella Winterana, 
Capparis ferruginea, Cassia emarginata, Ichthyomethia Piscipula, 
Melicocca bijuga, Prosopis juliflora, Sarcomphalus Sarcomphalus, 
Schoepfia chrysophylloides, and Tamarindus indica. The shrubs are 
Chiococca alba, Croton flavens, Hypelate trifoliata, Lantana crocea (?), 
Morinda Roioc, Solanum bahamense, and Turnera ulmifolia. The 
smaller ligneous species are the dwarf shrubs or half shrubs 
Achyranthes halimifolia, Lantana reticulata, and Jatropha gossyp- 
folia, and the twiners Echites Echites and Phillivertella clausa. The 
only monocotyledonous plant from which a determination was 
secured was Bromelia Pinguin. The only herbaceous succulent 
noted was Bryophylium pinnatum. 
The cacti may also occur on the rocky hills, but in the immediate 
vicinity of Port Henderson the flora is almost exclusively of small 
trees and shrubs. 
There are but few species in our series of determinations éeencains 
to the two habitats. These are Achyranthes halimifolia, C aesalpinia 
vesicaria, Capparis ferruginea, Jatropha gossypifolia, a and Prosopts 
julifiora. 
MeEtHops.—The very simple technique used in making the 
determinations has been described in detail elsewhere. Samples 
® Gortner, R. A., and Harris, J. ARTHUR, Notes on the technique of cout 
the depression of the tenting point. Plant World 17:49-53. 1914- 
