﻿4 oo BOTANICAL GAZETTE [may 



Occurrence. — Examples of the generalized response were 

 noted in the monocotyledonous families Poaceae, Araceae, Maran- 

 taceae, and Zingiberaceae. At different times the leaves might 

 be rolled in either direction. Whenever the rolling is upward it 

 should be considered as a xerofotic response, when downward, the 

 result of wilting. Examples of the localized response, with which 

 this article deals, were furnished by all the Leguminosae under 



day position; Los Banos, P.I., July 18, 1914. 



but is shown by Ipomoea Pes-capraeoi the Convolvulaceae, and as 

 well in a few other families of plants, particularly those whose 

 species have compound leaves, as in the Meliaceae and Oxalidaceae. 

 While Xerofotic responses were noted also in Abrus precatarius, 

 Acacia farnesiana, Aeschynomene indica, Albizzia procera, Bau- 

 hinia malabirica, Bauhinia sp., Caesalpinia pulcherrima, Cana- 

 valia ensiformis, C. lineata, Clitorea ternata, Delonix regia, Derris 

 elliptica, Desmodium gangeticum, D. laxiflorum, D. pseudotriquetntm, 

 D. triflorum, Enter olobium saman, Erythrina indica, Mezoneurum 

 glabrum, Mucuna nigricans, M. longipedunculata, Pithecolobium 

 duke, P. subacutum, Pterocarpus indicus, Sesbania grandiflora, 

 S. cannabina, Tamarindus indica, Teramnus labialis, Vigna lutea, 



