128 PLANT HABITS AND HABITATS IN THE 



down of cell-walls. But according to Solereder, inasmuch as the 

 secretion reservoirs are surrounded by an epithelium several cells in 

 thickness, the innermost walls of which ultimately become dissolved, 

 freeing the resinous substance, the gland is to be considered as being 

 schizolysigenous. Pocket glands of this character were found in all 

 of the species of Eremophila examined except E. longifoUa, thus sup- 

 porting the results of von Bokorny (Solereder, 1899:706). Glands 

 of this kind were not seen in the stems of E. oppositifolia in the material 

 available for examination by me, but they should be expected to occur 

 in them as long as they have been surely found in the leaves. 



The glandular trichomes exhibit some variation as between different 

 species. They may be either short, as they usually are, or have a 

 stalk of several cells. The heads may either be flattened or somewhat 

 elongated. The glandular hairs of E. neglecta and of E. freelingii are 

 of the former, and those of E. rotundifolia are of the latter type. 

 Glandular hairs were found in all of the species examined except 

 E. longifoUa, E. oppositifolia, and Pholidia scoparia. So far as the 

 resinous secretion of the hairs is concerned, it was seen to be more or 

 less abundant on the leaves and stems wherever the hairs were to be 

 found, but only in E . freelingii was it found to be copious. In specimens 

 of this species from Oodnadatta, and especially on the stems, the 

 resinous exudation was so abundant as to quite cover the glandular 

 hairs themselves. It was also present in large amount on the leaves. 



Stomata were found on both sides of the leaves of all of the species 

 examined. In most cases they were flush with the leaf-surface. How- 

 ever, in the leaves of such as had a heavy covering of hairs, as for 

 example in E. rotundfolia, the guard-cells projected somewhat. It 

 was noticeable, also, that a similar condition obtained in E. freelingii, 

 where the resinous coating of the leaf was heavy. In either instance 

 it is apparent that this superior position of the stomata is directly 

 related to the heavy protective cover of the leaf. 



A heavy cuticle was found to be present on the leaves of most species, 

 but it is heavier in some than in others, and this feature is usually 

 con elated with the presence, or absence, of a resinous covering or 

 one of trichomes. Where such is largely or wholly absent, as in 

 E. brownii, alternifolia, and paisleyi, the cuticle is especially heavy. 

 In the case of the last two species the cuticle is so heavy that it brings 

 about a rigid condition of the leaf itself. In the case of E. rotundifolia, 

 however, where the hairy leaf-coveiing is particularly heavy, as will 

 be mentioned below, the cuticle is very light. 



The structure of the leaves is generally, although apparently not 

 exclusively, dorsiventral. Thus, palisade cells are usually to be found 

 on the dorsal and not on the ventral side. In Pholidia scoparia, 

 Eremophila latrobei, E. longifoUa, E. paisleyi, E. alternifolia, and E. 

 oppositifolia, however, either palisade cells similar in appearance 



