86 HARSHBERGER— LEAF STRUCTURE OF [April 23. 



leaf surface (turned upside down in Fig. 25) consists of thick- 

 walled epidermal cells beneath which are two rows of illy defined, 

 palisade cells, while beneath the palisade are compactly-placed, 

 rounded chlorenchyma cells extending to the loose parenchyma 

 cells with large intercellular spaces. The lower convex, epidermal 

 surface is composed of thick-walled cells, the outer wall being espe- 

 cially thick. The guard cells are depressed the thickness of the 

 outer cell wall (Fig. 25a). 



Limonium carolinianuui (Plate V, Figs. 26 and 26a). — The sea 

 lavender has thick, stalked, radical leaves from which the much- 

 branched scape arises, bearing small, lavender-colored flowers. The 

 epidermal cells are large, thin-walled, but the outer wall is slightly 

 thicker than the other walls. Two rows of palisade cells are found 

 and a spongy parenchyma of rounded cells. The stomata are at the 

 surface (Fig. 26a). 



Sucuda linearis (Plate V, Fig. 27). — The sea blite is an erect, 

 or ascending, fleshy, saline plant 2-9 dm. high. Its leaves are nar- 

 rowly linear and acute. The epidermal cells are thin-walled, but 

 project as rounded knobs the tops of which are thickened. The 

 chlorenchyma, as palisade tissue, is found equally developed on the 

 upper and the lower surfaces, while the interior cells are large and 

 rounded parenchyma elements. A typic diplophyll. 



Gerardia maritima (Plate V, Figs. 28 and 28a). — This marsh 

 plant is a slender, erect, branching annual, somewhat fleshy with 

 linear, obtuse leaves. The upper leaf epidermis has two kinds of 

 hairs, straight, projecting ones and low, dome-shaped hairs, the 

 terminal cells containing a brown substance. The palisade chloren- 

 chyma forms two well-defined rows with compact spongy paren- 

 chyma beneath. The lower epidermis consists of thin-walled cells 

 with superficial guard cells (Fig. 28a). 



Chenopodium rubrum (Plate V, Figs. 29 and 290). — The coast 

 blite has a much-branched, angled stem with thickish, triangular, 

 lanceolate leaves tapering below into a wedge-shaped base and above 

 into an acute point, sparingly and coarsely toothed. The epidermal 

 cells are thin-walled, with the outer wall curved outward. The 

 vascular bundles are centrally placed, while the elongated, rounded 



