The structure of the leaf is dorsiventral (fig. 51), but the 
stomata and salt-secreting glands are found on both surfaces, 
whereas the setaceous hairs are absent on the upper side. 
There are long palisade cells on the upper side, generally 
transversely divided, and short palisades on the lower side 
Fig. 51. Frankenia hirsuta. A, Outline of leaf in trans- 
verse section with epidermis, palisade cells and hairs 
indicated. B, Part of leaf in transverse section. Xyl., 
Xylem; Phl., Phloëm. C: Gland. A: X 47; B, C: X 203. 
and a loose spongy parenchyma with crystal-cells in the 
middle. The air-spaces in the interior of the leaf are gener- 
ally fairly large. Sclerenchyma is wanting. 
Convolvulus eremophilus Bois. & Buhse. 
An undershrub growing on clay or stationary sand. The 
year-shoots arising from the perennial branches are branched 
