— 255 — 
have long triangular and hairy leaves, the upper ones sub- 
tending the solitary flowers. 
H. villosa and macranthera, probably also H. pilosa, have 
leaves constructed after the ordinary centric type. Since the 
leaf is thick the aqueous tissue in the middle is large; the 
midrib has a bast-sheath; the hairs consist of a basal cell 
and a long filamentous cell; the stomata are not sunk. 
The leaves of H. Karelini (fig. 78), a bracteole-succulent, 
are similar in structure; they have very 
short hairs and the stomata are slightly 
sunk. 
Closely related to the long-leaved 
species of Halimocnemis both in ap- 
pearance and inner structure we have 
Halanthium gamocarpum, and probably 
also Piptoptera turkestana, the anatomy 
of which I have not examined. 
Fig. 78. Branch of Hali- 
mocnemis Karelini. July. 
Suaeda. (Nat. size). 
The leaves of a number of species 
of this genus have been examined. As regards leaf-structure 
these may be divided into three groups. 
The leaf-structure of the species of the first group is 
similar to that already described for S. maritima (see for 
instance WARMING 1897, p. 207, 1890, p. 221). Below the 
thin-walled epidermis there is a green mesophyll of palisade- 
like cells which become larger and contain less chlorophyll 
towards the interior; the veins lie in a curve in the middle 
of the leaf. Other species belonging to this group are: S. 
setigera and S. Olufsenii (from Pamir), also S. linifolia which 
differs in having flat leaves with ordinary isolateral green- 
tissue. 
The second group of Suaeda has underneath the epid- 
ermis a single layer of palisade cells all round and a starch- 
sheath below this (fig. 79, B). Thus far these leaves follow 
the ordinary centric type of the Chenopodiaceae. But those 
veins, which in other organs of this type run _ obliquely 
through the central aqueous tissue and arrange themselves 
