— 191 — 



leaflets are silvery haired and motile since by curvature of 

 the petiole they can assume a vertical position. 



On the year- old shoot (see fig. 36) short-shoots arise in 

 the leaf-axils, they bear flowers two together on a slend€r, 

 furcate stalk. These open in April or May, and by the end 

 of May ripe fruits occur. The fruit is a hard, few-seeded, 

 inflated pod, 1 — 2 centimetres long, placed on a short gyno- 

 phore (fig. 36). Owing to its lightness, hardness and round- 

 ness the fruit may roll a long time before the wind without 

 being injui-ed. 



The anatomy of the leaves has been described by J. 

 Weyland and B. Jonsson. I have found the same structure 

 as these authors, but like Weyland I have not seen the 

 hypoderm on the underside of the leaf which Jonsson figures. 

 The leaf is isolateral, with about three layers of palisade 

 cells containing starch on each side, a translucent tissue of 

 rounded cells, and strong sclerenchyma bands along the veins. 

 On each side the stomata are slightly sunk. The leaf, like the 

 bark, contains numerous tannin cells lying almost exclus- 

 ively amongst the palisade cells, but different in shape. 



Ewersmannia subspinosa (Fisch.) Fedtsch. 

 A low shrub occurring at least in the northern part of 

 the territory dealt with here, but which I have not seen 

 growing. The bark of the branches is fibrous. The leaves are 

 two-rowed, pinnate with 9 — 11 leaflets half a centimetre long; 

 they have small membranous stipules each of them subtending 

 two thorn-branches one of which is generally longer than 

 the other. The flowers arise from the longer thorn-branch 

 which attains a length of 3 — 4 centimetres, they appear in 

 May. The fruit is a few-seeded, flat pod with one or more 

 S curves; it is carried swiftly by the wind. 



Prosopis Stephaniana Spr. 

 A small strongly branched shrub which attains the height 

 of about half a metre. It seems to thrive best on sandy 

 clay. 



