— 184 — 
is very open and casts only a light shade. The ends of the 
branches are pendulous, long, thin, pliant and whip-like. 
Two branches are shown in Fig. 10. PALEZzZKIJ) has measured 
roots 19 metres in length. 
The leaves are scattered and pinnate with two linear- 
lanceolate leaflets densely coated with silky hairs. The 
rachis sometimes ends in a slender thorn one centimetre 
long, which frequently persists till the next year. Stipules 
are absent or represented by two small spines. 
The distal part of the year-shoot probably always dies 
away before the next vegetative period, also when it is not an 
inflorescence, which is, however, generally the case (see fig. 
10). The succeeding year-shoot arises from the middle part 
of the first year-shoot. Vigorous year-shoots may be bran- 
ched, but there is no indication that we have here assimilating 
branches lasting only one summer. The plant has likewise 
true leaves. 
The flowers are purple and are arranged in terminal 
racemes. Only the lower flowers in a raceme set fruit; these 
are also the earliest to develope (April): the later flowers are 
dried up by the heat of summer. The fruit-bearing branches 
in fig. 10 show the inflorescence bare above the fruits, and 
it is seen how few fruits there are compared with flowers. 
The fruit is a yellow, one-seeded, indehiscent, winged 
“pod” which ripens in May. When ripe it is spirally twisted 
and this with its lightness enables it to be easily carried off 
by the wind. The seeds are very hard. According to PALEZKIJ 
only 2 per ct. of the fresh seeds germinate 
but they can all be made to do so by cutting 
the skin. The leaves are isolateral in structure. 
The epidermis is thick with-sunk stomata on 
both surfaces. Its coating of unilateral hairs 
is shown in fig. 31. There are about three 
layers of palisade cells on each side and hardly 
any spongy mesophyll. The veins have sheaths 
of hard bast. 
Fig. 31. Ammo- As to the other Ammodendron species, A. 
CR COR OR "Karelini. is closely related to the species just 
lyi. Epidermis å p = ‘ 
withhairs.x 53. described. A. Siewersiit, which can hardly 
