= OM ce 
with salt-concretions; especially is this the case with T. 
hispida and T. Karelini, where these are very numerous. 
As regards the development of vegetative and floral 
branches, the species of Tamaria may be divided into two 
groups. In the first group the floral shoots appear on the 
year-shoot of last year while the present year-shoot is purely 
vegetative. This group includes Tamarix laæa, Meyeri, Andros- 
sowii, florida, elongata, polystachya. This characteristic is 
shown in T. laxa (fig. 47). The vegetative and floral shoots 
are, however, not always separated as in this case, but may be 
intermingled. A single one or several of the vegetative shoots 
seen in fig. 47 will become rejuvenescence shoots, the remain- 
der are short-lived assimilating shoots. Ali the vegetative 
shoots, as will be noticed, are many times branched. The 
species of this group flower early, during April and May, 
and according to BuNGE (1852 p. 8) they have as a rule 
tetramerous flowers. 
The species of the second group bear the flowers at 
the apex of the present year-shoot which has vegetative 
branches at its base. To this group belong T. Pallasii, hispida, 
Karelini, arceuthoides, Ewersmannü, karakalensis, Korolkowii, 
leptostachya and pycnocarpa. 
The branch of T. hispida illustrated in fig. 48 is the 
shoot of this year. All the lower branches of primary order 
bear much-branched vegetative shoots at the base and inflor- 
escences at the top, or they are purely vegetative. The 
upper year-shoot branches are entirely floral. 
The species included here are said by Bunce (I. c.) to 
have as a rule pentamerous flowers which open late, from 
July to September. As the flowers arise on the outmost 
part of the year-shoot and its branches, they cannot appear 
until these axes have attained a certain stage of development. 
In this group as in the first, the flower axes and the 
greater part of the vegetative branches fall off, and only a 
single one or a few become rejuvenating shoots. 
Short-lived vegetative branches may appear in all the 
species on old year-shoots in the axils of leaves which have 
fallen off. They may bear inflorescences as in the species 
of the second group. 
14* 
