237 



flowered in May or June and the richly branched floral axes 

 remain green and persistent, and as in S. cordifolia (Ross 

 p. 20) they are the assimilating organs for summer. Their 

 structure may be seen in fig. 61 : collateral vascular bundles 

 occur in the pith (comp. SOLEREDER 1899 p. 564); the wood 

 forms a solid cylinder of libriform cells; the cortex consists 

 of green tissue, details of which are given in figures B & C. 



Some Summer - Hemicryptophytes occur in the more 

 favourable localities, in depressions near rivers and similar 

 places. These are only slightly xerophytic and have distinct 

 leaves, generally not very large and often hairy. These plants 

 which I have not investigated very closely include, for in- 

 stance, the following species : Convolvulus pilosellifolius and 

 subhirsutus, Inula caspica, Jurinea derderioides, J. Pollichii, 

 Cousinia tri flora, platylepis and 

 dissecta (spiny), Centaurea ibe- 

 r/ca, Echinm italicum, Lindel- 

 ofia anchusoides and Aster 

 Tripolium. 



D. Geophytes. 



The majority of these are 

 bulbous plants (comp. chap. 

 12, p. 170), and I have only 

 investigated specimens of three 

 important genera Dodartia, 

 Heliotropium and Aristida. 



Dodartia orientalis L. 



This species is a Root- 

 Geophyte which grows in the 

 more favourable localities on 

 clayey soil. Its leafless branch- 

 ed shoots bear purple flowers 



in May or June. The branches, Fig. 62. Dodartia orientalis. A, Part 



as illustrated in fig. 62, have 



f K1 transve ^ secti , on of 



Phloem. Sclerenchvma black. 



P1l > 



a thick epidermis and below Detail of A. A, X 47; B, X 203). 



