. Studies on the vegetation of the Transcaspian lowlands. Botany. — 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 a
. Studies on the vegetation of the Transcaspian lowlands. Botany. — 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. PolUchii, Cousinia triflora, platylepis and dissecta (spiny), Centaurea ibe- rica, Echium italicum, Lindel- ofia anchusoides and Aster TripoUum. D. Geophytes. The majority of these are bulbous plants (comp. cliap. 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 "J, transverse seetion of stem; Phi, Phloem. Sclereiicnyma black. B, a thick epidermis and below Detail of A. A, X iT; B, X 203).. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Paulsen, Ove, 1874-1947; Second Danish Pamir expedition. Copenhagen, Gyldendalske Boghandel
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbotany, bookyear1912
