Thesis

The vegetative anatomy and floral morphology of chenopodium murale L.

The anatomy and morphology of Chenopodium murale L. was examined by using standard paraffin and clearing techniques. The inflorescence was studied by marking it and making periodic observations of living plants and. also by examining serial paraffin sections and cleared specimens. The anomalous secondary thickening in the stem and root, characteristic of the Chenopodiaceae and related families, is described in detail. Secondary growth in the stem is comparable to that which occurs in C. album L., differing in the process by which secondary phloem is formed. The onset of secondary thickening is correlated with the cessation of stem elongation. Secondary growth in the root of C. murale does not differ significantly from that which has been described for C. album and Beta vulgaris L. The inflorescence, widely regarded as indeterminate and referred to as paniculate, is best described as numerous compound dichasia disposed on a short, determinate axis. The dichasia show an asymmetrical pattern of development, in which one side of each dichotomy elongates more extensively and flowers mature more rapidly than on the opposite side. Two types of flowers are present: perfect and pistillate. Perfect flowers are comparatively rare and tend to occur on the more strongly developed side of the dichasium. Plants are autogamous and abundant seed is produced by plants grown in isolation.

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