Abstract
Levels of variation revealed by starch gel electrophoresis and morphologic character analysis were compared within and among four diploid species of Chenopodium: C. fremontii (sect. Chenopodium subsect. Leiosperma), C. neomexicanum, C. palmeri, and C. watsonii (sect. Chenopodium subsect. Cellulata). The data sets exhibited little concordance. Numerical analysis of morphologic characters demonstrated that C. neomexicanum and C. palmeri are relatively distinct, whereas allozyme analysis indicated a high degree of genetic similarity among populations of the two species. I concluded that C. palmeri should be reduced to a variety of C. neomexicanum. Chenopodium watsonii expressed the highest degree of allozyme heterozygosity and polymorphism and may represent the oldest extant member of subsection Cellulata. Although C. fremontii is classified in another subsection, it exhibited higher genetic identity values with C. neomexicanum and C. palmeri than did C. watsonii. In addition, morphologic and allozymic similarity between C. fremontii and C. neomexicanum suggests the need for further examination and possibly realignment of subsections Cellulata and Leiosperma.
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