Verbatim text: Ugborogho, R. E. 1977. North American Cerastium arvense Linnaeus: Taxonomy, reproductive system and evolution. Phyton (Horn) 35: 169–187
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taxonomies. Ugborogho, R. E. 1974. North American Cerastium arvense Linnaeus. IV. Phenotypic variation. Phyton (Horn) 32: 89–97. Ugborogho, R. E. 1977. North
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those species have been synthesized. Many workers, most recently R. E. Ugborogho (1977), have included C. velutinum and C. viride in C. arvense as varieties
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U Ugborogho1974a U cont. Ugborogho1977a
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