The chromosome numbers of 38 Canadian weeds are reported and the significance of some of these numbers is discussed. Counts obtained on material of Iva xanthifolia L., 2n = 36, Erysimum hieraciifolium L., 2n = 48, and Nepeta cataria L., 2n = 34, differ from those obtained by previous workers. The chromosome numbers of the following species have not previously been reported: Rumex transitorius Rech. f., 2n = 20; R. triangulivalvis (Danser) Rech. f., 2n = 20; R. verticillatus L., 2n = 60.
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Gerald A. Mulligan (1959) studied this question.