CHROMOSOME NUMBERS OF CANADIAN WEEDS. III

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Abstract
The chromosome numbers determined from material of 55 Canadian weeds collected in the wild are reported. The chromosome numbers for 45 of the 55 weeds studied were previously obtained by other workers, mostly on non-Canadian material. The chromosome numbers of the following 10 taxa are reported for the first time: Chenopodium berlandieri Moq. var. zschackei (Murr.) Murr. 2n = 36; Chenopodium botrys L. 2n = 18; Corispermum villosum Rydb. 2n = 18; Iva axillaris Pursh 2n = 36 and 54; Lactuca pulchella (Pursh) DC. 2n = 18; Descurainia pinnata (Walt.) Britt. ssp. brachycarpa (Richards.) Detling 2n = 28; Descurainia richardsonii (Sweet) O. E. Schulz ssp. richardsonii 2n = 14; Descurainia sophioides (Fisch.) O. E. Schulz 2n = 14; Dracocephalum thymiflorum L. 2n = 20; Sium suave Walt. 2n = 22.