1987. The taxonomy of the Viola nuttallii complex. Can. J. Bot. 65: 2562 -2580.Morphological, cytological, and phytochemical data were incorporated into numerical and statistical analyses to produce a revision of Viola subsection Nuttallianae. A basic chromosome number of x = 6 was confirmed for this polyploid~complex, which includes five species: V. vallicola, 2n = 12; V. tomentosa, 2n = 12; V. nuttallii, 2n = 24; V. praemorsa, 2n = 36 and 48; and V. bakeri, 2n = 48. Departures from recent authors include the recognition of two varieties in V. vallicola, vallicola and major (Hook.) Fabijan, based on flavonoid chemist~y and distribution. Violapraemorsa is envisaged as embracing a wide range of morphological and chemical diversity, the extremes of which are recognized as the subspecies praemorsa, flavovirens (Pollard) Fabijan, and linguaefolia. In the absence of significant morphological or distributional differences between the V. liinguaefolia and V. praemorsa subspecies major (sensu Baker and Clausen) and oregona, these three previously recognized taxa are included in subspecies linguaefolia. Based on cytological, morphological, and flavonoid data presented here, possible phylogenetic relationships are discussed. FABIJAN, D. M., PACKER, J. G . , et DENFORD, K. E. 1987. The taxonomy of the Viola nuttallii complex. Can. J. Bot. 65 : 2562-2580.Des donnCes morphologiques, cytologiques et phytochimiques ont Ct C incorporCes i des analyses numCriques et statistiques pour obtenir une revision du genre Viola sous-section Nuttallianae. Un nombre chromosomique de base de x = 6 a Ct C confirm6 pour ce complexe polyploi'de qui comprend cinq espkces : V. vallicola, 2n = 12; V. tomentosa, 2n = 12; V. nuttallii, 2n = 24; V. praemorsa, 2n = 36 et 48; et V. bakeri, 2n = 48. Les Ccarts par rapport i certains auteurs recents comprenaient L a reconnaissance de deux variCtCs du V. vallicola, vallicola et major (Hook.) Fabijan, fondCe sur la chimie et les patrons de distribution des flavonoi'des. Le Viola praemorsa est envisagC comme incluant des diversitCs morphologiques et chimiques importantes dont les extremes sont reconnus comme les sous-espkcespraemorsa, flavovirens (Pollard) Fabijan et linguaefolia. En l'absence de diffkrences morphologiques ou distributionnelles significatives entre le V. linguaefolia et le V. praemorsa sous-espkce major (sensu Baker et Clausen) et oregona, ces trois taxons, reconnus jadis comme Ctant distincts, sont inclus dans la sous-espkce linguaefolia. Les liens phylogCniques basks sur les donnCes cytologiques, morphologiques et flavonoi'des prCsentCes ici sont discutCs. [Traduit par la revue]