Geographical variation in fruit morphology in Swedish Callitriche hermaphroditica (Callitrichaceae)

• Published in: Nordic Journal of Botany
• Main Author: Martinsson, Karin
• Format: Article in Journal/Newspaper
• Language: English
• Published: Wiley 1991
• Subjects: Plant Science; Ecology, Evolution, Behavior and Systematics; Norway; karelia*
• Online Access: http://dx.doi.org/10.1111/j.1756-1051.1991.tb01257.x; https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1756-1051.1991.tb01257.x; https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1756-1051.1991.tb01257.x

The differentiation of Callitriche hermaphroditica in Sweden expressed in fruit morphology has been studied. Variation among 50 wild‐scored populations is illustrated by canonical variates analysis and cluster analysis and shown to be geographically correlated. Two major geographical races differing in fruit size are distinguished and confirmed by the study of herbarium collections. The anatomy of the fruits is described, based on light microscopical studies. An anatomically aberrant fruit form was found in two different areas in Sweden. Comparisons are made with herbarium collections from Denmark, Norway, Finland and Soviet Karelia. The biogeography, in the light of postglacial events, and the taxonomy of C. hermaphroditica are discussed and a distribution map of C. hermaphroditica s. lat. in Sweden is presented.