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Different bumble bees visiting digitalis purpurea and digitalis purpurea heptandra

, : Different bumble bees visiting digitalis purpurea and digitalis purpurea heptandra. Mededelingen Landbouwhogeschool Wageningen 75(20): 1-6

In a mixed field containing Digitalis purpurea L. f. heptandra De Chamisso among a majority of the typical D. purpurea, the D. purpurea flowers are regularly visited by large bumble bees of the types Bombus hortorum and B. terrestris, whereas the smaller B. agrorum shows a strong binding to the D. purpurea f. heptandra plants in their flying from one D. purpurea f. heptandra plant to another, disregarding the D. purpurea's. Features of this binding are discussed and some additional observations regarding the relation between seed formation and vegetative propagation are mentioned. Notwithstanding the fact that a number of reports on D. purpurea f. hepatandra exist in earlier and more recent literature, not many botanists appear to have ever seen this deviation.

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Related references

Wassink, E.C., 1975: Different bumble bees visiting Digitalis purpurea and its forma heptandra. D. purpurea heptandra does not have a long, tubular corolla like that of D. purpurea, and so the stamens are not pressed together inside the flower. In a field of mixed plants, D. purpurea was visited regularly by large bumble bees, Bombus hortoru...

Vaiciuniene, J., 1974: Comparative investigation of the biology of Digitalis lanata, Digitalis ambigua, Digitalis purpurea and Digitalis purpurea grafted population. Darb C Ser Biol Mokslaij Liet TSR Mokslu Akad: 49-55

Vaichyunene Y.A., 1975: Comparative study of the biology of digitalis lanata digitalis ambigua digitalis purpurea and a digitalis purpurea inoculated population. Lietuvos TSR Mokslu Akademijos Darbai Serija C Biologijos Mokslai (1): 49-55

Liedtke, S.; Wichtl, M., 1997: Digitanol glycosides from Digitalis lanata Erh and Digitalis purpurea L, part 2 Glucodiginin and glucodigifolein from Digitalis purpurea L. Pharmazie 52(1): 79-80

Wassink E.C., 1972: Some recent observations on digitalis purpurea f heptandra. Mededelingen Landbouwhogeschool Wageningen 72(22): 1-18

Van Den Noort M.E.; Wassink E.C., 1980: Different forms of flowers in the same spike in digitalis purpurea f heptandra. An attempt has been made to quantitatively grasp differences in the degree of heptandra in various flowers along the same spike on the same day and in a certain sequence of days. Smooth segregations between the stages (see text) of successive flow...

Wassink, E.C., 1972: Some recent observations on Digitalis purpurea L. f. heptandra De Chamisso. A deviant, naturally occurring, form of the foxglove, in which the flowers were reduced to narrow petalloid structures with 7 protruding stamens, was maintained in free pollination over several years. The morphological and genetical significance o...

Lugt, Cb, 1976: Variability in the occurrence of formylated digitalose glycosides in Digitalis purpurea L. III. The cardiac-glycoside composition of different Digitalis purpurea L. populations. Pharmaceutisch weekblad: 111 (19) 441-455

Hinz, Pa, 1988: Biosystematical studies of the Digitalis purpurea L. aggregate (Scrophulariaceae) in the western Mediterranean area. Typification of Digitalis purpurea L. var. toletana Font Quer. Candollea 3(2): 641-643

Hinz P A., 1988: Biosystematical studies of the digitalis purpurea aggregate scrophulariaceae in the western mediterranean area typification of digitalis purpurea var toletana font quer. Digitalis purpurea L. var. toletana Font Quer is typified. A lectotype has been designed.