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Nach Gärtner gehören hieher die ausgezeichnet fruchtbaren Hybriden: Aquilegia atropurpurea-canadensis, Lavatera pseudolbia-thuringiaca, Geum urbano-rivale und einige Dianthus-Hybriden; nach Wichura die Hybriden der Weidenarten.
According to Gärtner, these include the excellently fertile hybrids of: Aquilegia atropurpurea-canadensis, Lavatera pseudolbia-thuringiaca, Geum urbano-rivale and certain Dianthus-Hybrids; according to Wichura, the hybrids of willow species.

In the manuscript, the taxonomic names are in roman rather than cursive script as the rest of the text, indicating their technical nature, but this was not reproduced in the print version.

Gärtner See Carl Friedrich Gärtner, Versuche und Beobachtungen über die Bastarderzeugung im Pflanzenreich (Stuttgart: Hering, 1849), pp. 421–422, where he lists “extraordinarily fertile hybrids” (ausgezeichnet fruchtbare Bastarde) that “propagate themselves with unchanged type like pure species” (pflanzen sich gleich den reinen Arten von selbst mit unverändertem Typus fort). Aquilegia atropurpurea-canadensis and Geum urbano-rivale also appear in a list of hybrids that are “fertile to quite some degree” (in ziemlichen Grade fruchtbar; op. cit., p. 388). In addition, Geum urbano-rivale is mentioned as an example for “mixed” (vermischte) hybrids, that are perfectly intermediate between the two parental types (op. cit., p. 281). All of these are “species hybrids” and Gärtner names them by combining the specific epithet of each species by a dash, with the “maternal factor” placed first (op. cit., p. 602). He concludes his own listing of “extraordinarily fertile hybrids” with the statement, though, that they show “slowly diminishing fertility and general degeneration of the species” (allmählig abnehmende Fruchtbarkeit und allgemeines Decrepidiren der Art). On Gärtner, see p. 3, s. 4.

Aquilegia atropurpurea-canadensis Aquilegia is a genus of plants referred to as columbine in vernacular English. A. atropurpurea is considered a variety, and hence a synonym, of A. viridiflora today, whereas A. canadensis remains an accepted species.

Lavatera pseudolbia-thuringiaca Known as tree mallow. The taxonomic status of L. pseudolbia is unresolved, L. thuringiaca is the accepted name for the garden tree-mallow.

Geum urbano-rivale Avens; G. urbanum is the wood aven, G. rivale the water aven, and both names are accepted today.

Dianthus hybrids On the genus Dianthus, see p. 37, s. 10. Gärtner cites D. Armeria-deltoides, caesio-arenarius, superbo-arenarius superbo-caryophyllus, superbo-pulchellus, chinensi-barbatus (op. cit., 422). On D. Armeria-deltoides, see p. 40, s. 10.

Wichura See p. 3, s. 4. Wichura did actually not claim that the willow hybrids he observed were constant. This was rather a claim that Kerner von Marilaun made in a paper, published in 1860, in which he reported Wichura's results; see Robert C. Olby, "Mendels Vorläufer: Kölreuter, Wichura und Gärtner", Folia Mendeliana 21 (1986), pp. 49–67.

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