The mutation theory; experiments and observations on the origin of species in the vegetable kingdom . Fig. 10. Madia clcgans. Fig. II. A, B, Chclidonium ma juslatipctalum. C, D, CJiclido)iiumniajus. crown instead of an open cross. I found it to be con-stant through several generations. The constancy of the fasciated variety of Myosofisalpestris; Victoria with its broad, many-petalled centralflowers, is likewise well known, as is also that of Linaria Examples of Constant Races. 87 vulgaris tvicalcarca,^ of many glabrous forms like Lych-nis zcspcrtina glabra, of thornless types like Datura Stra-
The mutation theory; experiments and observations on the origin of species in the vegetable kingdom . Fig. 10. Madia clcgans. Fig. II. A, B, Chclidonium ma juslatipctalum. C, D, CJiclido)iiumniajus. crown instead of an open cross. I found it to be con-stant through several generations. The constancy of the fasciated variety of Myosofisalpestris; Victoria with its broad, many-petalled centralflowers, is likewise well known, as is also that of Linaria Examples of Constant Races. 87 vulgaris tvicalcarca,^ of many glabrous forms like Lych-nis zcspcrtina glabra, of thornless types like Datura Stra-monium incrmis- etc., all of which I have tested per-sonally. Space docs not permit of the compilation hereof anything like a complete list of constant Fig. 12. Mclilotus coenilea monophyUa. Eacli leaf consistsof a single blade but is more or less deeply incised. Oneof the lateral leaflets in the middle leaf on the right ofthe figure appears to be quite free. A, a bract from theinflorescence; here the leaves are least incised. ^ J. H. Wakker, Linaria vulgaris, Nederl. Kruidk. Archief, 1889,with plate X. See Fig. 5 on page 31 of Vol. I. 88 Siiddoi Appearance and Constancy. I shall conclude by referring to a race of MeliJotuscoerulea, the possession of which I owe to the kindnessof Prof. ]\I. W. Beyerinck (p. 63). Its leaflets^ arefused to a single blade in which the three main nervesstill diverge from the base. The blade moreover hasthree distinct tips, the depth of the indentations betweenthese being subject to considerable fluctuating rarely the three parts are only united from the baseto halfway up or less, and sometimes they are separatedalmost to the base and in rare cases even entirely these forms may occu
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