. Handbook of flower pollination : based upon Hermann MuÌller's work 'The fertilisation of flowers by insects' . Fertilization of plants. HETEROSTYLY 47 Among dimorphous flowers four modes of fertilization are possible, two of them legitimate, and two illegitimate. Darwin has represented the possible legitimate and illegitimate unions by the accompanying diagram (Fig. 5). Eighteen modes of fertilization are possible among trimorphous flowers, and of these six are legitimate. If we indicate the longest organs { S and j) by /, the medium ones by m, and the shortest by s, and use a, b, and c to r
. Handbook of flower pollination : based upon Hermann MuÌller's work 'The fertilisation of flowers by insects' . Fertilization of plants. HETEROSTYLY 47 Among dimorphous flowers four modes of fertilization are possible, two of them legitimate, and two illegitimate. Darwin has represented the possible legitimate and illegitimate unions by the accompanying diagram (Fig. 5). Eighteen modes of fertilization are possible among trimorphous flowers, and of these six are legitimate. If we indicate the longest organs { S and j) by /, the medium ones by m, and the shortest by s, and use a, b, and c to represent the long-styled, medium-styled, and short-styled forms respectively, the six legitimate crossings possible are as follows :â / S {b) with / 5 . li (c) â / s. m $ (a) with m 5 m i (f) â m 5 The twelve illegitimate modes of crossing are / S {b) with m 2 â m t (a) with / 5 I i (b) â s 2 ⢠"' S {<^) ., â¢? $ / S {c) ,, w §. mi (f) â / 5 The six legitimate modes of crossing have been schematically represented by Darwin in the following manner:â J 5 (a) with s 2 . s i (b) â s 2- s 5 (a) with / 5 . s i {a) â m 2- si {b) â I 2- s i {6) â m 2-. Fig. 6. Diagram showing the possible legitimate unions in a trimorphic plant {Lythrum Salicaria) (after Darwin). The arrows and dotted lines indicate the anthers from which the pollen must be brought to the stigma of one of the three forms, so as to give a legitimate union with complete fertihty(Loew). (i) Long-styled form. (2) Medium-styled form. (^^) Short-styled form. The results of numerous experiments carried out with the greatest care by Darwin and Hildebrand are as follows (according to Loew, 'Einfuhrung in die Blutenbiologie,' pp. 218-20):â. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Knuth, Paul, 1854-1899; Knuth, Paul, 1854-1
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