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Show 174 HETEROSTYLED TRIMORPHIC PLANTS. CHAP. IV. TABLE 28. Oxalis Regnelli (from Ifildebrand ). Number Number Average Nature of Union. of of Number of Flowers C11psules ~ec· ds per fertilist•d .. Jn·ouuced. Capsule. ------·- ---- Long-styled form, by pollen o.f .longest s~a-} mens of short-styled. Legitimate umon 6 6 10·1 Long-styled form, by polle~ ?f longes~ sta-{! mens of mid-styled. Legitimate umon . 5 5 10·6 ---- Long-styled form, by pollen of own mid-) length stamens. Illegitimate union . ( , 4 0 0 Long-styled form, by pollen of own short-} est stamen. Illegitimate union. • • 1 0 0 I - - -- Mid-styled form, by pollen ofmid-1ength sta-} mens of short-styled. Legitimate union 9 9 10•4 ---- Mid-styled form, by pollen ofmid-length sta-} mens of long-styled. Legitimate union. 10 10 10·1 Mid-sty led form, by pollen of own longest} stamens. Illegitimate unionj • • . 9 0 0 ---- Mid-styled form, by pollen of own shortest) stamens. Illegitimate union • • • f 2 0 0 Mid-sty led form, by pollen of longest sta-} / mens of short-styled. Illegitimate union I 1 0 0 --- Sh01·t-sty led form, by poll en of shortest sta-} I mens of mid-styled. Legitimate union. I 9 9 10•6 Short-sty 1 ed form, by pollen of shortest s ta-} 1 mens of long-styled. Legitimate union. 2 2 9·5 --- Short-sty led form, by pollen of own mid-} i length stamens. Illegitimate union . 12 0 0 Short-styled form, by pollen of own long-) est stamens. Illegitimate union • . J 9 ·O 0 Short-styled form, by pollen of mid-length J stamens of long- styled. Illegitimate 1 0 0 union. • • • • • . • • • • CHAP. IV. OXALIS SPECIOSA. 175 containing on an average 10 · 31 seeds; whilst 39 flowers fertilised illegitimately did not yield a single capsule or seed. Therefore the fertility of the six legitimate to that of the several illegitimate unions, as judged both by the proportion of flowers which yielded capsules and by the average n urn ber of contained seeds, is as 100 to 0. Oxalis speciosa.-This species, which bears pink flowers, was introduced from the Cape of Good Hope. A. sketch . of the reproductive organs of the three forms (Fig. 11) has already been given. The stigma of the long-styled form (with the papillru on its surface included) is twice as large as that of the shortstyled, and that of the mid-styled intermediate in size. The pollen-grains from the stamens in the three forms are in their longer diameters as follows :- From the longest stamens of short-styled. , mid-length , , , longest stamens of mid-styled • , shortest , , , mid-length stamens of long-styled. , l shortest " " Divisions of the Micrometer. . 15 to 16 12 " 13 16 11 to 12 14 12 Therefore the extreme difference in diamet~r is as 16 to 11, or as 100 to 69; but as the measurements were taken at different times, they are probably only approximately accurate. The results of my experiments in fertilising the three forms are given in the following . table. |