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Show 172 HETEROSTYLED TRIMORPHIC PLANTS. CHAP. IV. TABLE 27-continued. Oxalis Valdiviana (from Hildebrand). Number I Number Number Nature of Union. of of of Flowers 1 Capsules Seeds per fertilised. J produced. Cap~ule . -------- Mid-styled form, by pollen of mid-length sta-} mens of long-styled. Legitimate union. 38 I 38 11·3 Mid-styled form, by pollen of mid-length) stamens of short- styled. Legitimate union. • . • . • . . . . 23 23 10•4 ---- Mid-styled form, by pollen of own and) ow.n-form longest stamens. Illegitimate 52 0 0 UniOn . , . , , , , • . . ow?-form shortest stamens. Illegitimate Mid-styled form, by pollen of own and) UnlOll. , • • • • , • • . 30 1 6 Mid-styled form, by pollen stamens of shortest) of long-styled. ~lle~iti~1at~ 16 0 0 union. Mid-styled form, by pollen of longest sta-} mens of short-styled. Illegitimate union 16 2 2·5 - --- - - --"' - Short-styled form, by pollen of shortest sta-} mens of long-styled. Legitimate union. 18 18 11•0 ·Short-styled.form, by pollen of shortest sta-} 10 I 10 I mens ofmtd-styled. Legitimate union • 11• 3 Short-styled form, by pollen of own and) ow.n-form longest stamens. IlJegitimate 21 0 0 un1on . • . . . • • . • . ___. Short-.ty led form, by pollen of own and) own-for~ mid-length stamens. Illegiti- 22 0 0 mate un1on • • • . • . . . - - - - -- Short-styled form, by pollen of longest sta-} _ ~~s of mid-styled. Illegitimate union 4 0 0 Short-styled form, by pollen of mid-length} ---- sta.mens of long- styled. Illegitimate 3 0 0 Union. . . , . • • • • • - CHAP. IV. OXALIS REGNELLI. 173 We here have the remarkable result that every one of 138 legitimately fertilised flowers on the three forms yielded capsules, containing on an average II· 33 seed.s. Whilst of the 255 illegitimately fertilised flowers, onlv 6 yielded capsules, which contained 3 · 83 seeds on a~ average. Therefore the fertility of the six legiti1nate to that of the twelve illegitimate unions, as judged by the proportion of flowers that yielded capsules, is as 100 to 2, and as judged by the average number of seeds per capsule as 100 to 34. It may be added that some plants which were protected by nets did not spontaneously produce any fruit; nor did one which was left uncovered by itself and was visited by bees. On the other hand, scarcely a single flower on some uncovered plants of the three forms growing near togetl?-er failed to produce fruit. Omalis Regnelli.-This species bears white flowers and i~habits Southern Brazil. Hildebrand says that the stigma of the long-styled form is somewhat larger than that of the mid-styled, and this than that of the short-styled. The pistil of the latter is clothed with a few hairs, whilst it is very hairy in the other two forms. The diall,leter of the pollen -grains from both sets of the longest stamens equals 9 divisions of the micrometer,-that from the mid-length stamens of the long-sty led form between 8 and 9, and of the shortsty led 8,-and that from the shortest stamens of both sets 7. So that the extreme difference in diameter is as 9 to 7 or as 100 to 78. The experiments made by Hildebrand, which are not so numerous as in the last case, are given in Table 28 in the same manner as before. The results are nearly the same as in the last case, but more striking ; for 41 flowers belonging to the three forms fertilised legitimately all yield~d capsules, |