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Show 170 BARTONIA AUREA. TABLE LXII. Clarkia elegans. No. of Pot. Crossed Plants. Self- fertilised Plants. - - 1- Inches. Inches. I. 40~ 33 35 24 25 23 II. 33~ 30~ Total in inches. 134•0 110•5 The average height of the four crossed. plants is 33 · 5, and that of the four self-fertilised plants 27 · 62 mches, or as 100 to 82 The crossed plants altogether produced 105 and the selffe; t,ilised plant~ 63 capsules; OT as 100 to 60. In both pots a self-fertilised plant flowered befoTe any one of the cTossed plants. XVI. LOASAOEJE.-BARTONIA AUREA. Some flowers were crossed and self-fertilised in the usual manner during two seasons; but as I reared on the first occasion No. of Pot. I. II. III. . IV. v. VI. ---- Total in inches. TABLE LXIII. Burlonia aurea. Crossed Plants. - - Iuches. 31 Self-fertilised Plants. Inch es. 37 - - 18~ 1- 2 0 ~ 19~ 40 ~ --- 25 35 . 36 15~ --- 31 18 16 11 ~ -- ~- -- 20 3 2~ - -~ 197•0 210·5 CHAP. v. P ASSIFLORA GRACILIS. 171 only two pairs, the results are given together. On both occasions the crossed capsules contained slightly more seeds than the selffertilised. During the first year, when the plants were about 7 inches in height, the self-fertilised were the tallest, and in the second year the crossed were the tallest. When the two lots were in full flower they were measured, as in the preceding table. The average height of the eight crossed plants is 24 · 62, and that .of the eight self-fertilised ~6·31 inches; or as 100 to 107. So that the self-fertilised had a decided advantage over the crossed. But the plants from some cause never grew well, and finally became so unhealthy that only three crossed and three self-fertilised plants survived to set any capsules, and these were few in number. The two lots seemed to be about equally unproductive. XVII. p ASSIFLORAOEJE.-p ASSIFLORA GRACILIS. This annual species produces spontaneously numerous fruits when insects are excluded, and behaves in this respect very differently from most of the other species in the genus, which are extremely sterile unless fertilised with pollen from a distinct plant.* Fourteen fruits from crossed flowers contained on an average 24·14 seeds. Fourteen fruits (two poor ones being rejected), spontaneously self-fertilised under a net, contained on an average 20 ·58 seeds per fruit; or as 100 to 85. · These seeds were sown on the opposite sides of three pots, but only two pairs came up at the same time; and therefore a fair judgment cannot be formed. TABLE LXIV. Passijloru gracz'lis. No. of Pot. Crossed Plants. Self-fertilised Plants. Inches. Inches. I. 56 38 II. 42 64 Total in inches. 98 102 The mean of the two crossed is 49 inches, and that of the two self-fertilised 51 inches ; or as 100 to 104. * 'Variation of Animals and chap. xvii. 2nd edit. vol. ii. p. Plants under Domestication,' 118. |