On British Wild Flowers Considered in Relation to Insects
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The same is the case with the other two forms, so that eighteen modes of union are possible, of which six are natural or "legitimate," twelve are illegitimate, and more or less sterile. This case is therefore indeed most complex.
Mr. Darwin suggests {Jour. Linn. Soc. v. viii.
1864, p. 193) that the trimorphous condition of this plant may be advantageous, because if it were dimor- phous only there would be but an equal chance in favour of any two plants being of different forms, and therefore ca...pable of self-fertilisation ; whereas, being trimorphous, the chances are two to one. In the cowslip and primrose, wher^ large numbers of plants grow together, this, he thinks, would not be so material.
The genus Lythrum is also remarkable for the great differences existing between different species.
For instance, L, grcefferi, like L, salicaria, is tri- morphous ; while L. thymifolia is dimorphous, and Z. hyssophifolia is homomorphouS.
CUCURBITACE.E.
Of this order we have only a single species, the common Bryony {Bryonia dioica).
What to read after On British Wild Flowers Considered in Relation to Insects?
You can find similar books in the "Read Also" column, or choose other free books by Lubbock, John, Sir, 1834-1913 to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
The same is the case with the other two forms, so that eighteen modes of union are possible, of which six are natural or "legitimate," twelve are illegitimate, and more or less sterile. This case is therefore indeed most complex.
Mr. Darwin suggests {Jour. Linn. Soc. v. viii.
1864, p. 193) that the trimorphous condition of this plant may be advantageous, because if it were dimor- phous only there would be but an equal chance in favour of any two plants being of different forms, and therefore ca...pable of self-fertilisation ; whereas, being trimorphous, the chances are two to one. In the cowslip and primrose, wher^ large numbers of plants grow together, this, he thinks, would not be so material.
The genus Lythrum is also remarkable for the great differences existing between different species.
For instance, L, grcefferi, like L, salicaria, is tri- morphous ; while L. thymifolia is dimorphous, and Z. hyssophifolia is homomorphouS.
CUCURBITACE.E.
Of this order we have only a single species, the common Bryony {Bryonia dioica).
What to read after On British Wild Flowers Considered in Relation to Insects?
You can find similar books in the "Read Also" column, or choose other free books by Lubbock, John, Sir, 1834-1913 to read onlineMoreLess
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