Origin of Species Variorum

→ varieties. 1859 1860 1861

varieties, and Naudin has come to the same conclusion. 1866 1869 1872

→ of the same species of Verbascum when 1859 1860 1861 1866

OMIT 1869 1872

→ when fertilised with pollen from their own coloured flowers. 1859 1860 1861

when fertilised with pollen from its own coloured flowers. 1866

of the same species. 1869 1872

↑ 1 blocks not present in 1859 1860 1861 1866; present in 1869 1872

Mr. Scott, also, has experimented on the species and varieties of Verbascum; and although unable to confirm Gärtners results on the crossing of the distinct species, he finds that the dissimilarly coloured varieties of the same species yield fewer seeds, in the proportion of 86 to 100, than the similarly coloured varieties.

→ of Verbascum present no other difference besides the mere 1859 1860 1861 1866

differ in no respect except in the 1869 1872

thirteen flowers of the one

kind with

with the

pollen of the other; but only a single head produced any seed, and this one head produced only five grains. Manipulation in this

case

ease

could not have been injurious, as the plants have separated sexes. No one, I believe, has suspected that these varieties of maize are distinct species; and it is important to notice that the hybrid plants thus raised were themselves perfectly fertile; so that even Gärtner did not venture to consider the two varieties as specifically distinct.

Girou de Buzareingues crossed three varieties of gourd, which like the maize has separated sexes, and he asserts that their mutual fertilisation is by so much the less easy as their differences are greater. How far these experiments may be trusted, I know not; but the forms

experimentised

experimented

on,

are ranked by

Sageret,

Sagaret,

who mainly founds his classification by the test of infertility, as →varieties.

The following case is far more remarkable, and seems at first

~~quite~~

quite

incredible; but it is the result of an astonishing number of experiments made during many years on nine species of Verbascum, by so good an observer and so hostile a

witness,

witness

as Gärtner:

namely

namely,

that

the yellow

yellow

and white varieties →of the same species of Verbascum when

when crossed

intercrossed

produce less

seed

seed,

than

does either

the similarly

do either

coloured

variety

varieties

→when fertilised with pollen from their own coloured flowers. Moreover, he asserts

that,

that

when yellow and white varieties of one species are crossed with yellow and white varieties of a distinct species, more seed is produced by the crosses between the

same

similarly

coloured flowers, than between those which are differently coloured. ↑ Yet these varieties →of Verbascum present no other difference besides the mere colour of

their

the

flowers;

flower;

and one variety can sometimes be raised from the seed of

~~the~~

the

another.

other.