ese cases the so-called inferior ovary is partly axial partly
foliar, _i.e._, sepaline, and partly carpellary in its nature.

Dialysis of the sepals in calyces that are usually gamosepalous has been
most frequently observed in _Rosaceae_, _Pomaceae_, _Umbelliferae_, less
commonly in _Leguminosae_, also in the following genera:--_Primula_,
_Symphytum_, _Gentiana_, _Campanula_, &c.

[Illustration: FIG. 30.--Dialysis of the sepals and petals in _Correa_.]

=Dialysis of the corolla= is likewise of frequent occurrence, either
partially or to such an extent as to render the corolla truly
polypetalous. Among _Labiatae_ the upper lip of the corolla may be often
met with partially cleft, as it is constantly in _Phlomis biloba_, or
more markedly among the _Lobeliaceae_.

In the _Compositae_, a similar separation of the petals is not
infrequent, thus showing frequent transitional stages between the
labiatifloral and tubulifloral divisions respectively. The ligulate
corollas also may often be found in Chrysanthemums, Dahlias, &c., more
or less deeply divided into their component parts.

A more complete separation occurs not unfrequently in _Campanula_,
_Rhododendron_, _Phlox_, _&c._ Figs. 30 and 31 illustrate dialysis of
the corolla; the first in _Correa_, the second in _Campanula_.

[Illustration: FIG. 31.--Dialysis of the corolla in _Campanula sp._,
after De Candolle.]

In the last-named genus, _C. rotundifolia_ has been found with
polypetalous flowers in a wild state in the mountains of Canton
Neufchatel, Switzerland, and gave rise to the creation of a new genus.
This form is now introduced into gardens.

It must be remembered that in some genera, where this separation of the
petals has been met with, there are species in which a similar isolation
occurs normally, as in _Rhododendron_. _R. linearilobum_, a Japanese
species, offers a good illustration of this.

The following list contains the names of the genera in which this
separation of the petals of an ordinarily gamopetalous flower takes
place most frequently.

Correa.
Campanula! sp. pl.
Polemonium.
Phlox!
Coboea!
Rhododendron!
Erica!
Rhodora.
Azalea!
Compositae! sp. pl.
Lonicera!
Convolvulus!
Pharbitis.
Antirrhinum!
Verbascum!
Mimulus.
Digitalis!
Orobanche.
Solanum.
Nicotiana.
Gentiana!
Anagallis.
Primula!
Lamium!
Convallaria!
Lilium!
Colchicum!
&c. &c.

This list does not include t