ae_), x 1. _B_, vertical section of the flower,
x 3. _C_, a stamen: i, from in front; ii, from the side, x 4. _D_,
cross-section of the young fruit, x 2. _E_, flower of sorrel-tree,
_Oxydendrum_ (_Ericaceae_), x 2. _F_, flower of azalea (_Rhododendron_),
x 1/2. _G_, cross-section of the ovary, x 3. _H_, diagram of the flower.
_I_, flower of mountain laurel (_Kalmia_), x 1. _J_, prince's-pine,
_Chimaphila_ (_Pyrolaceae_), x 1/2. _K_, a single flower, x 1. _L_, plant
of pine-sap, _Monotropa_, (_Monotropeae_), x 1/2. _M_, section of a
flower, x 1.]

The second order, the primroses (_Primulinae_), is principally
represented in the cooler parts of the world by the true primrose
family (_Primulaceae_), of which several familiar plants may be
mentioned. The genus _Primula_ includes the European primrose and
cowslip, as well as two or three small American species, and the
commonly cultivated Chinese primrose. Other genera are _Dodecatheon_,
of which the beautiful shooting-star (_D. Meadia_) (Fig. 117, _A_) is
the best known. Something like this is _Cyclamen_, sometimes
cultivated as a house plant. The moneywort (_Lysimachia nummularia_)
(Fig. 117, _D_), as well as other species, also belongs here.

[Illustration: FIG. 117.--_Isocarpous sympetalae_ (_Primulinae_,
_Diospyrinae_). _A_, shooting-star, _Dodecatheon_ (_Primulaceae_), x 1/2.
_B_, section of a flower, x 1. _C_, diagram of the flower. _D_,
Moneywort, _Lysimachia_ (_Primulaceae_), x 1/2. _E_, a perfect flower of
the persimmon, _Diospyros_ (_Ebenaceae_), x 1. _F_, the same, laid open:
section of the young fruit, x 2. _H_, longitudinal section of a ripe
seed, x 1. _em._ the embryo. _I_, fruit, x 1/2.]

The sea-rosemary (_Statice_) and one or two cultivated species of
plumbago are the only members of the plumbago family (_Plumbagineae_)
likely to be met with. The remaining families of the _Primulinae_ are
not represented by any common plants.

The third and last order of the _Isocarpous sympetalae_ has but a
single common representative in the United States; viz., the persimmon
(_Diospyros_) (Fig. 117, _E_). This belongs to the family _Ebenaceae_,
to which also belongs the ebony a member of the same genus as the
persimmon, and found in Africa and Asia.

The second division of the _Sympetalae_ (the _Anisocarpae_) has usually
but two or three carpels, never as many as the petals. The stamens are
also never more than five, and very often one or more are abortive.

[Illu