FLORA
OF
NORTH AMERICA.
EXOGENOUS OR DICOTYLEDONOUS PLANTS
CONT I NUED.
S e c t i o n II. MONOPETALOUS EXOGENOUS^ PLANTS.
Floral envelopes consisting of both calyx and corolla; the
latter composed of united petals* (monopetalous or gamope-
talous).
I. Calyx adherent to the ovary (ovary inferior).^
CONSPECTUS OF THE ORDERS IN THIS DIVISION.
* Ovary .with 2 or more cells, and 1—many ovules in each, or by abortion
1-celled. Stamens inserted upon the corolla. Seeds albuminous. Leaves
opposite.
Stipules none. 72. Caprifoliaceje.
Stipules inlerpetiolar, or simulating the leaves. 73. Rubiaceæ.
Stipulés'1? 1 to 3 on each side, entirely similar to the
leaves and forming with them a verticil. Subord, Stellatæ.
Stipules between the petioles.
Ovary coherent. Subord. Cinchoneæ.
Ovary nearly free from the calyx. Subord. L oganieæ.
* A few Ericaceae, a portion of Plumbaginaceae, some Aquifoliaceae, &c., are
polypetalous, or nearly so.
t In a few Rubiaceae the ovary is partly, and in the suborder Loganie* completely,
free from the calyx: in some Dipsacese the apex of the ovary is coherent
with the calyx, while the lower portion is free. On the, other hand, one or two genera
with an adherent calyx, such as Vaccinium, Hopea, and Halesia, belong to orders
which have for the most part a free ovary.
VOL. II.—I