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198 INTRODUCTION TO BOTANY.
Mid.dle-valved, medivalue, mediis valvis adnatum. Fixed
along the middle line of the valves. Lathrsa, Parnassja.
Suturalj ohsuturale, mturcB applicatum. Applied over
against the sutures. Asclepias, Argemone.
Marginal, marglnale. Fixed solidly either to the edges
of the valves, or of the partitions when these latter are not
themselves formed of an enlarged placentarium. CEnothera,
Leguminosas.
Fartitiojial, septlle. Fixed to the partitions. Ruellia,
Helianthemum mutabilej Papaver, CEnothera.
Fastened, adnatiwi. ' Fixed throughout their v/hoie
length, either to the internal surface of the pericarpial ca-
vit;/, Orchidese, Ladir^a; or to the edges of the partitions,
Tulipa; or the central axis, Ixia Chinensis; or the edges
of the valves, Viola.
Free, liherimi. Totally detached from the pericarp, and
not adhering to an%part when it opens. Plantaginess.
% Two-parted, bipartiium. Divided into two branches.
Ribes, Bixa Orellana.
Three-parted, iripartilum. Orchidese, Passiflora.
Four- parted, quadripart'ilum. Parnassia palustris.
Five-parted, quinijuepurtiium. Argemone Mexicana.
Many-parted, midlipartiLum. Papaver, Punica.—These
divisions of the placentarium are usually fastened to the
sides of the pericarpial cavity, but sometimes they are only
attached to the pericarpium by their extremities, as in the
portulacea3.
51 Two-parting, hipartihile. Splitting, when ripe, into
two seed-bearing portions, which remain fixed, either to
the edges of the valves, Leguminosae ; or to the partitions,
Rueliia.
Three-parting, tripariilnle. Splitting when ripe into'
three seed-bearing portions, which remain attached to the
edge of the partitions. Lilium, Koeireuteria.
Four-parting, &c.
Remaining, persis/ens. Not splitting when ripe, but remaining
whole. Digitalis, Polemonium, Rhododendrum,
Swietenia Mahogani.
51 One-ribbed, unmerve.
Two-ribbed, hlnerve.
Three-ribbed, trinerve.
Many-ribbed, mult'merve.
The position of the placentarium maybe discovered in
dry pericarps when the seeds are loose, or have even been