198 
INTRODUCTION TO BOTANY. 
Middle-valved, medivalve , mediis valvls adnalum. Fixed 
along the middle line of the valves. Lathrsea, Parnassia. 
Sutural, ohsuturale , suturce applied turn. Applied over 
against the sutures. Asclepias, Argemone. 
Marginal, viarginale. Fixed solidly either to the edges 
of the valves, or of the partitions when these latter are not 
themselves formed of an enlarged placentarium. CEno- 
thera, Leguminosae. 
Partitiorial, septile. Fixed to the partitions. Ruellia, 
Helianthemum mutabile, Papaver, GEnothera. 
Fastened, adnatum. Fixed throughout their whole 
length, either to the internal surface of the pericarpial ca- 
vity, Orchidess, Lathrsea;' or to the edges of the partitions, 
Tulipa; or the central axis, Ixia Chinensis ; or the edges 
of the valves, Vjola. 
Free, liberum. Totally detached from the pericarp, and 
not adhering to any part when it opens. Plantaginese. 
% Two-parted, bipartitum. Divided into two branches. 
Ribes, Bixa Orellana. 
Three-parted, tripartilum. Orchideae, Passiflora. 
Four- parted, quadripartitum. Parnassia palustris. 
_ Five-parted, quinquepartitum. Argemone Mexicana. 
Many-parted, multipartitim. 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 
portulacese. 
% Two-parting, bipartibile. Splitting, when ripe, into 
two seed-bearing portions, which remain fixed, either to 
the edges of the valves, Leguminosae ; or to the partitions, 
Ruellia. 
Three-parting, tripartibile. Splitting when ripe into 
three seed-bearing portions, which remain attached to the 
edge of the partitions. Liliurn, Roelreuteria. 
Four-parting, &c. 
Remaining, persistens. Not splitting when ripe, but re- 
maining whole. Digitalis, Polemonium, Rhododendrum, 
Swietenia Mahogani. 
One-ribbed, uninerve . 
Two-ribbed, binerve. 
Three-ribbed, trinerve. 
Many-ribbed, multinerve. 
The position of the placentarium may be discovered in 
dry pericarps when the seeds are loose, or have even been 
