196 INTRODUCTION TO BOTANY. 
carpium, and joining by its edges the two opposite sutures. 
Cruciferee. . ea, 
Doubtful, ambigua. Connected with the centre and 
sides of a pericarp that does not open; and whose origin, 
therefore, cannot be determined exactly. Citrus. 
Fixed, jiza. ‘ Remaining immoveable, and attached as 
usual when ripe; which seldom takes place except in inde- 
hiscent pericarpiums, or those that open by pores or slits. 
Antirrhinum, Campanula, Papaver, Nigella Saxifraga. 
Free, litera. . Formed of a placentarium that becomes 
free by the dehiscence of the pericarpium. Plantagineze. 
Persisting, persisteniia. Remaining in their place after 
the opening of the fruit, Crucifere. 
Meeting, olcurrentia. Partial partitions meeting together, 
and dividing the cavity of the pericarpium into several 
cells. Acanthaceee, Antirrhinum, Convolvulacese, Saxi- 
frageze. 
Whirled, vertzcillata. Several partial partitions disposed 
in the pericarpium like the spokes of a wheel. Convolvu- 
laceee, Rhodoracez, Aurantiacez. 
Seed-bearing, seminifera, placentifera. Carrying the 
seeds. Ruellia, Nymphea, Helianthemum. 
The distinctions are usually taken from their appearance 
after the pericarpium has split open; but this is frequently 
a bad guide to their original formation. 
SEPTUM. 
A Partition that is longitudinal. Lilium, Cruciferae. 
Pl. 16, fig. 8, 14 and 15. 
PHRAGMA. - 
A Partition that is transverse. Cassia Fistula. Pl. 16, 
fig, 1. 
PLACENTARIUM. \ 
Placenta, Trophospermum, Spermophorus, Colum, Re- 
ceptaculum seminum. That part of the pericarpium to which 
the seeds ave attached. PI. 17, fig. 4, 5. 
Fleshy, Placentartum carnosum. Vaccinium, Ruta, Saxi- 
fraga granulata. 
Corky, sulerosum. Centunculus, Anagallis, Hyoscya- 
mus, Nicotiana, Stramonium. 
Leatherlike, coriacewm. | Papaver, Begonia. 
~ Woody, lignosum. Swietenia Mahogani. 
