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196 INTRODUCTION TO BOTANY.
carpium, and joining by its edges the two opposite sutures.
Cruciferae.
Doubtful, amhigua. Connected with the centre and
sides of a pericarp that does not open ; and whose origin,
therefore, cannot be determined exactly. Citrus.
Fixed, Jixa. 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, libera. Formed of a placentarium that becomes
free by the dehiscence of the pericarpium. Plantaginese.
Persisting, pershteniia. Remaining in their place after
the opening of the fruit, Cruciferee.
Meeting, olcurrentia. Partial partitions meeting together,
and dividing the cavity of the pericarpium into several
cells. Acanthace^, Antirrhinum, Convolvulacese, Saxi-
frageae.
Whirled, verticillala. Several partial partitions disposed
in the jiericarpium like the spokes of a wheel. Convolvulacese,
Rhodoracese, Aurantiaceae.
Seed-bearing, semhnfera, placentifera. Carrying the
seeds. Ruellia, Nymphsea, 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 lo?igitudi?ial. Lilium, Cruciferae.
PI. 16, %. 8, 14 and J 5.
Phragma. '
A Partition that is transverse. Cassia Fistula. PI. 16,
%. 1.
Placentarium.
^
Placenta, Trophospermum, Spermophorus, Colum, Receptaculum
seminum. That part of the pericarpium toivhich
the seeds are attached. PL 17, fig- 4, 5.
Fleshy, Placeiiiarium carnosum. Vaccinium, Ruta, Saxifraga
granulata.
Corky, suherosum. Centunculus, Anagallis, Hyoscyamus,
Nicotiana, Stramonium.
Leatherlike, coriaceum. Papaver, Begonia.
'Woody^ lignosum. Svvietenia Mahogani.