Page 23 - Pharmacognosy-I (02-06-06-102)

line. Raphe is absent in this type. This type is relatively uncommon; being
found, for example, in Piperacea, Cannabinacea, Polygonaceae, etc.

B- Anatropous: The most common type, in which the ovule is inverted , i.e,
bent upon the funicle and fused with it so the micropyle is near the placenta
and the raphe runs from one end to the other as e.g.Linseed and Cardamom

C- Amphitropous ovule : The ovule is partialy bent(90°) so that the
micropyle and the chalaza are on one line at right angle to the free funicle or
hilum; thus, the raphe runs from the chalaza to half the distanc to the
micrppyle e.g. Colchicum seeds.

D. Campylotropous ovule: The whole ovule is bent upon itself instead of
upon the funicle so that the funicl, chalaza and micropyle are all close to one
another, and no raphe is present. In this type, the nucellus is curved due to a
rapid growth of one side of the nucellus and of the chalaza ; while
development of the other side of the ovule being almost arrested.
e.g.Stramonium seed.

m ch

e.s

n

ch m
fM
f
F Anatropous Ovule

c Atropous Ovule

m Ch
Ch m

f f
F
Campylotropous Ovule
Amphitropous Ovule
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