THE FLOWER 287 
A complete angiospermous seed ovule which has not under- 
gone maturation consists of a NucELLus or body; two coats, the 
outer and inner InTEGUMENTs; and a Funicutus, or stalk. 
Within the nucellus is found the Empryo Sac or MEGASPORE 
containing protoplasm and a nucleus. (See Fig. 221.) 
The coats do not completely envelop the nucellus, but an 
opening at the apex, called the FoRAMEN or MICROPYLE admits 
the pollen tube. The vascular plexus near the point where the 
coats are attached to each other and to the nucellus is called the 
CyuaLaza. The Hirum marks the point where the funiculus is 
joined to the ovule, and if attached to the ovule through a part 
of its length, the adherent portion of the funuculus is called the 
RAPHE. 
Fic. 216.—Forms of Ovules. A, orthotropous. 8B, campylotropous. C, amphi- 
tropous. D, anatropous. (From Gager, redrawn from Gray.) 
Forms or Ovu.es.—The shape of the ovule may be ORTHO- 
TROPous, or straight; CAMPYLOTROPOUS, bent or curved; 
Amputrropous, partly inverted; and ANATROPOUS, inverted. 
The last two forms are most common. <A campylotropous ovule 
is one whose body is bent so that the hilum and micropyle are 
approximated, as the ovule of mustard. 
Tue PLACENTA.—The placenta is the nutritive tissue con- 
necting the ovules with the wall of the ovary. The various types 
of placenta arrangement (placentation) are grouped according 
to their relative complexity as follows: (1) Basilar, (2) Sutural, 
(3) Parietal, (4) Central, (5) Free Central. 
BASILAR PLACENTATION is well illustrated in the Polygonacee 
(Smart Weed, Rhubarb, etc.), in Piper and Juglans. Here, at the 
apex of the axis and in the center of the ovarian base, arises a 
single ovule from a small area of placental tissue. 
