overview ovules —> seed

	atropous(orthotropous)
	hemitropous
	anatropous
	campilotropous
	amphitropous

R=Raphe (adnate part of funicle) C=Chalaza O=Outer integument I=inner integument

N=Nucellis M=Micropyle F=Funicle P=Placenta

in the keys campylotropous and amphitropous generally not distinguished from anatropous