GLOSSARY 
427 
Navic'ular.—Boat-shaped. 
Nec'tar.—A sweet secretion by the flower. 
Nec'tary.—The part of the flower which secretes nectar. 
Nerva'tion.—The arrangement of veins in a leaf. 
Neu'tral.—Said of flowers which possess neither stamens or carpels. Also 
applied to the asexual generation of plants. 
Niv'eous.—Snow-white. 
Node.—The place on the stem which normally shows outgrowths of a leaf, whorl 
of leaves or leaf modifications. 
Nodose'.—Having swollen joints or knobs. 
Nod'ule.—A small rounded body as a root tubercle. 
Nor'mal.—Usual. 
Non—Not. 
Nucel'lus.—The body of an ovule. 
Nuciferous.—Nut-bearing. 
Nu'cleus.—A dense region of protoplasm within the cell containing chromatin 
and usually definitely circumscribed. 
Nucle'olus.—A small body of dense protoplasm within the nucleus. 
Nut.—A dry, indehiscent, i-celled, i-seeded fruit with a stony or leathery 
pericarp. 
Nut'let.—A small nut. The characteristic fruit of the Labiata. 
Nutri'tion.—That branch of Physiology which includes the absorption, distribu¬ 
tion and assimilation of food stuffs. 
Ob.—A prefix of Latin origin signifying inversion. 
Obcon'ical.—Inversely cone-shaped. 
Obcor'date.—Inversely heart-shaped. 
Oblan'ceolate.—Lance-shaped with the broadest part toward the summit. 
Oblate'.—Flattened at the ends or poles. 
Ob'ligate.—Necessary, indispensable. 
Oblique'.—Taking a position between erect and horizontal as in the case of many 
stems. More developed on one side than on the other as in certain leaf 
blades. 
Ob'long.—Longer than broad with nearly parallel sides. 
Obo'vate.—Ovate with the attachment at the narrower end. 
Obtuse'.—Having a blunt or rounded end. 
O'chrea (o'crea).—A sheathing stipule. 
Ontog'eny.—The history of the development of an individual. 
O'ospore.-^The fertilized egg. 
Oper'culum.—The transversely dehiscent lid or cover of a moss capsule. 
Orbic'ular.—Circular. 
O r 'der.—A division of a class containing one or more families. 
Orthot'ropous.—Applied to ovules or seeds which are erect, with the micropyle 
at the -apex and the hilum coinciding with the chalaza, 
