_Naked_. Lacking organs or parts which are normally present in related species or genera.

_Naturalized_. Said of introduced plants which are reproducing by self-sown seeds.

_Nectariferous_. Producing nectar.

_Node_. The place upon a stem which normally bears a leaf or whorl of leaves.

_Nut_. A hard and indehiscent, 1-celled, 1-seeded fruit.

_Nutlet_. A diminutive nut.

_Oblanceolate_. Lanceolate, with the broadest part toward the apex. Page XII.

_Oblique_. Slanting, or with unequal sides.

_Oblong_. Longer than broad, with sides approximately parallel. Page XII.

_Obovale_. Ovate, with the broadest part toward the apex. Page XII.

_Obovoid_. An ovate solid with the broadest part toward the apex.

_Obtuse_. Blunt or rounded at the apex. Page XII.

_Opaque_. Dull; neither shining nor translucent.

_Opposite_. Said of leaves, branches, buds, etc., on opposite sides of a stem at a node.

_Orbicular_. Circular. Page XII.

_Oval_. Broadly elliptical. Page XII.

_Ovary_. The part of a pistil that contains the ovules. Page XIII.

_Ovate_. Egg-shaped, with the broad end basal. Page XII.

_Ovoid_. Solid ovate or solid oval.

_Ovule_. The part of a flower which after fertilization becomes the seed.

_Palmate_. Radiately lobed or divided; hand-shaped.

_Panicle_. A loose, irregularly compound inflorescence with pedicellate flowers. Page XIV.

_Paniculate_. Arranged in panicles or resembling a panicle.

_Papilionaceous_. b.u.t.terfly-like, as in flowers of the _Leguminosae_.

_Pedicel_. The stalk of a single flower in a compound inflorescence.

_Pedicellate_. Borne on a pedicel.

_Peduncle_. A primary flower-stalk, supporting either a cl.u.s.ter or a solitary flower.

_Pendent._ Hanging downward.

_Pendulous._ More or less hanging or declined.

_Perfect._ Said of a flower with both stamens and pistil. Page XIII.

_Perianth._ The calyx and corolla of a flower considered as a whole.

_Persistent._ Long-continuous, as leaves through the winter, calyx on the fruit, etc.

_Petal._ One of the divisions of a corolla. Page XIII.

_Petiolate._ Having a petiole.

_Petiole._ The stem or stalk of a leaf.

_Petiolulate._ Having a petiolule.

_Petiolule._ The stem or stalk of a leaflet.

_Pilose._ Hairy with long, soft hairs.

_Pinnate._ Compound, with the leaflets arranged along both sides of a common petiole.

_Pistil._ The seed-bearing organ of a flower, normally consisting of ovary, style and stigma. Page XIII.

_Pistillate._ Provided with a pistil, but usually without stamens.

_Pith._ The softer central part of a twig or stem. Page XVI.

_Pollen._ The fecundating grains borne in the anther.

_Polygamo-dioecious._ Sometimes perfect, sometimes unis.e.xual, both forms borne on different individuals.

_Polygamo-monoecious._ Sometimes perfect, sometimes unis.e.xual, both forms borne on the same individual.

_Polygamous._ Sometimes perfect, sometimes unis.e.xual, both forms borne on the same or on different individuals.

_Pome._ A fleshy fruit, as the apple.

_Posterior._ The back side of a flower, next to the axis of inflorescence.

_p.r.i.c.kle._ A small spine growing from the bark.