=Lemma.= One of the bracts in the spikelet of a gra.s.s, and described in the treatment of that family.

=Membranous.= Thin or membrane-like in texture.

=Monoecious.= Bearing stamens and pistils in separate flowers, but on the same plant.

=Mucronate.= Tipped with a short small abrupt tip.

=Node.= A joint of a stem, at which leaves are borne and branches appear.

=Oblanceolate.= Reversed lanceolate in shape.

=Oblique.= With unequal sides.

=Oblong.= Somewhat rectangular in shape, with parallel sides.

=Oblong-lanceolate.= Intermediate in shape between oblong and lanceolate.

=Oblong-spatulate.= Intermediate in shape between oblong and spatulate.

=Obovate.= Reversed ovate in shape.

=Obtuse.= Blunt-tipped; terminating in an obtuse angle.

=Odd-pinnate.= A compound leaf terminating in a single leaflet.

=Once-compound.= A compound leaf bearing leaflets at the end or along the sides of the main axis.

=Once-pinnate.= A compound leaf bearing leaflets along the sides of the axis.

=Open sheath.= A leaf-sheath with separate margins.

=Opposite.= Situated in pairs on opposite sides of the stem or axis.

=Ovary.= The basal, usually swollen portion of the pistil, within which the seeds are produced.

=Ovate.= Egg-shape in outline.

=Ovate-lanceolate.= Intermediate in shape between ovate and lanceolate; broadly lanceolate or narrowly ovate.

=Ovate-oblong.= Intermediate in shape between ovate and oblong.

=Ovoid.= Egg-shape.

=Palmate.= With several organs or structures attached at or proceeding from the same point; applied chiefly to the arrangement of princ.i.p.al veins in a leaf and of leaflets in a compound leaf.

=Panicle.= A loose, more or less irregular, branching cl.u.s.ter of pedicelled flowers, usually much longer than thick.

=Parallel-veined.= With the princ.i.p.al veins of the leaf paralleling each other from the base to the apex, or (rarely) from the mid-rib to the margin.

=Pedicel.= The stalk of a single flower.

=Parasite.= A plant which grows attached to another and derives its nourishment from it.

=Peduncle.= The stalk of a flower-cl.u.s.ter, or of a solitary flower.

=Peltate.= Attached to the stalk by the lower surface, instead of the margin.

=Perennial.= Living through several seasons.

=Perfect.= Bearing stamens and pistils in the same flower.

=Perfoliate.= Clasping the stem so completely that the stem seems to pa.s.s through it.

=Perianth.= The calyx and corolla of a flower.

=Perigynium.= A sac-like structure surrounding the achene of a sedge.

=Persistent.= Remaining attached for a considerable time.

=Petal.= One member or segment of the corolla.

=Petiole.= The stalk of a leaf.

=Pinnate.= With several organs or structures attached at the sides of an axis or stalk; applied chiefly to the arrangement of the princ.i.p.al veins in a leaf and of leaflets in a compound leaf.

=Pinnatifid.= Deeply pinnately cut or divided.

=Pistil.= The central portion of a flower, consisting of ovary, style, and stigma; the seed-bearing part of the flower.

=Pistillate.= Bearing pistils.

=Polygamous.= Applied to plants in which some flowers are perfect and others either staminate or pistillate.

=p.u.b.escent.= Hairy.

=Raceme.= A more or less elongated flower-cl.u.s.ter, bearing pedicelled flowers along a single axis.

=Racemose.= Arranged in racemes.

=Receptacle.= The end of a peduncle or pedicel upon which the organs of a flower, or the flowers of a head, are attached.

=Recurved.= Curved back.

=Reflexed.= Abruptly bent back or down.

=Regular.= Uniform in shape or structure. Flowers are generally considered regular when all the petals are of the same size and shape.

=Retrorse.= Directed backward or downward.