organs.

_Orgyalis_, of the height of a man.

_Orthos_, Greek for straight; thus, _Orthocarpous_, with straight fruit;
_Orthostichous_, straight-ranked.

_Orthotropous_ (ovule or seed), 111.

_Osseous_, of a bony texture.

_Outgrowths_, growths from the surface of a leaf, petal, &c.

_Oval_, broadly elliptical, 52.

_Ovary_, that part of the pistil containing the ovules or future seeds,
14, 80, 105.

_Ovate_, shaped like an egg, with the broader end downwards; or, in
plain surfaces, such as leaves, like the section of an egg lengthwise,
52.

_Ovoid_, ovate or oval in a solid form.

_Ovule_, the body which is destined to become a seed, 14, 80, 105, 110.

_Ovuliferous_, ovule-bearing.

_Palate_, a projection of the lower lip of a labiate corolla into the
throat, as in Snapdragon, &c.

_Palea_ (plural _paleae_), chaff; the inner husks of Grasses; the chaff
or bracts on the receptacle of many Compositae, as Coreopsis, and
Sunflower.

_Paleaceous_, furnished with chaff, or chaffy in texture.

_Paleolate_, having _Paleolae_ or paleae of a second order, or narrow
paleae.

_Palet_, English term for palea.

_Palmate_, when leaflets or the divisions of a leaf all spread from the
apex of the petiole, like the hand with the outspread fingers, 57, 58.

_Palmately_ (veined, lobed, &c.), in a palmate manner, 51, 56.

_Palmatifid_, _-lobed_, _-sect_, palmately cleft, or lobed, or divided.

_Paludose_, inhabiting marshes. _Palustrine_, same.

_Panduriform_, or _Pandurate_, fiddle-shaped (which see).

_Panicle_, an open and branched cluster, 81.

_Panicled_, _Paniculate_, arranged in panicles, or like a panicle.

_Pannose_, covered with a felt of woolly hairs.

_Papery_, of about the consistence of letter-paper.

_Papilionaceous_, butterfly-shaped; applied to such a corolla as that of
the Pea, 91.

_Papilla_ (plural _papillae_), little nipple-shaped protuberances.

_Papillate_, _Papillose_, covered with papillae.

_Pappus_, thistle-down. The down crowning the achenium of the Thistle,
Groundsel, &c., and whatever in Compositae answers to calyx, whether
hairs, teeth, or scales, 121.

_Papyraceous_, like parchment in texture.

_Parallel-veined_ or _nerved_ (leaves), 50.

_Paraphyses_, jointed filaments mixed with the antheridia of Mosses.

_Parasitic_, living as a parasite, i. e. on another plant or animal, 37.

_Parenchemytous_, composed of parenchyma.

_Parenchyma_, soft cellular tissue of pl