GLOSSARY 647 



Oblate. — Flattened at the ends. 



Obovate. — Egg-shaped in outline, with the broader end at the tip. 



Obsolete. — Rudimentary, or entirely absent. 



Obtuse. — Blunt or rounded at the apex. 

 • Ocrece. — Sheathing stipules in Polygonaceae. 



Orbicular. — Approximately circular in outline. 



Orthotropous (ovule). — Straight; hilum at one end and micropyle at the 

 other. 



Ovate. — Egg-shaped in outline; broader end at the base. 



Ovoid . — Egg-shaped . 



Ovule. — The body which becomes the seed after fertilization. 



Palet (palea). — Outer perianth segment of grass flower. 



Palmate. — ^Leaf segments or leaflets radiate from a point like the fingers 

 from the palm of the hand. 



Panicle. — A compound raceme, as in oats. 



Paniculate. — Flowers in panicle or panicle-like inflorescence. 



Papilla. — A small protuberance. 



Papillose. — With papillae. 



Pappus. — Bristle-like, awn-like scaly structures (modified calyx) at the tip 

 of the ovary in Compositae. 



Parenchyma. — A tissue made up of large, thin-walled cells with rather large 

 intercellular spaces. 



Parietal. — Pertaining to the wall; ovules that are attached to the wall of 

 the ovary are said to be parietal. 



Parted. — Separated into parts nearly to the base. 



Parthenocarpy. — A phenomenon in which the fruit matures without fertili- 

 zation of ovules. 



Pedicellate. — Possessing a pedicel. 



Peduncle. — A stalk, either of an individual flower or of the inflorescence. 



Pendant. — Hanging. 



Pentamerous (flower). — Parts in fives. 



Perfect (flower). — Possessing both stamens and pistils; hermaphroditic. 



Perennial. — ^Living from year to year. 



Perianth. — Calyx and corolla taken collectively, or the external floral whorl 

 or whorls. 



Pericarp. — The ovary wall, consisting of three layers: exocarp, mesocarp, 

 and endocarp. 



Perigynous. — Calyx, corolla, and stamens borne on a rim of the receptacle 

 such that they appear on the level with the ovary. 



Perisperm. — Nucellus. 



Petaloid.—'Peta.l-]ike. 



Petiole. — The stalk of a leaf. 



