41 6 Introduction to Botany. 



Orthot'ropOUS (Gr. orthos, upright; trope, a turning) : applied to an erect 

 ovule or seed having the micropyle at the apex. Fig. 298. 



O'val (L. ovum, an egg) : broadly elliptic. 



O'vary : that part of the pistil which contains the ovules. Fig. 87. 



O'vate : having the outline of a hen's egg, with broader end down. Fig. 223. 



O'void : a solid with an oval outline. 



O'vule : the body which, after the fertilization of the egg, becomes the seed. 

 Fig. 87. Ovulif 'erous (ovule + L. ferre, to bear) : bearing ovules. 



Pal'ate (L. palatum, the palate) : in a bilabiate corolla a projection from the 

 lower lip closing the throat. Fig. 275. 



Pale (L. palea, chaff ) : chaffy scales on the receptacle of some Compositse. 

 The inner bract of a spikelet in the inflorescence of grasses (in this sense 

 most commonly called palet). 



Palea'ceous: chaffy. 



Pal'et : the inner bract in the spikelet of grasses. 



Palisade' cells (L. palus, a stake) : in leaves or stems elongated chlorophyll- 

 bearing cells with long axis perpendicular to the surface. Fig. 36. 



Pal 'mate (L. palma, the hand) : lobed or divided, with the sinuses directed 

 toward the petiole. Figs. 237-239. 



Pal'mately : in a palmate manner. 



Pan'icle (L. panicula, a tuft) : a compound raceme or corymb. 



Pan'icled or panic'ulate : borne in a panicle. 



Papiliona'ceous (L. papilio, butterfly) : having a winged corolla somewhat 

 resembling a butterfly, as found in the pea and locust. Figs. 266 and 267. 



Papil'la, pi. papillae (L. papilla, a nipple) : a minute rounded projection. 



Pap'illose : covered with or resembling papillae. 



Pap'pus (L. pappus, an old man; or a woolly, hairy seed of certain plants) : 

 thistledown; the hairy calyx-limb of certain Compositse. Figs. 316-318. 



Par'asite (Gt.para, beside; sitein, to feed) : an organism subsisting on an- 

 other called the host. 



Parasit'ic : living as a parasite on another organism. 



Paren'chyma (Gr. para, beside; en, in; chein, to pour): applied to cells 

 which are more or less isodiametric. 



Pari'etal (L. paries, a wall or partition wall) : applied to ovules attached to 

 the wall of the ovary instead of to the axis. Figs. 303 and 304. 



Part'ed : cleft nearly to the base or midrib. Fig. 235. 



Par'tial : sometimes used in the sense of secondary. 



Pathogen'ic (Gr. pathos, disease; genos, descent) : producing disease. 



Pec'tinate (L. pecten, a comb) : having narrow close divisions like the teeth 

 of a comb. 



