GLOSSARY. 



in such proportions as not to form 

 an acid ; as the oxide (rust) of iron. 

 Oxygen, a simple gaseous element in 

 its tree state, but entering largely 

 into the composition of various sol- 

 ids and liquids ; it composes 28 of 

 100 parts of atmospheric air and 

 85 of 100 of water. 



Palmate. Hand-shaped; resembling 

 the hand with the angers spread. 



Palustris. Growing in swamps and 

 marshes. 



Panicle. A loose, irregular bunch of 

 flowers with subdivided branches, 

 as the oat. Panicled. Bearing 

 panicles. 



Papilionaceous. Butterfly-shaped, 

 an irregular corolla of four petals ; 

 the upper one is the banner, the two 

 side ones wings, and the lower one 

 the keel, as the pea. Mostly in the 

 class Diadelphia. 



Papillose. Covered with protuberan- 

 ces. 



Pappus. The down of seeds, as the dan- 

 delion ; a feathery appendage. 



Parisitic. Growing on another plant 

 and deriving nourishment from it. 



Parenchyma. A succulent or cellular 

 vegetable substance ; the thick part 

 of leaves between the opposite sur- 

 faces ; pulpy part of fruits, as in the 

 apple, &c. 



Partition. The membrane which di- 

 vides pericarps into cells, called the 

 dissepiment. 



Parted. Deeply divided; more than 

 cleft. 



Pathology, relating to diseases, the dis- 

 eased condition of a body in contra- 

 distinction to the healthy state. 



Pectinate. Like the teeth of a comb, 

 between fimbriate and pinnatifid. 



Pedicel, A little flower-stalk, or par- 

 tial peduncle. 



Peduncle. A stem bearing the flow- 

 er and fruit. 



Pellicle. Thin membranous coat. 



Pendent. Hanging down, pendulous. 



Perennial. Lasting more than two 

 years. 



Perfoliate. Having a stem running 

 through the leaf; differing from 

 connate in not consisting of two 

 leaves. 



Perianth. (From peri, around, and 



anthos, flower.) A sort of calyx. 

 Pericarp. (From peri, around, and 

 karpos, fruit.) A seed vessel or 

 whatever contains the seed. 



Perigynous. From peri, around, and 



gynia, pistil. 



Persistent. Not falling off. Perma- 

 nent. 



Petal. The leaf of a corolla, usually 

 colored. 



Petiole. The stalk which supports the 

 leaf. 



Phenogamous. Such flowers as have 

 stamens and pistils visible, includ- 

 ing all plants except the cryptoga- 

 mous. 



Physiology. A knowledge of nature ; 

 natural functions of organized bod- 

 ies. 



Pinnate. A leaf is pinnate when the 

 leafets are arranged in two rows on 

 the side of a common petiole, as in 

 the rose. Pinnatifid. Cut in a pin- 

 nate manner. It differs from pin- 

 nate, in being a simple leaf deeply 

 parted, while pinnate is a compound 

 of distinct leafets. 



Pistil. Central organ of most flowers, 

 consisting of germ, style, and stig- 

 ma. 



Pistillate. Having pistils but no sta- 

 mens. 



Pit h. Spongy substance in the centre 

 of stems and roots. Medulla. 



Placenta. The internal part of the 

 germ or ovary to which every ovule 

 is attached, immediately or by the 

 funicle, as in the womb. 



Plumose. Feather-like. Pumula or 



Plume. Ascending part of a plant at 

 its first germination. 



Pod. Dry seed-vessel, not pulpy, com- 

 monly applied to legumes and sili- 

 ques. 



Polyandrous. Having many stamens 

 inserted upon the receptacle. 



Polygamous. Having some flowers 

 perfect, and others with stamens 

 only, or pistils only. 



Polymorphous. Changeable, assuming 

 many forms. 



Polypetalous. Having many petals. 



Polyphyllous. Having many leaves. 



Polysepalous. A calyx of more than 

 one leaf, or sepal. 



Pome. A pulpy fruit, containing a 

 capsule, as the apple. 



