GLOSSARY. 385 



Open grown. Said of trees when not grown sufficiently close to 



other trees to be influenced by them. 

 Ovary. The lower or enlarged part of the pistil bearing the 



ovules. 

 Ovate. About twice as long as broad and tapering from near 



the base to the apex. (e. g. leaves of Balm of Gilead.) 

 Ovoid. Egg-shaped. 

 Ovule. A rudimentary seed. 

 Palmate. Said of parts originating from a common point, as the 



veins, lobes or divisions of a leaf. (e. g. Leaflets of Ohio 



Buckeye.) 



Panicle. A loose flower cluster, (e. g. White Ash, page 359.) 

 Papilionaceous. Butterfly-shaped, applied to flowers of the pea 



family, (e. g. Locust, page 334.) 



Paraboloid. The figure of revolution formed by turning a parab- 

 ola about its axis. 

 Parasite. A plant or animal that lives upon and obtains its food 



from other living plants or animals. 

 Parietal placenta. A placenta upon the wall of the ovary, (e. g. 



Coffeetree, page 332.) 

 Parted. Separated nearly to the base. 

 Pedicel. A stalk of a single flower of a flower cluster. 

 Peduncle. A stalk of a solitary flower or the common stalk ~ef a 



flower cluster. 

 Pendulous. Hanging. 

 Penta. Prefix, meaning five. 

 Perennial. A plant living more than two years. 

 Perfect flower. One having both essential organs, i. e. stamens 



and pistil, (e. g. Iowa Crab, page 313.) 

 Perianth. The floral envelopes. 

 Pericarp. The ripened ovary; the seed vessel. 

 Persistent. Remaining beyond the period when such parts gen- 

 erally fall. 



Petal. One of the divisions of a corolla. 

 Petiole. Leaf-stalk. 

 Pinnate. Parts arranged on opposite sides of a main axis. (e. 



g. Leaflets of Mountain Ash.) 

 Pinnatifid. Pinnately lobed or cleft, (e. g. leaves of Red Oak, 



page 296.) 



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