GLOSSARY. 313 



Obtuse. Blunt, not acute (e.g. leaflets of Locust). 



Odd-pinnate. Applied to pinnately compound leaves having a 

 terminal leaflet (e.g. Ash). 



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

 other trees to be influenced by them. 



Osiers. A class of willows used for baskets. 



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 Buck- 

 eye). 



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



Papilionaceous. Butterfly -shaped: applied to flowers of the Pea 

 family (e.g. Locust). 



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

 abola about its axis. 



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

 from other living plants or animals. 



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

 Coffee-tree). 



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 of 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). 



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). 



Pistil. The part of the flower bearing the ovules and which ripens 

 into the fruit. 



