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 obtains 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. 



