Glossary. 209 



Perianth. The leaves of a flower. Usually applied to those flow. 



ers ia which the calyx and corolla are nearly alike, as the lily. 

 Perennial iadj.^. Persisting from year to year. The term 2->eren- 



nial is commonly understood to designate herbaceous plants 



which live for many years. 

 Pet'al, or Pe'tal. One of the separate parts of the corolla ; an 



inner leaf of a flower. 

 Petiole. The stem of a leaf. 

 Phenogam. One of the class of flowering plants. These plants 



propagate by seed. 

 Pip. A term applied to certain small seeds or seed-like fruits of 



berries and other fruits . 

 Piping. A cutting. 

 Pistil. That portion of the flower which receives the pollen and 



bears the seeds. It always has two parts, the stigma and the 



ovary, and these are usually connected by a style. It is the 



female organ of the plant. 

 Pistillate. Bearing pistils alone ; female. 

 Plantlet. The little plant just emerged from the seed. It 



becomes a plant when it is able to assimilate and lead an inde- 

 pendent existence. 

 Pod. A dry seed-vessel which splits open at maturitj?^ ; capsule. 

 Pollen. A product of the anthers which is capable of fertilizing 



the stigma. It is usually granular and powdei-y. 

 Pollination. The conveyance of pollen from the anther to the 



stigma. 

 Polygamous. Said of plants or species which bear both perfect 



and imperfect flowers. 

 Pome. A fleshy fruit with a papery core surrounded by a greatly 



thickened calyx, as the apple, quince, etc. 

 Race. A fixed variety ; that is, a variety which reproduces itself 



more or less uniformly from seeds. 

 Raceme. A more or less elongated and simple flower-cluster 



with one-flowered pedicels. 

 Regermination. Second germination. Seeds which have been 



checked after germination has begun may resume the process 



under favorable conditions. 

 Root. A part of the plant which bears neither leaves nor buds, 



and which absorbs nourishment for the plant, or serves as a 



support for it. It may be subterranean or aerial. 



