254 GLOSSARY 



Per-en'ni-al. Living several years. 



Per'fect flow'er. A flower having both stamens and pistils. 

 Per'i-anth. Calyx or corolla, or. both; the leafy parts of a flower surround- 

 ing the stamens and pistils. 



Per'i-carp. The ripened ovary; the covering of the seed. 

 Pet'al. Part of the corolla. 



Pet' i-ole. The stalk of a leaf connecting the leaf with the stem. 

 Phae'no-ga'mia, or pha-ne-ro-ga'mi-a. Name of that division of the 



vegetable kingdom which bears visible flowers. 

 Pis'til. Organ of a flower, made up of ovary, style and stigma, or ovary 



and stigma. 



Pith. The soft tissue in the centre of the stems of dicotyledonous plants. 

 Pla-cen'ta. The part of a pistil or fruit to which the ovules, or seeds, are 



attached. 



Plu'mule. The first bud of the embryo plant. 

 Pod. A capsule, especially a legume. 

 Pol'len. The fructifying cells borne in the anthers. 

 Pol'len tube. The slender tube sent down from the pollen through the 



style of the pistil to the ovum in the ovule. 

 Pol'li-na'tion. The act of transferring pollen to the stigma. 

 Pol'y-cot'y-le'don-ous. Having many (more than two) cotyledons, as in 



the pines. 



Pol'y-pet'a-lous. Having the petals separate from each other. 

 Pol'y-sep'a-lous. Having the sepals separate from each other. 

 Pome. A fruit like an apple. 

 Pro-cum'bent. Trailing, prostrate. 

 Pro-thal'li-um, pro-thal'lus. The minute primary growth from the spore 



of ferns which bears the true sexual organs. 

 Pro'to-plasm. The primary organic substance of the cell. 

 Pseu'do. False. 



Pter'i-do-phytes/. Ferns and fern-like plants. 

 Pu-bes'cent. Covered with fine short hairs. 



Ra-ceme'. A flower cluster with an elongated axis and many one-flowered 



lateral pedicels. 

 Ra'chis, or rha'chis. The principal axis in a spike, raceme, panicle or 



corymb. 

 Rad'i-cle. The rudimentary stem of a plant which supports the cotyledons 



in the seed, and from which the root is developed downward; a rootlet. 

 Ra'phe. The continuation of the seed stalk along the side of an anatropous 



ovule or seed, forming a ridge or seam. 



