GLOSSARY OF BOTANICAL TERMS. 



42 1 



Physiology. — The science which treats of 

 the functions of organic beings. 



Phytography. — Plant description. 



Phytology. — The science of plants; 

 Botany. 



Pileus. — The cap-like upper portion of the 

 fructification in the Hyraenomycetes. 



Pilose, or Pilous. — Covered with long, 

 straight, soft hairs. 



Pinnate — Applied to compound leases 

 when the leaflets are laterally arranged 

 along a lengthened axis. 



Pi N N ati fi D. — Pinnately-cleft. 



Pi nn ati lob ate — Pinna tely-lobed. 



Pi nn ati partite. — Pinna tely-parted. 



Pinnatisect. — Pinnately-divided. 



Pinni-nerved. — Nerved or simple-veined 

 on the pinnate plan. 



Pinki-netted. — Netted veined on the pin- 

 nate plan. 



Pisiform. — Resembling a pea in shape. 



Pistil. — The modified leaf or leaves which 

 bear the ovules. 



Pistillate. — Applied to flowers that pos- 

 sess pistils but not stamens. 



Placenta. — The ovule-bearing portion of 

 the ovary. 



Placentation. — The arrangement of the 

 placenta;. 



Placentiform. — Circular and flat in shape. 



PLASMODIUM. — A term applied to the proto- 

 plasmic, multinucleated body of one of 

 the Myxomycetes when in the amoeboid 

 stage of development. 



Plasmolysis. — A contraction of the proto- 

 plasm produced by certain reagents. 



Plastid. — A general term for rounded pro- 

 teid bodies such as leucoplastids, chloro- 

 phyll bodies, etc. 



Plerome. — The axile portion of a growing 

 point surrounded by the periblem. The 

 undeveloped central .cylinder. 



Plel renchyma. — A term sometimes applied 

 to woody tissues. 



Plicate. — Folded like a fan. 



Plumose, OR Plimols. — Feathery; branch- 

 ing like a feather. 



Plumule. — The primary bud of the em- 

 bryo. 



Plurifoliolate. — Applied to a compound 

 leaf which has many leaflets. 



Plurilocular. — Having many cavities or 

 loculi. 



Pocl liform. — Shaped like a drinking-cup. 



Podosperm.— The stalk of the ovule or seed. 

 The same as funiculus. 



Pollen. — The fertilizing powder produced 

 by the anther. 



Pollination. — The act of conveying the 

 pollen to the stigma. 



Poi.linium. — A pollen mass. Applied to 

 the masses of united pollen grains of 

 Orchids and some other plants. 



Poly'adelphous. — Applied to stamens 

 which are united by their filaments into 

 many sets. 



Polyandrous. — Possessing many stamens. 



Polyanthous. — Many flowered. 



Polyarch. — A term descriptive of radial 

 fibro-vascular bundles which have many 

 rays. 



Polycarpellary. — Composed of two or 

 more carpels either distinct or united. 



Polycarpic. — Fruiting many times. 



Polycephalols. — Bearing many heads. 



Polycotyledon. — A plant which in embryo 

 possesses more than two cotyledons. 



Polyembryony. — Producing more than 

 one embryo within an ovule. 



Polygamous. — Applied to plants which 

 produce staminate, pistillate and her- 

 maphrodite flowers all on the same 

 plant. 



Polygynous. — Possessing many pistils. 



Polymerous. — Of many parts. Applied 

 to whorls composed of many pieces ; an 

 ovary that is composed of two or more 

 united carpels is also sometimes called 

 polymerous. 



Polymorphous. — Having several or many 

 different forms. 



Polypetalous. — Possessing many petals. 

 Applied by the older botanists to flowers 

 having the petals distinct or ununited. 



Polyphyllous. — Many-leaved. Applied to 

 the calyx or corolla, and also to the leaf- 

 lets of compound leaves. 



Polyrhizal. — Possessing many roots. 



Polysepalous. — Possessing many sepals. 

 Used by the older botanists in the sense 

 of having the sepals distinct or ununited. 



Polyspermols. — Many-seeded. 



Pome. — A fleshy fruit like that of the Apple, 

 which is syncarpous, succulent, and whose 

 bulk is made up chiefly of enlarged and 

 adherent calyx. 

 Porous. — Possessing pores. Applied to 

 the dehiscence of anthers where the pol- 

 len escapes by a minute pore-like open- 

 ing, and to capsules where the seeds 

 escape through similar small openings in 

 the pericarp. 



