GLOSSARY 



431 



Pollin'ium. A coherent mass of pollen grains in Orchids and Milkweeds, ar- 

 ranged as to be carried by insects. 



Poly. A prefix of Greek origin meaning many. 



Polyaderphous. Applied to stamens which are united by their filaments into 

 many sets. 



Polyan'drous. Having many stamens. 



Polyan'thous. Many flowered. 



Polyarch. Said of a radial fibro vascular bundle having many xylem and phloem 

 rays. 



Polycar'pellary. Composed of 3 or more carpels. 



Polycar'pic. Fruiting successively. 



PolycephaTic. Bearing many heads. 



Polycotyledon. A plant such as a Conifer which possesses more than 2 cotyle- 

 dons or seed leaves. 



Polyem'bryony. Producing more than one embryo within a seed. * 



Polyg'amous. Applied to species in which staminate, pistillate and herm- 

 aphrodite flowers are borne on the same plant. 



Polyg'onal. Having several or many angles. 



Polymor'phous. Having several to many different forms. 



Polypet'alous. Having distinct, disjoined petals. 



Pclyph'yllous. Many-leaved. 



Polysep'a!ous. Having distinct, disjoined sepals. 



Polys'tachous. Having many spikes. 



Polystem'onous. Possessing many more stamens than petals. 



Pome. A fleshy indehiscent fruit, two or more carpelled, with fibrous cartilag- 

 inous, or stony endocarp, the chief bulk of which consists of an adherent 

 torus. 



Preflora'tion. See Aestivation. 



Prefolia'tion. See Vernation. 



Prick'le. A sharp, rigid outgrowth from the epidermis. 



Primor'dial. First formed. 



Primor'dial U'tricle. The outer plasma membrane. The outer layer of proto- 

 plasm adjacent to the cell wall. 



Procam'bium. The first formed fibro vascular tissue of any organ before differ- 

 entiation has taken place into xylem and phloem. 



Procumbent. Lying flat on the ground. 



Proem'bryo. The primary stage in the development of Char a consisting of a 

 single filament and a long rhizoidal cell. The suspensor in flowering plants. 



Promyce'lium. A short hyphal growth from resting spores of smuts or rusts 

 upon which basidiospores are borne. 



Prosen'chyma. Tissue composed of elongated, taper-pointed cells. 



Protan'drous. A condition of hermaphrodite flowers in which the stamens 

 mature before the carpels. 



