230 GLOSSARY OF BOTANICAL TERMS. 



tube, a small tube emitted by the pollen grain when applied 



to the surface of the stigma, and communicating with the 



ovules. 



POLLINIA, the pollen masses in Orchids. 



POLYADELPHOUS, stamens united into three or more bundles. 

 POLYANDROUS, having twenty or more stamens. 

 POLYSEPALOUS, POLYPETALOUS, calyx or corolla composed of many 



segments. 

 POME, an apple or pear ; a many-seeded fleshy fruit, crowned by 



the calyx. 



POROUS, having apertures or small roundish holes. 

 POSTERIOR, the part of a flower next the axis. 

 PRICKLES, hardened sharp processes belonging to the epidermis. 

 PRIMORDIAL, usually applied to the first leaves or flowers. 

 PRIMINE, the -outer coat of the ovule, 

 PRISMATIC, having the form of a prism. 

 PROCUMBENT, lying on the ground. 

 PROEMBRYO, the green leafy body emanating from the spores of 



Ferns. 



PROLIFEROUS, producing many young plants at the base. 

 PROSENCHYMA, fibrous tissue with acute extremities, or woody 



fibre. 

 PROTHALLUS, the germ frond of a fern on which the fertilizing 



organs are produced. See PROEMBRYO. 

 PRUINOSE, covered with a granular secretion, giving a fine bloom 



to several fruits. 



PUBESCENT, having closely adpressed, short, soft hairs. 

 PULVINATE. in the form of a cushion. 

 PULVERULENT, covered with fine powdery dust. 

 PUNCTATE, marked with minute spots or dots. 

 PUTAMEN, the hardened endocarp, as the stone of the chewy, &c. 

 PYRIFORM, pear-shaped. 



QUADIFARIOUS, arranged in four rows. 

 QUATERISTATE, arranged in fours from one point. 

 QUINARY, arranged in fives, 

 QUINQUEFID, divided into five. 



RACEME, flowers as in a spike, but with pedicels. 



RACHIS, the central stem on which the flowers are seated in 



Grasses; the petiole of a pinnate leaf bearing the leaflets - y 



also the mid-stalk of the frond in Ferns on which the pinnae 



are situated. 

 RADIATE, when the flowers of the circumference are larger than 



those of the disk, and spread like rays, as in the Daisy. 

 RADICAL, springing from the root. 



RADICLE, the point in the embryo from which the root grows. 

 RAMENTA, little brown scales on ferns. 

 RAMULI, small twigs, or little branches. 



