42 SUB-ALPINE PLANTS 



PEDICEL, the stalk of a flower in a compound inflorescence. 

 PEDUNCLE, the stalk of an inflorescence, or of a solitary flower. 

 PELTATE, applied to leaves which are more or less round, with the 



stalk in the middle (Hydrocotyle). 

 PERFOLIATE, when the stem passes through a pair of leaves, as in 



Chlora perfoliata. 

 PERIANTH, the floral envelope replacing the calyx and corolla in 



the Monochlamydeae and Monocotyledons ; e.g. the flower 



of a Crocus. 



PERICARP, the wall of the developed ovary as seen in the fruit. 

 PERENNIAL, lasting more than two years. 

 PERSISTENT, not falling off. 

 PETAL, a unit of the corolla. 

 PETALOID, in the colour or form of a petal. 

 PETIOLATE, having a leaf-stalk. 

 PETIOLE, a leaf-stalk. 

 PHANEROGAM, a flowering plant. 

 PILOSE, sparsely covered with rather long hairs. 

 PINNATE, when several segments succeed each other on each side 



of a petiole, compared to the branches of a feather. 

 PINNATIFID, lobed in a pinnate manner. 

 PISTIL, the portion of the flower comprising the ovary, style, and 



stigma. 



PLACENTA, the portion of the ovary to which the ovules are attached. 

 POLLEN, fertilising powder contained in the anthers. 

 POLLINATION, the act of dusting the stigma with pollen. 

 POLLINIUM, the pollen-mass of an Orchid. 

 POLYGAMOUS, bearing hermaphrodite and unisexual flowers at the 



same time. 



POLYMORPHIC, variable in shape or form. 



POLYPETALOUS flowers having the petals free from one another. 

 PREMORSE, bitten off. 



PRICKLE, a sharply pointed excrescence on a branch or leaf, etc. 

 PTERIDOPHYTES, Fern plants. 

 PUBERULENT, feebly pubescent. 

 PuBESCENT, p downy, furnished with fine, soft, short hairs. 



RACEME, an inflorescence in which stalked flowers are borne on a 



central stem, the lowest flowers opening first. 

 RACHIS, the stalk of a compound leaf ; the primary axis of certain 



kinds of inflorescence. 

 RADICAL, springing from the root. 

 RADICLE, the embryo root. 



RAY FLORETS, the outer flowers of the Composite ; cf . Disc Florets. 

 RECEPTACLE, the top portion of the axis of a flower which bears 



the floral envelope and the male and female organs ; also the 



axis bearing the florets in Composite, 



