226 GLOSSARY. 



Phyton : a name used to designate the pieces which by their repetition make up 



a plant, theoretically, viz. a joint of stem with its leaf or pair of leaves. 

 Piliferous: bearing a slender bristle or hair (p'dum), or beset with hairs. 

 Pilose : hairy ; clothed with soft slender hairs. 

 Pinna : a primary branch of the petiole of a bipinnate or tripinnate leaf, as fig, 



130, p. 66. 



Pinnule : a secondary branch of the petiole of a bipinnate or tripinnate leaf; p. 66. 

 Pinnate (leaf) : when the leaflets are arranged along the sides of a common pe- 

 4 tiole ; p. 65, fig. 126 - 128. 

 P innately lobed, cleft, parted, divided, &c., p. 63. 

 Pinndtifid: same as pinnately cleft; p. 63, fig. 119. 

 Pistil: the seed-bearing organ of the flower ; p. 86, 116. 

 Pistillidium : the body which in Mosses, Liverworts, &c. answers to the pistil. 

 Pitchers, p. 51, fig. 79, 80. 



Pith: the cellular centre of an exogenous stem ; p. 150, 151. 

 Pitted : having small depressions or pits on the surface, as many seeds. 

 Placenta : the surface or part of the ovary to which the ovules are attached ; 



p. 118. 



Plaited (in the bud) ; p. 76, fig. 150; p. 110, fig. 225. 

 Plane: flat, outspread. 

 . Plicate : same as plaited. 

 Plumose: feathery; when any slender body (such as a bristle of a pappus) is 



beset with hairs along its sides, like the plumes or the beard on a feather. 

 Plumule : the little bud or first shoot of a germinating plantlct above the cotyle-. 



dons ; p. 6, fig. 5 ; p. 137. 

 Pluri-, in composition : many or several ; as 

 Plurifoliolate : with several leaflets ; p. 66. 



Pod: specially a legume, p. 131 ; also applied to any sort of capsule. 

 Ptfdosperm : the stalk of a seed. 



Pointless: destitute of any pointed tip, siich as a mucro, awn, acumination, &c. 

 Pollen : the fertilizing powder of the anther ; p. 86, 114. 

 Pollen-mass : applied to the pollen when the grains all cohere into a mass, as in 



Milkweed and Orchis. 

 Poly- (in compound words of Greek origin) : same as multi- in those of Latin 



origin, viz. many ; as 

 Polyadelphous : having the stamens united by their filaments into several bun. 



dies; p. 112. 



Polydndrous : with numerous (more than 20) stamens (inserted on the recep- 

 tacle) ; p. 112. 

 Polycotyle'donous : having many (more than two) cotyledons, as Pines; p. 17, 



137, fig. 45, 46. 

 Polygamous : having some perfect and some separated flowers, on the same or on 



different individuals, as the Red Maple. 

 Polygonal : many-angled. 



Polygynous : with many pistils or styles ; p. 116. 

 Polymerous : formed of many parts of each set. 

 Polymorphous : of several or varying forms. 

 Polype'talous ; when the petals are distinct or separate (whether few or many) ; 



p. 103. 



