226 GLOSSARY. 



Phylon : 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. 



Pilifei'ous : bearing a slender bristle or hair (pilum), 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- 

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



Pinnately lobed, clcjl, parted, divided, c., p. 63. 



J'inndtijid: 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 plantlet 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. 



Pddosperm : the stalk of a seed. 



Pointless: destitute of any pointed tip, such as a mucro, awn, acumincttion, &c. 



Pollen : the fertilixing 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- 

 dles ; p. 112. 



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

 tacle) ; p. 112. 



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

 137, fig. 45, 46. 



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

 different individuals, as the lied Maple. 



Polygonal : many-angled. 



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



Polymerotis : formed of many parts of each set. 

 Polymorphous : of several or varying forms. 



: when the petals arc distinct or separate (whether few er many) : 

 p. 103. 



