208 



Elementary Botany 



OUT 



Outline of leavesj 78 



Oval leaf, 79 



Ovary (Lat. ovum, an egg). The lowest 

 part of the pistil, which, on ripening, 

 forms the fruit, 118 



Ovate (Lat. ovatus, egg-shaped). Ap- 

 plied to leaves which are rounded and 

 broad at the base and tapering at the 

 apex, 79 



Ovule (Lat. diminutive of ovwn^ an 

 egg). The unripened seed, 118, 122 



Oxygen of plant, whence obtained, 35 



PALES (Lat. palea, chaff). The 

 membranous bracts surrounding the 

 flowers of grasses, 187 



Palmate (Lat. pabnatus^ palm-shaped). 

 A leaf with divisions spreading out so 

 as roughly to appear like an outspread 

 hand, 83 ; root, 33 



Panicle (Lat. panicula, the down upon 

 reeds). A compound raceme, g6 



PapilioncLceeB, 162. 



Papilionaceous (Lat. pctpilioy a butter- 

 fly). A special form of irregular co- 

 rolla as seen in the sweet pea, log, 

 162 



Pappus (Lat. thistledown). The divided 

 and hairy calyx as seen in Compo- 

 sitse, which often grows into long 

 hairs crowning the fruit, 105 



Paracorolla (Gr. para, besides, and 

 corolla). An organ which sometimes 

 grows between the corolla and sta- 

 mens, no 



Parallel venation. Venation of leaves 

 of monocotyledons where there are no 

 cross veins forming a network, 74 



Parasite (Lat. fiarasittts, a guest), A 

 plant which obtains its nourishment 

 by growing upon another, 90 



Parenchyma (Gr. paregcheo, to pour 

 in besides). Cellular tissue where the 

 cells are no longer than they are broad, 



Parietal (Lat. paries, a wall). Attach- 

 nient of ovules upon the wall of the 

 ovary, 121 



Paripinnate (Lat. par, equal ; pinna, a 

 feather). Pinnate leaves without an 

 odd leaflet at the end, 81 



Paris, 183 



Parsley, i6g 



Parsnip, i6g 



Pastinacea, i6g 



Patchouly, 174 



Pea, 163, 164 



Peach, 165 



Pedate (Lat. pedatus, furnished with 

 feet). A palmate leaf with the side 

 lobes divided so as to roughly re- 

 semble a bird's foot, 83 - 



Peony, 159 



Pepo (Lat. a gourd). A fruit resembling 

 a berry, but with the outer walls 

 firmer and harder, 141 



PHY 



Perfect. Applied to flowers when both 

 stamens and pistil are present, 100 



Perfoliate (Lat. per, through ; folium, a. 

 leaf). Applied to the real or apparent 

 growth of the stem through the leaf, 



8S 

 Perianth (Gr. perl, around ; anthos, 

 • a flower). Term applied to the calyx 



and corolla, especially amongst mono- 

 cotyledons, when they are alike in 



appearance, in 

 Pericambium (Gr. peri and cambium). 



The cambium in roots from which the 



branches are produced, 31 

 Perigynous {Gr.peri, and^««f, woman). 



Applied to petals and stamens when 



attached around the ovary, 107, 115, 



154, 164 

 Perisperm (Gr. peri, around ; sperma, a 



seed). The albumen formed within 



the ovule outside the embryo-sac, 5, 



127 

 Permanent tissue. That which is no 



longer dividing and increasing in the 



number of its cells, 24 

 Persistent (Lat. Persistens, remaining). 



Applied to any organ which remain 



beyond the usual time of such an 



organ on other plants, as the calyx 



when it remains after fruiting, 104 

 Personate (Lat. persona, a mask). A, 

 ; two-lipped corolla with the two lips 



closed, 109, 174-17S 

 Petal (Gr. petalon, a leaf). One of the 



separate parts of the corolla, loo, 107 

 Petaloidee, 155, 180 

 Petiole (Lat. petiolits, a little foot). The 



stalk of the leaf, 69 

 Petroselimun, i6g 

 Phanerogams (Gr. •fihaneros, apparent ; 



gamos, marriage). Flowering plants, 3 

 Phaseolus, 164 

 Pheasant's Eye^ 157 

 Phelloderma (Gr. phellos, cork ; derma, 



skin). The middle bark of dicotyle- 

 dons, 43, 48 

 Phellogen {Gr.phellos, cork ; ^ennao, to 



produce). The formative tissue from 



which the cork layer is increased in 



thickness, 43 

 phloem (Gr. pkloios, the inner bark of 



trees). The inner bark or liber, 41, 



43, 48 

 Phormium, 183 

 Phosphorus of plant, whence obtained, 



35 

 Phylloclade (Gr. phnllon, a leaf ; 



klados, a branch). A branch which is 



flattened in a leaf-like n^anner, 184 

 Phyllocyanin (Gr. phullon, a leaf ; 



kuanos, blue). The blue colour of 



chlorophyll, 8 

 Phyllode (Gr. phullon, a leaf; eidos, 



form). A petiole which is flattened 



and leaf-like, 70 

 Phylloxanthin (Gr. phullon, a leaf ; 



xanthos, yellow). The yellow colour 



of chlorophyll, 8 



