perpendicular 



petiolary 



perpendic'ular, perpendicula'ris (Lat.), 

 used of an organ with its direction 

 vertical, either (a) to the horizon, 

 or (&) to its attachment ; '^ Sys'- 

 tem, = FiBKO-vAscuLAR System 

 (Crozier). 



perpsam'mic {per, much ; ^diJ./j.05,8SLnd), 

 yielding an abundance of sandy 

 detritus, with the flora thereon 

 growing. 



perpusil'lus (Lat. ), veiy small. 



Per'quadrat, a quadrat of 16 square 

 metres or more. 



persicic'olor {persicum, a peach ; color, 

 colour), persici'uus (Lat.), peach- 

 coloured, a rosy pink. 



persis'tent, per sis' tens (Lat., persever- 

 ing), (1) remaining till the part 

 which bears it is wholly matured, as 

 the leaves of evergreens ; (2) in the 

 culture of Algae, when the supply 

 of prepared water keeps the culture 

 even ; Persis'tence, constancy^ as 

 '-' of Varia'tion, the variety or ten- 

 dency to vary persisting. 



per 'aonate, j^erswia'^ws (Lat., masked), 

 used for a bilabiate corolla having 

 a prominent palate. 



Ferspira'tion (Crozier), see Tran- 

 spiration. 



pertusarloid, resembling the liichen- 

 genua Pertusaria. 



pertu'sate, pertuse', periii'sus (Lat., 

 perforated), having slits or holes. 



Pe'rula (Lat., a little wallet), (1) the 

 scale of a leaf-bud ; (2) Lindley also 

 gives it as a projection in the flower 

 of Orchids, the Mentum ; (3) = 

 Perithecium ; per'ulate, perula'tits, 

 furnished with protective scales. 



perval'var (per = through ; valva, a 

 valve) Az'is, the main longitudinal 

 axis of a Diatom frustule, the line 

 which forms the centre of the 

 dividing plane, penetrates the cell- 

 cavity in the epi- and hypothecal 

 directions at equal distances from 

 the enclosing walls, and unites 

 the centres of the valves (0. 

 Mueller). 



Perver'siim {perversio, a tiu-ning 

 about), (1) turned aside; (2) O, 

 Mueller's term for turned upside 



down in the case of Diatoms ; per- 

 ver'ted, so turned. 



per'vious, per'viics (Lat., passable) 

 having an open passage-way. 



Pes, Ped'is (Lat.), a foot, (1) used in 

 such compounds as longipes, long- 

 stalked ; (2) a foot of twelve inches 

 measurement ± 30*5 cm.; cf. Foot. 



Pet'al, Pet'alum {ireraXov, a flower- 

 leaf), (1) one of the leafy expansions 

 in the floral whorl styled the Co- 

 rolla ; the word was taken by Blair 

 from Columna; (2) of the Hop, the 

 scales of the strobile ; --^ -like, 

 r^ -shaped, petaloid ; petala'tus, 

 possessing petals or a corolla ; 

 petalif erous, bearing petals ; Petali- 

 fica'tion if ado, I make)= PETALODr ; 

 pet'aliform, petaliform'is {forma, 

 shape), petal-shaped; pet'aline, 

 petali'nus, petal-like, or relating to 

 petals; Pet'alode (6l5os,resemblance), 

 an organ simulating a petal ; peta- 

 lo'deus (Lat.), (1) = Petalody ; 

 (2) having petals; Petalo'dy, the 

 metamorphosis of stamens or other 

 organs into petals ; pet'aloid, pe- 

 taloi'deus, like a petal, or having a 

 floral envelope resembling petals ; 

 ~ An'ther, an anther borne on a 

 petal, the filament resembling a 

 petal ; Petaloma'nia {fxavla, mad- 

 ness), an abnormal multiplication of 

 }'etals ; Petaloste'mones {orrii^iwv, a 

 filament), plants with flowers whose 

 stamens are adherent to the corolla ; 

 pet'alous, Blair's term for having 

 petals ; Pet'aly, the condition of 

 possessing petals (J. M. Coulter). 



Pet'aBOspores -cie {virmffos, a broad 

 brimmed hat, -f- Spore), plants 

 having seeds with parachute -like 

 appendages (Clements). 



petiola'ceus {petiohis, a little foot or leg, 

 + ACEUS) (Lat.), having reference 

 to the petiole by attachment, trans- 

 formation, or appearance ; petiola'- 

 neus or petiolea'nus (Mod. Lat.), 

 consisting of the petiole or of some 

 modification of it ; pef'iolans (Lat.), 

 producing petioles ; used by Dr. 

 Burchell ; pet'iolar, pdio'laris, pet'io- 

 lary, borne on, or pertaining to a 



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