retrorse 



Rhizinea 



pistils converted into stamens or 

 petals. 



retrorse', retrod sum (Lat.), directed 

 back ward or down ward; retror'sely 

 aculeate, with prickles turned 

 back or down, as in Galium 

 Aparine, Linn. 



retroser'rate (retro, backward, ser- 

 ratus, sawed ) = RUNCIN ATE ; retro- 

 ver'ted, retrover'sus, inverted ; 

 Retrover'sio (Lat. ), an inversion. 



Ret'ting, steeping flax or hemp in 

 water to obtain the fibro- vascular 

 portion freed from the cellular. 



retuse', retu'sus (Lat., blunted), with 

 a shallow notch at a rounded apex. 



reversed', rever'sus (Lat., turned 

 back), upside down, resupinate ; 

 Rever'sion,7?et;er / ^o, a change back- 

 ward, as to an earlier condition. 



revolu'bilis (Lat.), capable of being 

 rolled back ; rev'olute, revolu'lus 

 (Lat. ), rolled back from the margin 

 or apex ; revoluti'vus (Lat. ), in 

 aestivation when the edges roll 

 back spirally on each side, as in 

 Rosemary. 



Revol'ver Flow'ers, Kerner's term for 

 those flowers "which exhibit 

 within their outer portals a number 

 of fine tubes resembling the barrels 

 of a revolver. " 



revol'ving Nuta'tion (Sachs), = CIR- 



CUMNUTATION. 



Rhabarb'arin, a proximate principle 

 of rhubarb ; rhabarbari'nus, rhu- 

 barb-coloured, the colour of the 

 officinal root, orange brown. 



Rhab'doid (/ki/35os, a staff, eI5os, re- 

 semblance), a rod-shaped body 

 found in the cells of the tentacles 

 of Drosera, and in the mesophyll 

 cells of Dionaea, becoming more 

 spherical on stimulation ; Rhab'- 

 dolith (Xt'0os, a stone), a detached 

 portion of a Rhab'dosphere (<r$cu/ra, 

 a sphere), applied to certain pela- 

 gic Algae, Rhabdosphaera Tubifer 

 and R. Claviger, G. Murr. and 

 Blackm. 



Rhab'dus J the stipe of some Fungi 

 (Lindley). 



Rhacne'ola (pa%is, a backbone), = 



RHACHILLA; RhachiTla, a secondary 

 axis in the inflorescence of grasses ; 

 Rha'chis, Rach'is, the axis of an in- 

 florescence or compound leaf or 

 frond. 



rhamna'ceous, resembling or belong- 

 ing to Rhamnaceae. 



Rham'nase, an enzyme acting upon 

 glucosides which occurs in the 

 berries of Rhamnus infectoria, 

 Linn, j Rham'nin, the colouring 

 matter of the same fruit. 



Rha'phe (pa<t>ri, a seam), usually 

 spelled RAPHE. 



Rhaph'is, pi. Rhaph'ides (pa&s, a 

 needle), more usually occurring as 

 RAPHIS and RAFHIDES. 



Rhe'gma, = REGMA. 



Rhe'ine, a proximate principle of the 

 officinal rhubarb, Rheum. 



Rheot'ropism (ptw, I flow, rpoir^, a 

 turning), the phenomena in a 

 growing organism produced by the 

 influence of a current of water 

 (Jonsson) ; adj. rheotrop'ic. 



rhexigenet'ic (prjfc, a rending, yevos, 

 offspring), the origin of tissues 

 when formed by mechanical rupture 

 (De Bary) ; rhexolyt'ic (\<rts, a 

 loosing), when gemmae are de- 

 tached by the rupture of a cell and 

 the disorganization of its contents 

 (Correns). 



Rhipid'ium (purls, piiridos, a fan), a 

 fan-shaped cyme, the lateral 

 branches being developed alter- 

 nately in two opposite directions. 



rhizamor'phoid, = BHIZOMORPHOUS. 



rhizau'thous, -thus (pta, a root, av6os, 

 a flower), root-flowered, flowering 

 from the root or seeming to do so ; 

 cf. RADICALIS; Rhi'zanths, plants 

 so characterised, RHIZOGENS ; rhiz- 

 auto'icous, in Mosses when the 

 male inflorescence is on a short 

 branch, cohering to the female by 

 a rhizoid ; Rhi'zel, Van Tieghem's 

 term for the "base" of the root, 

 that is, the root apart from its 

 radicles ; Rhizid'ium, term sug- 

 gested for RHIZOID in the oophore 

 condition (Bower). 



Rhizi'na, pi. Rnizi'nae, or RMz'ines, 



225 



