retrorse 
Rhizines 
pistils converted into stamens or 
petals. 
retrorse’, retror’sum (Lat.), directed 
backward or downward; retror’sely 
acu‘leate, with prickles turned 
back or down, as in Galium 
Aparine, Linn. 
retroser’rate (retro, backward, ser- 
ratus, sawed)==RUNCINATE ; 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, Rever’sio, a change back- 
ward, as to an earlier condition. 
revolu’bilis (Lat.), capable of being 
rolled back; revolute, revolu'tus 
(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), = Crr- 
CUMNUTATION. 
Rhabarb’arin, a proximate principle 
of rhubarb ; rhabarbari‘nus, rhu- 
barb-coloured, the colour of the 
officinal root, orange brown. 
Rhab’doid (fa8dos, a staff, eldos, 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 (Ai@os, a stone), a detached 
portion of a Rhab’dosphere («¢aipa, 
a sphere), applied to certain pela- 
gic Algae, Rhabdosphaera Tubifer 
and R. Claviger, G. Murr. and 
Blackm. 
Rhab’dus + the stipe of some Fungi 
(Lindley). 
Rhache’ola (paxis, a backbone), = 
R#acHILua; Rhachil'la, 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.; Rham’nin, the colouring 
matter of the same fruit. 
Rha’phe (ja¢7, a seam), usually 
spelled RaPHeE. 
Rhaph'is, pl. Rhaph‘ides (fadis, a 
needle), more usually occurring as 
RapuHis and RAPHIDES. 
Rhe’gma, = Reema. 
Rhe’ine, a proximate principle of the 
officinal rhubarb, Rheum. 
Rheot’ropism (jéw, I flow, rpor7, a 
turning), the phenomena in a 
growing organism produced by the 
influence of a current of water 
(Jénsson) ; adj. rheotrop‘ic. 
rhexigenet‘ic (jyés, a rending, yévos, 
offspring), the origin of tissues 
whenformed by mechanical rupture 
(De Bary); rhexolyt’ic (Avous, a 
loosing), when gemmae are de- 
tached by the rupture of a cell and 
the disorganization of its contents 
(Correns), 
Rhipid’‘ium (furls, piridos, a fan), a 
fan-shaped cyme, the _ lateral 
branches being developed alter- 
nately in two opposite directions. 
rhizamor’phoid, = RHIZOMORPHOUS. 
rhizan’thous, -thus (pifa, a root, avdos, 
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 Ruizorp in the oophore 
condition (Bower). 
Rhizi’na, pl. Rhizi’nae, or Rhiz’ines, 
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