RacMlla 



Radioes 



Rachiria = Rhachilla. 



rachimor'phus (A^X'^j t^® backbone ; 

 fiop<p^, shape), the small zigzag 

 flowering axis of some grasses, as 

 Rottboellia; preferably rhachimor'- 

 phouB. 



Ka'chis = Rhachis ; Ea'cheae, used 

 by J. Smith as the plural of Rachis ; 

 ra'chifonii=RHACHiDiFORM; Eachi'- 

 tis, in botany, a disease producing 

 abortion in the flower or seed. 



ra'dial, radia'lis {radius, the spoke 

 of a' wheel), (1) radiating, as from 

 a centre ; (2) belonging to the ray, 

 as in the flowers of Composites ; 

 (3) = ACTiNOMORPHic; '^ Bun'dle, 

 a bundle or stele which has strands 

 of bast and wood in different radii, 

 a frequent occurrence in roots ; 

 -^ Plane, any plane which passes 

 through the axis of growth, and 

 cuts the surface at right angles ; 

 '- Strand, large cells forming with 

 the hypodermal strand in the stem 

 of Bryophytes, wedge-shaped masses 

 of tissue (Tansley) ; -^ Sym'metry, 

 cf. RADiosYMMETRic; ra'dio-ao'tive, 

 applied to substances which give off 

 emanations of radium ; Badiat'rop- 

 ism, the influence of radioactive 

 minerals upon plants, neg'atiye or 

 pos'itive, inhibiting growth or 

 favouring it ; adj. radiatroplc ; 

 ra'diant, rad'ians, radiating as from 

 a centre ; --' Um'bel, when flowers 

 on the outside are conspicuously 

 larger than those which form the 

 rest of the umbel ; ra'diar, a system 

 of branching uniformly on all sides 

 (Goebel) ; ra'diate, radia'tus, (1) 

 spreading from or arranged round a 

 common centre, as the circumference 

 of a circle ; (2) bearing rays, or rav- 

 florets ; -- -veined = palmately 

 veined; ra'diating, passing in a 

 straight line from the centre ; 

 radia'tiform, radiatiform'is {forma, 

 shape), when the ligulate florets of 

 Compositae increase in length out- 

 wards; radla'i;im <Lat.), in a radiate 

 manner; Badia'tion, used in a special 

 sense as the emanation of radio- 

 active agents upon plants. 



rad'ical, radica'lis {radix, radiciSy a 

 root), arising from the root, or its 

 crown; radlocmt, radi'cans (Lat., 

 striking root), rooting, usually ap- 

 plied td stems or leaves ; rad i- 

 cated, having a root or roots' 

 (Crozier) ; radicating, rooting ; 

 Radica'tion, Radica'tio, the root- 

 system of a plant, its disposition 

 and branching; radioa'tuB (Lat.), 

 possessing roots, especially a tap- 

 root ; Eadlcel, Badicel'la, =s Radi- 

 cuLA ; Eadicella'tio (Lat.) = Hadi- 

 CATiON ; radicic'olouB, -la {eolo, I 

 inhabit), (1) when th* flower is 

 seated immediately upon the crown 

 of the root ; (2) dwelling in the 

 root as a parasite ; radioif 'eroni 

 {fero, I bear), root-bearing, or 

 rooting, as prostrate stems ; radi~ 

 eiflor'oui, -rtw {fios, floriSy a flower), 

 flowering apparently from the root ; 

 radio'iform {forma, shape); r»di- 

 oi'noB (Lat.), of the nature or 

 appearance of a root ; Ead'iol«, 

 Radfcula, the hypocotyledonary 

 and primal intemoae, the rudimen- 

 tary root of the embryo ; Eadi'onla 

 bysBOi'dea, the mycelium of Fun^ ; 

 radleoBe, radico'sxLs (Lat., having 

 many roots), having large or abun- 

 dant roots ; radic'nlar, pertaining to 

 the radicle ; radienliform'lB {forma, 

 shape), shaped like a radicle ; Badi- 

 cnlo'da, radicnlo'diuti,- the apex of 

 the radicle in gra8<»e8 ; radio Olose, 

 radiculo'sus, bearing rootlets. 



Ea'diosperms {radius, s^ke of a wheel; 

 (nripiMy a seed), certain fossil finiita, 

 circular in transverse section (F. W. 

 Oliver); cf. Platysperms, adj.radio- 

 sper'mio; radioBymmot'rlo, display- 

 ing symmetry from the centre, as 

 opposed to a bilateral symmetral. 



Ea'diuB, pi. Ea'dii (Lat., a ray), (1) 

 the ray of Compositae, the outer- 

 most florets when distinct in form 

 from those composing the disk; 

 (2) a partial umbel in Umbelli- 

 ferae ; (3) the structures known as 

 medullary rays ; <*' meduUa'rif = 

 Medullary Kay. 



Ra'dix, pi. Badi'cee (Lat., a root), 



319 



