Bheine 



SUiome 



Ehe'ine, a proximate principle of the 

 officinal rhubarb, Rheum. 



rheotac'tic, adj. of Bheotax'is (rd^ts, 

 order), a synonym of Rheotropism. 



Eheot'ropism (p^.»>, I flow ; Tpow^, a' 

 turning), the phenomena in a grow- 

 ing organism produced by the influ- 

 ence of a current of water (Jonsson) ; 

 adj. rheotrop'ic. 



Ehepi'um, rf. IJefium. 



rliexigenet'ic (/iJjIis, a rending ; yevos, 

 offspring), the origin of tissues when 

 formed by mechanical rupture (De 

 Bary) ; also written rhexig'enous ; 

 rhexolyt'ic {\vTiKhs. able to loose), 

 when gemmae are detached by the 

 ruptuie of a cell and the disorganiza- 

 tion of its contents (Correns). 



Rhipid'ium (piTrls, (nir'iSos, a fan), a 

 fan -shaped cyme, the lateral branches 

 being developed alternately in two- 

 opposite directions. 



rhizamor'phoid, = iiHizoMOKPirors. 



rhizan'thous. -thus {piCa, a root ; &vOos, 

 a flower), root-flowered, flowering 

 from the root or seeming to do so ; 

 cf. iiADi^ALis : Rhi'zanths, plants 

 so characterized, Rhizogens ; rhiz- 

 auto'icous, in Mosses when the male 

 inflorescence is on a sliort branch, 

 cohering to the female by a rhizoid ; 

 Rhi'zel, Van Tieghem's term for the 

 "base" of the root, tliat is, the 

 I'oot apart from its radicles ; Rhiz- 

 id'ium, term suggested for Rhizoid 

 in the oophore condition (Rower) ; 

 Rhizi'na, ])1. Rhizi'nae, or Rhiz'- 

 ines, the root hairs of Mosses, etc., 

 Rhizoids ; Rhizinophyl'la or Rhiz- 

 ophyl'la. pi. {(pvWnv, a leaf), the 

 posticil brants of Hepaticae, which 

 bear the rhizoids (.'Spruce) ; Rhiz- 

 ioph'ysis + {<pva-is, a natural produc- 

 tion), an expansion of the radicle, 

 as in Nelumfiiiini ; Rhizo'bia {Bios, 

 life), the organisms which cause root- 

 tubercles in Leguminosae ; Rhizo- 

 blas'tus X {d\a(TThi, a bud), an em- 

 bryo which emits roots ; Rhi'zocarp 

 {Kap-rrhs, fruit), used of Marsileaceae, 

 which produce sporangia on root- 

 like processes ; rhizocar'pous, rhizp- 

 car'pic, -picus, (1) root-fruited, used 



by De Candolle to denote a per- 

 ennial herb ; (2) producing sub- 

 terranean flowers and fruit, in 

 addition to aerial, as Cynomelra 

 caulijiora, Linn., and Anmia rhiz- 

 antha, Eichl. (Huth) ; Rhizocolleiy 

 (/f(^A\Tj'js, a gluing), the union of the 

 axes of two individuals of the same 

 species solely by tlie roots (Morren) ; 

 Rhi'zocorm {+ Corm), J. Smith's 

 term for the fleshy rhizomes of Iris, 

 AcorxiH, etc. ; Rhizocton'ioae, disease 

 caused by the attack of Rhizoctonias 

 RMzocton'ia ( kt6vo r, murder), hyphae 

 twisted into strands like twine which 

 fasten on the roots of trees ; Rhizo- 

 der'mis {UpvLa, a skin), the outer- 

 most of the cortical layers (A. Meyer); 

 Rhi'zogen {y4vos, race, offspring), 

 (1) a plant which produces a root 

 and flower only, as Rafflesia ; (2) 

 parasitic on the roots of other 

 plants ; (3) any organ which' gives 

 rise to roots or rhizoids ; rhizoge- 

 net'io, rhizogen'ic, producing roots ; 

 ~ Cells, -~ Tis'sue, the mother-cells 

 of the peripheral la3'er of the central 

 cylinder which frequently give rise 

 to all the tissues of the rootlet; 

 Rhizog'enum. the dilated base of the 

 frond in some Algae, from which 

 proceed holdfasts (J. S. Ilenslow) ; 

 Rhi'zoid (el5os, resemblance), a hair, 

 frequently branched, serving as a 

 root in Mosses and Hepaticae, not 

 morphologically distinct from the 

 protonema, the same as Rhizine ; 

 rhi'zoid, rhizoid' ens, root-like ; rlii- 

 zoi'dal Cell, a small cell in the 

 antheridium of Isoetes (P>elajeflf) ; 

 rhizoma'tifonn [forma, shape), re- 

 sembling a rhizome in shape ; Rhi'- 

 zome. Rhizo'ma, pi. Rhizo'nmfa, 

 (1) the rootstock or dorsi ventral 

 stem, of root-like appearance, pros- 

 trate on or under ground, sending 

 off" rootlets, the apex progressively 

 sending up stems or leaves ; (2) = 

 Caudex (J. S. Henslow) ; (3) = 

 Radicle (Henslow) ; ~ Ge'ophytes, 

 perennial herbs with horizontal 

 underground shoots, which give rise 

 to leaves and flowers (Warming) ; 



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