Descriptive Botany 



A DICTIONARY 



Dialysis 



■when in a soft mucilaginous 

 condition, from the supposi- 

 tion that the sap passed in a 

 current upward in the wood to 

 the leaves, then downward be- 

 tween the wood and bark* See 

 Proper Juice. 



DESCRLP'TlVE b6tANY, see 

 Phytoqraphy. 



DESTRUCTIVE METAB'OlISM, 

 the chemical changes which 

 take place during the waste of 

 tissues. Compare Assimila- 

 tion. 



DESTRUCTIVE PAR'ASITE, one 

 which eauses the death of the 

 ' tissues of the host upon which 

 it feeds. 



DETERMINATE GROWTH, when 

 the season's growth ends in a 

 well-formed bud. 



DETERMINATE LNFLORES'- 

 CENCE, one in which the flow- 

 ering begins with a terminal 

 bud so that it puts a limit to 

 the elongation of* the stem; cen- 

 trifugal or definite inflores- 

 cence. 



DETERMINATION, the discov- 

 ery of the botanical name of a 

 plant, or of its position in a 

 system if unnamed; identifica- 

 tion. It implies some knowl- 

 edge of its characters acquired 

 by a more or less complete 

 analysis, and is frequently 

 completed by the aid of a 

 systematic key. 



DEU'TOPLASM, the portion of 

 the cell contents aside from 

 the protoplasm proper, con- 

 sisting of cell-siip in which 

 may be gran ides or other sub- 

 stances; paraplasm. Compare 

 Metaplasm. 



DfiX'TRdRSE, twining upward 

 from left to right, with the 

 sun or hands of a watch, as 

 the hop. Used in the opposite 

 sense, however, by most Eng- 



lish and American botanists. 

 Compare Sinistrose. 



DlAOHJE'NltJM, see Mericarp. 



DIACH'YMA (obs.), see Meso- 



FHYLLUM. 



DIADEL'PHIaN, see Diadel- 



PHOUS. 



DlADEL'PHOUS, having filaments 

 united by their edges in two 

 sets (one of which may be only 

 a single stamen), as in the pea. 



DIAGEOT'ROPISM, a kind of 

 geotropic irritability in certain 

 organs, as rootstocks, which 

 causes them to assume a hori- 

 zontal position; transverse geo- 

 tropism. 



DIAGNOSIS (pi. DIagno'ses), a 

 brief characteristic description 

 of a plant or species. 



DIAGn6s'TIc €HAR ACTER, see 

 Essential Character. 



DIAGONAL PLANES, the two 

 planes which bisect the right 

 angles between the median and 

 lateral planes. See Median 

 Plane and Lateral Plane 



DIAGONAL POSITION, a position 

 intermediate between the me- 

 dian and the lateral plane and 

 bisected by the diagonal plane. 



DIAGRAM, FLO'RAL, see Flo- 

 ral Diagram. 



DlAHELlOT'ROPlSM, the ten- 

 dency of organs to place their 

 surfaces at right angles to the 

 sun's rays, as most leaves; 

 transverse heliotropism. 



DlALYCAR POtJS, see Apocar- 

 pous. 



DlALYPET'ALOUS, see Poly- 



PETALOUS. 



DlALYPHYL'LOUS, see Polysep- 



ALOUS. 



DIAlYsEPALOUS, see Polysep- 



ALOUS. 



DlAL'YsIS, the separation of or- 

 gans usually joined; adesmy. 



54 



