Diamesogamous OF BOTANICAL TERMS. 



Diffract 



When applied to parts of a 

 flower it refers to the separa- 

 tion of organs of the same 

 whorl from each other, as 

 when a normally gamopeta- 

 lous corolla has its petals dis- 

 tinct. Compare Solution. 



DlAMES6G'AM0US, fertilized hy 

 the aid of some external agent, 

 as wind, water, or insects. 



DlAN'DRIAN, see Diandrous. 



DiAN'DROUS, having two sta- 

 mens. 



DIAPHANOUS, transparent, or 

 nearly so. 



DIAPHRAGM, any dividing 

 membrane or partition; sep- 

 tum. The term is usually 

 applied to the septum at the 

 node of a hollow-stemmed 

 grass. 



DiAP'HYSiS, an old term for the 

 proliferation of a flower. 



Dl'ASTASE, a ferment generated 

 in germinating seeds, etc., 

 which assists in the transfor- 

 mation of starch into sugar. 



DlAs'TER, see D vaster. 



DlAT'OMINE, see Phycoxan- 



THINE. 



DlCAR'PELLARY, of two carpels; 

 digynous. 



DiCHA'SIUM (pi. Dlcha'sla), a 

 false dichotomy in which two 

 lateral shoots of nearly equal 

 strength arise beneath the apex 

 which bears a flower; bipa- 

 rous, dichotomous, or forked 

 cyme. Compare Compound 

 Dichasium. 



DIOHAs'TIC, spontaneously di- 

 viding. 



DKHLAMYD'EOUS, having both 

 calyx and corolla. 



DICHdG'AMOUS, having flowers 

 in which the stamens and pis- 

 tils mature at different times; 

 either protandrous or protogy- 

 nous. Compare Synacmic. 



Dl€H6T'0MAL FLOWER, one 



seated in the fork of a dicha- 

 sium. 



DICHOTOMIZE, to fork. 



DlCHdT'OMOtlS, forked; furcate; 

 bifurcate. 



DlCHdT'OMY, forking into two 

 branches of the same nature 

 and usually of about the same 

 size. True dichotomy is caused 

 by the cessation of the previous 

 increase in length of a member 

 at the apex, and its continuance 

 in two diverging directions 

 from two newly constituted 

 apices. Compare Helicoid 

 and Scorpioid Dichotomy. 



DiCLE'SIUM, a name formerly 

 applied to an achenium having 

 an adhereut calyx, as in Mirab- 

 ilis. 



DIC'LiNdUS, having the stamens 

 and pistils in separate blossoms 

 — either monoecious or dioe- 

 cious; separated; digamous; 

 unisexual. 



DlCdCCOUS, having an ovary 

 consisting of two closed car- 

 pels or cocci with one seed in 

 each, as in the Umbelliferae. 



DICQE'LOtJS, having two cavities. 



DIC6TYLED'6NOtJS, having two 

 cotyledons. 



DID'YMOUS, in pairs. 

 DIDYNA'MIAN, see Didyna- 



MOUS. 



DIDYNAMOUS, having two long 

 and two short stamens. Com- 

 pare Tetradynamous. 



DIE'CIOUS, see Dicscious. 



DIFFLUENT, readily dissolving. 

 Compare Deliquescent. 



DIFFdRMED', of unusual shape. 



DIFFRACT', said of a lichen 

 thallus which is broken into 

 areolae separated by clefts or 

 chinks. 



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