Twilling 



A DICTIONARY 



TJmbonate 



TWiN, see Geminate. 



TWIN'LNG, ascending by coiling 

 the stem in a spiral manner 

 around a support; voluble. 

 Compare Climbing. 



TWlST'ED, see Contorted. 



TWO -CLEFT, see Bifid. 



TWO' -FORKED, see Dichoto- 



MOU8. 



TWO -LLPPED, see Labiate. 



TWO-PARTED, see Bipartite. 



TWO/RANKED, situated in two 

 vertical rows on opposite sides 

 of the stem, as the leaves of 

 grasses; distichous. 



TWO'-TOOTHED, see Bidentate. 



TY'LOSE, see Tylosis. 



TYLO'SiS (pi. Tylo'se§), a pro- 

 trusion from an adjoining cell 

 into the cavity of a vessel, 

 sometimes exhibiting repeated 

 cell-division within the vessel. 

 Sometimes written Thylose 

 and Thyll. A vessel which 

 contains these protrusions is 

 said to exhibit tylosis. 



TYM'PANu*M, a membrane clos- 

 ing the mouth of the capsule 

 in some mosses. 



TYPE, a perfect specimen or in- 

 dividual, exemplifying the es- 

 sential characters of the species 

 or other group to which it 

 belongs. 



TYPE-SPEg'IMEN, the original 

 specimen from which a botan- 

 ical description was written 

 and upon which the name of 

 the plant or group is based : 

 the actual individual which 

 serves as the type of a species 

 or other group. 



TYP'ICAL, representing the type 

 or plan. 



tJLlG'fNOSE, see Palustrine. 

 ULl6'lN0US, see Palustrine. 



UM BEL, the inflorescence of the 

 order Umbelliferoe, or any 

 flower - cluster in which sev- 

 eral primary rays or pedicels 

 arise from the apex of the 

 stem or peduncle. A typical 

 umbel is somewhat flat-topped, 

 and has the rays spreading like 

 the stays of an umbrella. An 

 umbel is simple when each ray 

 or pedicel bears but a single 

 flower; it is compound when 

 each bears several flowers or 

 secondary rays. 



tJM'BEL, CY'MOSE, see Cymose 

 Umbel.* 



UM'BELLATE, bearing umbels; 

 pertaining to umbels; umbel- 

 like. 



UM'BELLATE CYME, see Cymose 

 Umbel. 



tJM'BELLET, a small umbel or a 

 partial umbel; umbellule. 



tJMBELLiF'EROUS, producing 

 umbels. 



u*MBEL'LlF6RM, in the shape of 

 an umbel. 



tJMBEL LULATE, in the form of 

 a small or a partial umbel. For- 

 merly used for Subumbellate, 

 which see. 



UM'BELLtJLE, see Umbellet. 



tJMBELLtJLlF'EROIJS, bearing 

 small umbels. 



UMBtL'iCAL CORD, see Funicu- 

 lus. 



tJMBlL'IcATE, having an umbili- 

 cus, or central depression like 

 the navel. 



u-MBiLl'CtjS, an old term for 

 Hilum; any depression resem- 

 bling the navel. 



tJM'BO, a central elevation, like 

 the boss of an ancient buckler. 



tfM'BONATE, having a low, 

 rounded central projection, 

 as the cap of many mush- 

 rooms. 



192 



