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LEA 



A two-edged Leaf {Anceps) is one which has twopro- 

 minert angles, running lengthways on a convex difk. 

 A three-cornered Leaf [Xriq^iietrmn) has three longitu- 

 dinal plain fides like an awl-fhaped Leaf. 

 A three-edged Lt^Tif [Trigonal) is much like the former, 

 but in this^ the ribs are fnarp and membranaceous, 

 the furface of the Leaf being channelled. When a 

 Leaf has four or five angles, it is called tetragonal 



and Dcnragonal, &c. 



A furrowed Leaf {Sulcatum) is one that has feveral 



ridges running lengthways, which have obtufe finufus, 



fig. ^9. 



A keel&aped Leaf {Carinatum) is one that has the 



under part of the difli prominent th^ whole length, 

 nd the upper concave like the keel of a boat. 

 A membranaceous 'Lt^i {Membranaceum) is one wholly 

 compofed of membranes, v/ithout any apparent pulp 



between. 



z^i {Compofitmi) in general means one, 



which is formed of feveral fmall Leaves Handing upon 

 one foot-ftalk, but thefe Leaves are divifible again to 

 the Itrudure and pofition of the fmall Leaves. 

 I ft. Into fuch as are properly and diftinftly called 

 compound Leaves ; 2dly, the decompound ; sdly, the 

 fupradecompound, of each of thefe in its place. 

 In defcribing thefe kinds of Leaves, the whole Leaf 

 which is the refult of the combination, is confidered 



s one Leaf, called {Folium) and the fmall leaves which 



E A 



+ 



A double-winged l^^z^ {Bipinnatum) is one wj-^ofe foo^ 

 ftalk is divided, and thefe divilions have fnuU Leav- 

 ranged on their fide like wings, i;g. 71, ^^ 



A foot-fiiaped or branched Leaf {Pcd.Uum) is one 

 v/hofe foot-ilalk is divided, and has fomc fmall Leave.^ 

 placed on the inner fide, as in Paffiflora and Arum 



/2. 



hg. 



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together compofe it {Fclioli) or lobes 



A fimple compound Leaf, is one whofe fimple foot- 



. .. ftalk bears more than one Leaf. 



'""A jointed one {Articulatum) is when one Leaf grows 

 out of the point of another, fig. 60. 

 A fingered Leaf {Digitatum) is one which is compofed 

 of feveral fmall Leaves joining to one foot-ftalk at 

 their bafe, fpreading open like the fingers of a hand, 



fig* 6r. , . ..- ..-:•:;:-'> ;j- I' '-KiM 



A two-lobed Leaf {Binatum) is one with two fmall 

 Leaves on one foot-ftalk, fig. 6%.' 



' — - --Jf- 



,, - .^_^^- - 





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A three-lobed Leaf {T'ernatum) is one with three fmall 



A greater compounded Leaf {Supra decompofjw.n) is 

 one whofe foot-ftalk is many times divided, and'c--' 

 divifion is garniftied with fmall Leaves. 

 A tritcrnate Leaf {Triternatum) is one whofe foot-ftalk 

 connefts three double trifoliate Leaves. 

 A triple-winged Leaf {Tripinnatum) is one com-ofej 

 of feveral double-winged Leaves j if th.efe are termi- 

 nated by two fmall Leaves, they are faid to be abrupt' 

 fig. 73. but when they are tr;rminated by an odd one* 

 they are calledan irregular, triple, wingedLeaf, fia 7/ 

 We next come to confider the diftinftions of Leaves 

 from their place, pofition, infertion, or their direction" 

 when joined to the other parts of plants. * 



A feed Leaf {Semhmk) is the firft Leaf of the plant 

 and is what former writers called cotyledonesi thefe 

 are different in form and fubftance from the' oth 

 Leaves, fig. 75. 



A bottom Leaf {Radicate) is one whofe foot-ftalk rifes 

 immicdiately from the root. 



An upper or ftalk Leaf {Caulinum] is one which sro\ 

 from the ftalk of the plant, fig. y6. 



An axillary Leaf {Axillare) is one which grows from 

 the infertions of the branches, fig. jj, 

 A flower Leaf {Florale) is one that is inferted near 

 the flower, and never appears but with it, fig, 78. 

 A ftarry Leaf {Stellate) fig. j^. or whorled Leaf {Ver- 

 ticillata) is when feveral Leaves are difpofcd in whorls 

 round the ftalk, fig. 80. ; . 



Oppofite Leaves {Oppofita) are when thofe upon the 

 ...ftalks ftand by pairs on each fide, fig. 81. 

 Alternate^Leaves {Alierna) are when they ftand alter-, 

 nate above eacli other, fig. 82. - ^i 



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A cinqucfoil Leaf (^/»^//^w) has five fmall LeAves 

 on the fame foot-ftalk. ^,:,v > , • ' . 



Ceaf {Pinnaium) is one which has many 



^; finall LeavesV'VVnged on each fide a fingle foot-ftalk 



* "like wiriffs ; of thefe there are feveral kinds, , .. .;,., 



,:. An unequal winged 'Ltaf (^Pinnaium cum im^are) is a 



winged Leaf, ternriinateS 1by an odd lobe or {FolioU) 



A clafpeV-winged^Leaf {Pinnatum cum cirrho) is a 



over the whole plant. . . diiv/.^r.: - 



Clufter Leaves {Conferta) are fuch as come out from 

 the fide of the branches in clufters, and are fo clofe 

 to one another, that it is not eafy to difcover their ex- 

 aA fituation, fig, 83. - 



Imbricated Leaves {Imlricata) are fuch as are placed 

 over each other like tiles On a houfe, or the fcales of 

 fifties, fig. 84. \ 



Bifiich 



{Fafciculata) 

 le point, fig 



* * 



L' 



: -winged Leaf ending with a tendril or clafper, fig. 6^, upon two fides of the branches, as in the Fir-tree. :' 

 v,^ An abrupt-winged Leaf {Ahruptum) is a winged Leaf A target or ihield-fliaped Leaf (Peltatum) is one whofe 



not terminated by an odd lobe or clalper, hg. 00. 

 v-An oppofite-winged Leaf {Oppofite pinnatum) is when 

 ' tlie fmall Leaves or lobes are placed oppofite or^ the 

 -, rnidrib. '■/■ t^-'j-.j . ^..- -: 



-. An alternate-winged J 



. when the fmall Leaves ftand alternate; 



foot-ftalk is fixed to the difk, and not to the bafe or 

 edge of the Leaf, fig. 86. - ' w.'^^x^^ 



Petiolatum is when the foot-ftalk is inferted to the 



-\ v;^_. * ^ r-^-^ 



.:.^-:-:hiS 





' t^ 4 





• ■ 



bafe of the margin, fig. 87. 

 ; -Seffilejs when the Leaf fits clofe to the ftalk or branch, 

 -. - .^-^ ,-'' and has no foot-ftalk, fio-. 88. ■' ■. -*'t->^ -^rhnc-^ 



; An interrupted-winged l^t^tj^lnterrupteptnnatum) is I A running "Leaf {Decurrcns) is when the Leaf adheres 

 „ "when there are fmaller lobes ihterthixed. with larger /to the ftalk or branch, and is extended alono; the ftalk 

 -.-.-^i*. 1.^^ r.-i „.j„u c^ ^«-:--i . -; _' v.- from the bafe, fo as to form a leafy border on each 



.^;n3p6n the fanjp^^ipidnb, ^fig 





A iointcd-vvine:ed Leaf {Articulate pinnatum) is when 

 ^. the common foot-ftalk is jointed, fig. 68. 



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1- ' 



A Vunning-winged Leif (I)fr^?^'i;^ ^/;/W/^^^ is one 

 r whofe finall Leaves run alone;' tne foot-ftalk from one 

 •>tto another, fig. og-H^ '" '"^ * ^ ;.. ■ 



If ^.f----. p4 r t*i^'/n-*i^'* >^ •^^ ' * 



.^- .svo!j* 



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A conjugated Leaf {Conjugatum) is one^which has but 



, :^4ide th?,ftalk, fig. 89, \ . , _ 



is when th^ bafe of the Leaf environs 

 or ernpraces the fides of the ftalk entirely, fig. 901 

 .ySemtamplexica'uIe, is" when the bafe of the Leaf reach 



^.but half rounB the ftalk.rrWc^:^:t^--?>i v-^!^!:- '/. :•:!'- *^ 



^foliatum) 





a'twoYmall Leaves on the fame fpot-ftall<:."-|";t:^.-f// ■: r ior§t?d by the ftalk or branch,, which do not touch 

 "^ijWe next proceed to the deconij)ou: 



.^w?^ decompounded Leaf {Decomp'ojit 



'fGot-fl:alk is once divided, and joi: 

 Vi- fmall Leaves. 

 ;^^;A'double conjugated Leaf {Bigemtnatum) is one whofe 



.foot-ftallc" divides in forks, and conncfts four fmall 



Leaves dn the top, or it is compofed of two conju- 



s -p.- 



'-^^_ 



\- 



' - i. ^ * 



--thejnargin, fig. gi7^ ,^ _ „ . 

 Connatum, is when the two oppofite Leaves cohere 

 at their bafe, {6 as to Form one body embracing the 



■**' 



flalk, fig. 61, ::^r -."lo 



'VS 



'•-'-.••■ If 5 r = 



nations. 



A doutle trifoliate Leaf {Biternatum) is one whofe 

 foot-ftalk is divide3,^ and each divifion fuftains three 

 fmall Leaves, fig. 70.4 -'-1^ .' 



J-^^^^/^g;;/, is whgn . the bafe of the Leaf forms a kind 

 of cylinder, ' embracing the ftalk like a ftieath, as in 

 Corn, Grafs, fig. 93. 



The dircdtion of Leaves. 

 . An adverfe 'Lezf {Adverfum) is one v/hofe fides refped 

 the meridian and not the heavens, as the Ginger, &c. 





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