STOERS AGRICULTURAL EXPERIMENT STATION. 



323 



irrespective of their size. Ijeaf-scars may lie le\-el witli tlic twig ni- 

 more ov less raised witii llieir siirfaees parallel with tlie twig or 

 making various angles with it up to a right angle. liidges in 

 some eases run down the twig irum the liase and eornei's of the 

 leaf-sear. 



At the hases of the lea\es of some speeies a pair of small leaflets 

 called sti]>ules are regularlv formed and leave, at the fall of the 

 leaf, more or less definite siipiih'-scdi's at eithei- side of the leaf- 

 scar as shown in the (,'arolina Poplar (fig. ."> ) . 



The numhcr. the size, the I'elation to the surface of 

 the leaf-Scar whether sunken or jirojeeting, and the 

 distribution of the hundle-scars form important points 

 of distirictinn. A\dien the\" are indistinct, as is fi'c- 

 ijUentK' the case, lliex' ma\' lie rex'caled if a thin slice 

 IS taken off the surl'ai'c of the leaf-scar. This surface 

 section must lie \"er\' thin. howe\"ei', since the aumlier 

 of luindle-scai's e.xposed li\' a dee]i cut is often ilitferent 

 from that on the sui'face. and this latter numher is the 

 one nseil in the ke\s and di'seri[itions. A distinction 

 , — SX is made hetween a group in which the linndle-scars 

 form a single line and a si'cond gi'oup in whieli they 

 are \-ariously seallci'ed and grou]UMl oi- in a 

 doulile line. 



Bl'DS — In regai'd to their ].)osition Iiuds are ter- 

 minal or lateral, finds produced at or near the nodes 

 Init not in the axil of a leaf-scar are called 

 urrrsxoni IniiJs. (ff these thei'e are two kinds: Sapcr- 

 pvsi'il hiids loeated ahove the axillary buds and 

 rolliitiTfil Iniils located at either side of the axillary 

 hmls. The foianer are shown in the Butternut (fig. li) 

 and the latter in tlie Ked :\raple (fig. i ) . Classified 

 according to what ihey produce tliei-e are f!i)iri'r hitil'; 

 i-iff. .s'^Twig of which contain the rudiments of flowers, li'nf Initio 

 caroiinapop- ^,.],j,.]j contain rudiinents of leaves, and jiiired &(/(/.< 

 sx-stipuie^^ which ]n-oduce liotli fiowers and leaves. Flower buds 

 p-^star-shaped ,^^.^ o-enerallv stoutei' than leaf buds. 



