ON THE NATURE OF STIPULES 215 



one for the leaf. This supports the view that the 

 tendril corresponds to a stipule. 



The tendrils of Smilax will be referred to under the 

 next heading. 



Monocotyledons 



There has been much difference of opinion as to 

 whether Monocotyledons have stipules. De Candolle 

 stated without any hesitation or qualification that ' Les 

 stipules n'existent dans aucune plante monocotyledone.' 

 Others, however, have been of a different opinion. The 

 tendrils of Smilax and the ligule of Graminece have 

 been regarded by many botanists as true stipules. 



The tendrils of Smilax arise in the same manner as 

 stipules, being lateral outgrowths of the base of the 

 young leaf. They must, I think, be regarded as stip- 

 ules, though it will be seen from the subjoined note l 



1 The tendrils of Smilax have been considered as representing 

 two lateral leaflets of a compound leaf by Von Mohl ( Ueber den Bau 

 mid das Wuulcn der Ranken und Schlingpflanzen, 41, 1827) ; Lind- 

 ley (LUrod. to Botany, Ed. 2, 118, 1835) ; Link (EUm. Phil. Bot. 

 Ed. 2, i. 478, 1837) ; St. Hilaire (Legons de Bot. 170 and 854, 1840) ; 

 Le Maout (Atlas de Bot. 23, 1846), and Duchartre (Art. ' Vrille ' in 

 Diet. Vniv. Hist. Nat.). 



Mirbel (EUm. de Physiol, et de Bot. ii. 680, 1815) ; Treviranus 

 (Physiol, der Gewachse, ii. 138, 1838) ; Seringe (EUm. de Bot. 175, 

 1841) ; De Candolle (Thdorie EUment. Ed. 3, 321, 1844) ; Trecul 

 (Ann. Sci. Nat. ser. 3, xx. 295, 1854), and Lestiboudois (Ball. Soc. Bot. 

 Fr. iv. 745, 1857), believe these organs to be stipular. It is the 

 opinion of Clos that they are neither leaflets nor stipules, but a 

 double lateral prolongation of the cellulo-vascular elements of the 

 petiole. Colomb (19, 33) regards the tendril of Smilax as a demi- 

 ligule. 



