360 COMPOSITION. [BOOK in. 



pass beyond the middle, and the parenchyma is not interrupted : 3. pinnati- 

 sectus, \yhen the lobes are divided down to the midrib, and the parenchyma 

 is interrupted: 4. pinnatilobat^ls, when the lobes are divided to an uncertain 

 depth ; lyrate and the like belong to this modification. He has similar 

 variations of palmatus and pedatus ; viz. palmatifidus, palmatipartitus, 

 palmatisectus, palmatilobatus ; and pedatifidus, pedatipartitus, pedatisectus, 

 and pedatilobatus. 



12. Comb-shaped (pectinatus); the same as pinnatifid ; but the segments very 

 numerous, close, and narrow, like the teeth of a comb ; as the leaf of 

 Lavandula dentata, all Mertensias. 



C. With respect to Composition or Ramification. 



1. Simple (simplex) ; scarcely divided or branched at all. 



2. Quite simple (simpliclssimus) ; not divided or branched at all. 



3. Compound (compositus) ; having various divisions or ramifications. As 

 compared with the two following, it applies to cases of leaves in which the 

 petiole is not divided ; as in the Orange. 



4. Decompound (decompositus) ; having various compound divisions or ramifica- 



tions. In leaves it is applied to those the petiole of which bears secondary 

 petioles ; as in the leaf of Mimosa purpurea. 



5. Supradecompound (supradecompositus) ; having various decompound 

 divisions or ramifications. In leaves it is applied to such as have the 

 primary petiole divided into secondary ones, and the secondary into a third 

 set ; as in the leaf of Daucus Carota. 



6. f Bifoliolate (f Hfoliolatus, binatus) ; when in leaves the common petiole is 



terminated by two leaflets growing from the same point ; as in Zygophyllum 

 Fabago. This term has the same application as unijugus and conjugatus. 

 We say trifoliolate, or ternate, when the petiole bears three leaflets from 

 the same point ; as in Menyanthes trifoliata : + quadrifoliolate, if there are 

 four from the same point ; as in Marsilea quadrifolia : and quinquefoliolate, 

 or quinate, if there are five from the same point ; as in Potentilla reptans. 



7. + Vertebrate (f vertebratus) ; when the leaf is contracted at intervals, there 



being an articulation at each contraction ; as in Cussonia spicata. Mirb. 



8. Pinnate (pinnatus) ; when simple leaflets are arranged on each side a 

 common petiole ; as in Polypodium vulgare. 



9. Pinnate with an odd one (impari-pinnatus') ; when the petiole is terminated 

 by a single leaflet or tendril ; as in Pyrus aucuparia. If there is a tendril, 

 as in the Pea, it is called cirrkose. 



10. Equally pinnate (pari-pinnatus, abrupte pinnatus) ; when the petiole is 

 terminated by neither leaflet nor tendril ; as Orobus tuberosus. 



1 1. f Alternately pinnate (f alternatim pinnatus); when the leaflets are alternate 

 upon a common petiole ; as in Potentilla rupestris. Mirb. 



12. Interruptedly pinnate (interrupte pinnatus) ; when the leaflets are alternately 



small and large ; as in the Potato. 



13. f Decreasingly pinnate (f decrescente pinnatus) when the leaflets diminish 



insensibly in size, from the base of the leaf to its apex, as in Vicia sepium. 



14. f Decursively pinnate (f decursive pinnatus) ; when the petiole is winged by 



the elongation of the base of the leaflets j as in Melianthus. Mirb. This 

 is hardly different from pinnatifid. 



