OF NATURAL ORDERS OF BRITISH PLANTS. 183 



(Fruit compressed laterally B. 



( Fruit either rounded, or compressed dorsally N. 



(Calyx leafy, 5-toethed Cicuta. 



(Calyx obsolete or nearly so C. 



(Plants dioecious Trinia. 



(Plants hermaphrodite D. 



(Leaves simple, undivided Bupleurum. 



(Leaves compound, pinnate or divided E. 



p ( Fruit crowned with the persistent styles F. 



(Fruit not crowned with the styles H. 



(Styles straight Conopodium. 



(Styles reflexed G. 



-, ( Umbels without any involucre Pimpinella. 



' (Partial involucre present Slum. 



A. 

 15. 

 C. 

 D. 



F. 



H. 



( Fruit apparently single I. 



(Fruit apparently double M. 



T ( Rays of the umbel not exceeding 4 or 5 Sison. 



( Rays of the umbel numerous K. 



K. 



M. 



0. 



R. 



X. 



(Petals ovate, entire Helosciadium, 



(Petals inversely cordate, emarginate L. 



j ( Channels with single vittce ; leaflets linear Carum. 



( Channels without vittce ; leaflets ovate JEgopodium, 



(Involucra absent Apium. 



(Involucra present Petroselinum, 



N ( Fruit taper, or but slightly compressed O. 



" ( Fruit much compressed at the back X. 



(Ridges of the fruit prickly Daucus. 



(Ridges of the fruit not prickly P. 



p ( Fruit crowned with the persistent styles Q. 



( Fruit not crowned with the styles R. 



n ( Styles straight CEnanthe. 



u ' (Styles reflexed... Seseli. 



( Involucra both absent... Fceniculum. 



(Partial involucre present S. 



^ f Partial involucre 3-leaved, pendulous JEthusa. 



( Partial involucre many-leaved T. 



T ( Seeds unattached in the dried pericarp ; lvs. fleshy. Crithmum. 



' \ Seeds attached in the pericarp ; leaves not fleshy... U. 

 TJ ( Petals acute at both ends ; leaflets finely divided ...Meum. 



(Petals obovate, emarginate W. 



w f Leaflets nearly rhomboid, serrated ; flowers white... Ligusticum. 

 ' \ Leaflets linear, not serrated ; flowers yellowish Silaus. 



( Fruit flattened, with a thick knotted margin CC . 



( Fruit flattened, winged, wings not knotted Y. 



Y ( Fruit with a double wing on each side BB. 



' (Fruit dilated into a single wing on each side Z. 



y ( Ridges of fruit equi-distant, channels with 1-3 vittce. Peucedanum. 



' ( Two lateral ridges remote, channels with single vittce. AA. 



