SYNOPSIS OF THE GENERA. 



51. Petroseli'num, [Page 356.] Calyx limb obsolete. Petals 



roundish, entire, slightly emarginate, with a narrow in- 

 curved point. Fruit ovate, laterally contracted, nearly 

 double. Carpels with five filiform equal ridges, the two 

 lateral ones forming the margin. Channels with single 

 vitta. Albumen very convex at the back, plane in front. 

 General involucre of a {eWy partial of many, segments. 



52. Tri'nia, [Page 358.] Calyx limb an obsolete margin. 



Petals of the barren plant lanceolate, with a narrow in- 

 flexed point, those of the fertile ovate, with a short inflexed 

 point. Fruit ovate, laterally compressed. Carpels with 

 five prominent filiform equal ridges, the two lateral ones 

 forming the margins. Channels with obscure vittcB, but 

 a distinct channel under each ridge. Albumen very con- 

 vex at the back, plane in front. Involucre various. 



53. Heloscia'dium, [Page 359.] Calyx limb of five teeth, or 



obsolete. Petals ovate, entire, with a straight or inflexed 

 point. Fruit ovate, or oblong, laterally compressed. 

 Carpels with five filiform prominent equal ridges, the 

 lateral ones forming the margins. Channels with single 

 vittcB. Albumen convex at the back, plane in front. In- 

 volucre various. 

 b. Petals obcordate, with a small injlexed point. Calyx 

 obsolete. 



54. Si'sON, [Page 362 .] Calyx margin obsolete. Petals round- 



ish, deeply notched and incurved with an inflexed point. 

 Fruit ovate, laterally compressed. Carpels with five 

 filiform equal ridges, the lateral ones forming the margins. 

 Channels with short single club-shaped vittce. Albumen 

 convex at the back, plane in front. General and partial 

 involucre of few segments. 



55. vEgopo'dium, [Page 363.] Calyx margin obsolete. Petals 



obovate, notched and curved with an inflexed point. 

 Fruit oblong, laterally compressed. Carpels with five 

 filifonn ridges, the lateral ones forming the margins. 

 Channels without vittcc. Albumen roundish, convex, 

 somewhat plane in front. General and partial involucre 

 wanting. 



56. Ca'rum, [Page 364.] Calyx margin obsolete. Petals obo- 



vate, notched and curved with an inflexed point. Frtiit 

 oblong, laterally compressed. Carpels with five filiform 

 ridges, the lateral ones forming the margin. Channels 



