SYNOPSIS OF THE GENERA. 



ones equi-distant, the lateral ones remote, contiguous to 

 the thickened margin, or sometimes covered over by it. 

 Channels with one to three vittcB. Albumen flattened. 

 General and partial involucre of numerous segments. 



b. Ridges slender, equi-distant. 



75. Peuce'danum, [Page 394.] Calyx margin of five teeth, 



sometimes obsolete. Petals obovate, emarginate, or en- 

 tire, with an inflexed point. Fruit flattened at- the back, 

 with a broad thin margin. Carpels with five nearly equi- 

 distant ridges, the three dorsal ones filiform, the lateral 

 ones more obsolete, contiguous to or confounded with the 

 dilated margin. Channels with one to three vitice. AI-- 

 bumen flat in front. Pericarp double. General involucre 

 various, partial of numerous segments. 



76. Impe'ratoria, [Page 396.] Calyx margin obsolete; (the 



rest as in Peucedanum.) 



4. Fruit more or less compressed at the back, with five primary 



and four secondary ridges, prickly. 



77. Dau'cus, [Page 397.] Ca/ya; of five teeth. Pe^a^s obcordate, 



with an inflexed point, the outer ones radiant, bifid. 

 Fruit compressed at the back. Carpels with five primary 

 filiform bristly ridges, three at the back, the two lateral 

 ones on the plane of the commissure, the four secondary 

 ones more prominent than the rest, and with a single row 

 of prickles. Channels under the secondary ridges, with 

 single vitlcB. Albumen flat in front. General and partial 

 involucre of numerous segments. 



5. Fruit with the margins of the albumen rolled inwards, or 



deeply channeled in front. 



a. Fruit prickly. 



78. Cau'calis, [Page 399.] Calyx of five teeth. Petals ob- 



cordate, with an inflexed point, the outer ones radiant, and 

 deeply bifid. Fruit slightly compressed on the sides. 

 Carpels with five primary filiform, bristly or prickly 

 ridges, three at the back, the two lateral ones on the plane 

 of the commissure, and the four secondary ridges more 

 prominent, with one or two rows of prickles. Channels 

 under the secondary ridges, with single vitta. Albumen 

 deeply channeled in front. General and partial involucre 

 variable. 



79. Tori'lis, [Page 401.] Calyx of five teeth. Petals obcor- 



