246 UMBELLIFERJ5. DAUCUS. 



30. Sium. Calyx-lobes minute carpels with prominent corky nearly 

 equal ribs ; seed subangular. 



b. Oil-tubes solitary in all the intervals. 



31. Apinm. Calyx-lobes obsolete; fruit ovate or broader than long: oil- 

 tubes '2 on the commissure. 



c. Ribs filiform. ^ 



32. Zizia. Calyx-lobes prominent ; stylopodium wanting ; seed terete 

 sulcate beneath the oil-tubes. 



= = = == Fruit with plane seed-face conical stylopodium and 

 solitary oil-tubes. 



33. Carum. Calyx-lobes small, carpels with filiform or inconspicuous 

 ribs seeds dorsally flattened. 



34. Taeniopleurum. Calyx-lobes prominent carpel with broad salient 

 ribs. 



35. Cicuta. Calyx-lobes rather prominent carpels with strong flattish 

 corky ribs, the lateral ones the largest. 



= = = = = Fruit with plane seed -face conical stylopodium and 

 numerous oil- tubes 



36. Beriila Calyx-lobes minute; carpel nearly globose with very slender 

 ribs thick corky pericarp and terete seeds. 



-M. ^ .M. Carpels strongly flattened laterally stylopodium de- 

 pressed. 



37. Hydrocotyle. Caylx-lobes minute or none carpel with 5 primary ribs 

 and filiform intermediate ones. 



/. Fruit with secondary ribs the most prominent or the only 

 ones: oil tubes beneath the secondary ribs or wanting. 



1 DAUCUS Tourn. L. Gen. n. 333. 



Bristly annual or biennial herbs with pinnately decompound 

 leaves foliaceous and cleft involucral bracts, entire or toothed 

 involucels and white flowers in concave umbels. Calyx-lobes 

 obsolete. Fruit oblong flattened dorsally. Carpel with 5 slen- 

 der bristly primary ribs and 4 winged secondary ones, each 

 bearing a single row of prominent barbed prickles. Stylopodi- 

 um depressed or wanting. Oil-tube solitary in the intervals, 2 

 on the commissure. Seed-face concave or almost plane. 



D. pusillus Michx. Fl. i, 164. Stems retrorsely papillate-hispid, 

 from an inch to 2 feet high : leaves finely dissected into narrowly linear- 

 segments : umbels unequally few to many-rayed; rays 6-18 lines long; 

 pedicels very unequal. 1-8 lines long. On dry rocky or sterile ground, 

 Brit. Columbia to California and across the continent. 



D. CAROTA L. 'THE CULTIVATED CARROT.) Stems bristly 1-4 feet high; 

 leaves rather coarsely divided, the ultimate segments lanceolate and cus- 

 pidate, umbels with numerous elongated rays and prominent involucels. 

 Escaped from gardens and extensively naturalized. 



