246 UMBELLIFER2., DAUCUS. 
30. Sium. Calyx-lobes minute carpels with prominent corky nearly 
equal ribs; seed subangular. _ 
b. Oil-tubes solitary in all the intervals. 
81. Apium. 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 
suleate beneath the oil-tubes. : 
= = = = Fruit with plane seed-face conical stylopodium and 
solitary oil-tubes. ’ 
38. Carum. Calyx-lobes small, carpels with filiform or inconspicuous 
_ ribs seeds dorsally flattened. 
34. TeBIPCRKER? 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. Berula Calyx-lobes minute; carpel nearly globose with very: slender 
ribs thick corky pericarp and terete seeds. 
++ 4+ + Carpels strongly flattened laterally stylopodium de- 
pressed. 
37. Hydrocotyle. Caylx-lobes minute or none carpel with 5 primary ribs 
and filiform intermediate ones. 
I. 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 
involuecels and white flowers in coneave 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; 
pone very unequal. 1-8 lines long. On dry rocky or sterile ground, 
rit. Columbia to California and across the continent. 
PD. Carora L, (THE CULTIVATED CARROT.) Stems bristly 1-4 feet high; 
leaves rather coarsely divided, the ultimate segments lanceolate and cus- 
idate, umbels with numerous elongated rays and prominent involucels. 
Fpaued from gardens and extensively naturalized. 
