244 | UMBELLIFER&, 
4. Angelica. Carpels with strong ribs, laterals forming a distinct dou- 
ble-winged margin to the fruit, oil-tubes one to several_in the inter- 
vals, 2-10 on the commissure. : 
5. Selinum. Carpels with prominent winged ribs, the lateral ones 
usually the broadest; oil-tubes conspicuous, 2-40n the commissure; seed 
sulcate beneath the oil-tubes. 
+ + Caulescent branching plants, with solitary oil-tubes, conical 
stylopodium, filiform or stronger dorsal and intermediate ribs and 
white flowers. 
6. Heracleum. Carpels with dorsal and intermediate ribs filiform; the 
broad lateral wings contiguous to those-of the other carpel, strongly 
neryed towards the outer margin. 
+ + + Short caulescent or acaulescent with solitary or numer- 
ous oil-tubes, no stylopodium, filiform dorsal and intermediate ribs. 
++ Lateral wings coherent till maturity. 
7. Pastrnaca Calyx-teeth obsolete: fruit oval, very much flattened, 
glabruus. 
8. Coloptera. Carpel with dorsal and intermediate ribs filiform or 
winged and approximate: lateral wings broad, very thick and corky: 
oil-tubes small, 4-8 in the intervals, 8-14 on the commissure 
9. Leptotenia. Carpel with dorsal and intermediate ribs filiform or 
obsolete, the lateral wings with thick corky margin that,is coherent 
with the margin of the opposite one till maturity: oil-tubes 3-6 in the 
intervals, 4-6 on the commisure. (Sometimes obsolete.) 
10. Peucedanum. Carpel with dorsal and intermediate ribs filiform 
approximate, lateral wings broad and thin: oil-tubes l-8 in the inter- 
vals, 2-10 on the commissure. 
++ ++ Carpels not coherent. 
11. Pseudocymopterus. Carpel with dorsal and intermediate ribs promi- 
nent and acute; lateral wings rather broad and thickish, oil-tubes 1-4 
in the intervals, 2-6 on the commissure, 
* * Fruit but slightly if at all flattened either way. 
+ Fruit with all the ribs conspicuously winged, stylopodium de- 
pressed or wanting. 
12. Cymopterus. Carpel somewhat flattened dorsally, with mostly 5 
broad thin equal wings, the lateral wings distinct. 
13. Phellopterus. Carpel somewhat flattened dorsally with 5 equal 
broad and corky-thickened wings, the wings distinct. 
14. Thaspium. Carpels with 3 or 4 or all the ribs strongly winged: sty- 
lopodium wanting. 
+ + Fruit with all the ribs prominent and equal acute or slightly 
winged stylopodium, conical oil-tubes numerous. ; 
15. Ligusticum. Oil-tubes 2-6 in the intervals, 6-10 on the commissure. 
+ +- + Fruit with broad and equal corky ribs, stylopodium de- 
pressed, oil-tubes solitary. 
16. Celopleurum. Carpel with very thick and prominent corky ribs. 
