(Umbels of more than 20 rays, with involucres of many bracts, and shortly 

 downy fruits 17. SESBLt 

 Umbels of few rays (seldom 10). Bracts few or none. Fruits burr-like or 

 very hispid . 11 



Fruit contracted at the top Into a very short, smooth beak 30. CIKSBOPHYT.I.UM. 

 Fruit covered to the top with hooked bristles .... 31. CAUCALIS. 



Fruit very much flattened 13 



Fruit globular, ovoid, or shortly oblong 18 



Fruit long and narrow, at least four times as long as broad. (Leaves much 



cut, and often hairy.) 48 



Fruit rough, surrounded by a thick edge 26. TOKDYLIUM. 



Fruit smooth, with a thin or double edge .14 



( Fruit bordered by 2 thin edges or wings, which are distinct before the fruit ripens. 

 14 \ (Tall plant, with numerous ovate segments to the leaves) . 22. ANGELICA. 

 ( Edges of the fruits single until the carpels separate 16 



13 



If, 



Leaves much dissected, with narrow or small segments . 23. PKUCEDANUM. 



", 



, . . . 



Leaves consisting of a few large, broad segments ...... 18 



Lower leaves of 3 large, 3-lobed segments, e<iual to each other, and with 

 stalks of equal length ....... 23. PKUCKDANUM. 



Lower leaves pinnate ; or, if ternale, the middle segment longer, with a 

 longerstalk . ........... 17 



Flowers yellow, all small ........ 24. PASTINACA. 



Flowers white, the outer petals of the umbels much larger . 25. UKKACLKUM. 

 1B i Flowers yellow ............. 19 



18 \ Flowers white .............. 22 



( Leaves two or three times ternate, with large broad segments. Fruit of 2 

 globular carpels ......... 35. SiUKNiUM. 



Leaves pinnate or much divided. Fruit ovoid or oblong ..... 20 



_ I Leaves very finely divided into liliform segments . . . 10. Fomici'LUM. 

 (Segments of the leaves flat, linear-lanceolate or oblong ..... 21 



I Kilts of the fruit very prominent, almost winged . . 19. Sli.Ai's. 



81 [ Ribs of the fruit scarcely prominent . . . .10. CAROM Petroseliiuun. 



Fertile flowers and fruits, at least the central ones, nearly sessile, sur- 

 rounded by small, barren, pedicellate flowers. Fruit corky, with calyx- 

 teeth ............ 14. (ENAMTHK 



Fertile flowers pedicellate ....... ... 23 



Leaves twice or thrice ternate, with large, broad segments (of 2 or 3 inches) . 24 

 Leaves once pinnate, with several pairs of essile, ovate, lanceolate, or dis- 

 sected segments ............ 28 



Leaves much dissected, with small or narrow segments, the lower ones 

 stalked .... .30 



2'.' 



24 



2I> 



Umbels all terminal and peduncled 



Umbels mostly lateral and sessile 6. APIDM. 



No involucres 9. jEooPODICM, 



Partial involucres of several bracts, general one of very few . 18. I.IUUSTICUM. 

 No involucres li I'utPiNKLLA. 



(Involucres at least to the partial umbels 27 

 Umbels terminal 28 

 Umbels mostly lateral, almost sessile . 29 



I Fruit ovoid, about 2 lines long or more 44 



28 < Fruit ovoid, under 2 lines long 11. Sir si. 



( Fruit nearly globular, not 1 line long ... ... 7. Siso.f. 



M I General involucre of several bracts 11. SIUM. 



1 No general involucre, or only a single bract 6. AriUK. 



a / Umbels mostly lateral, almost sessile 31 



I Umbels all terminal or pedunculate 32 



( Leaves with few ovate segments 6. APIUM. 



31 -' Leaves twice or thrice pinnate, with numerous small segments. 



( 10. (KNAMTUB Phellandrium. 



Erect branched annuals (not above 2 feet high) . ... 33 



Perennials or tall biennials 



32 



. . . 



Partial involucres longer than the flowers, and reflexed 

 Partial involucres shorter than the flowers, or noue . 

 Fruit globular or broader than long .... 

 Kruit ovoid or longer than broad .... 



15. JCTUUSA 



