608 AMMIACEAE 



2. Fruit flattened strongly dorsally, with the lateral ribs more or less prom- 

 inently winged. 

 a - Stylopodium wanting. 



Dorsal and intermediate ribs or some of them winged. 



Wings thickened and corky towards the margin; plants pseudo- 

 scapose from a thick deep-seated root. 



29. CYMOPTERUS. 

 Wings not thickened towards the margin. 



Leafy-stemmed plants with a taproot; calyx-teeth small and 

 equal; leaf-segments thin, not pungent. 



30. PSEUDOCYMOPTERUS. 



Acaulescent plants with a cespitose caudex; calyx-teeth large 

 and unequal, one or two much larger than the rest; leaf- 

 segments thick and pungent. 31. PSEUDOPTERYXIA. 

 Dorsal ribs filiform (or in one species of Cogswellia somewhat margined) . 

 Lateral wings thin, not corky; plants mostly small. 



32. COGSWELLIA. 



Lateral wings thick and corky; plants large. 



o 33. LEPTOAENIA. 



P. Stylopodium present. 

 Stylopodium depressed. 



Dorsal ribs more or less winged. 



Plant acaulescent or low-stemmed, with narrow leaf-segments; 



sepals evident; petals yellow. 34. CYNOMARATHRUM. 



Plant caulescent, with broad leaf-segments; sepals obsolete; 



petals white. 35. ANGELICA. 



Dorsal ribs filiform; plant caulescent; sepals obsolete; petals yellow. 



36. PASTINACA. 

 Stylopodium conical. 



Plants villous at least in the inflorescence; sepals obsolete. 



Leaves ternate, with rounded-cordate leaflets; oil-tubes prom- 

 inent, inversely clavate, only in the upper half of the carpels. 



37. HERACLEUM. 

 Leaves once or twice pinnate; oil -tubes not prominent, running^ 



through the whole length of the carpels. 



38. SPHENOSCIADIUM. 

 Plants glabrous, with linear or lanceolate leaf-segments. 



Sepals obsolete; leaves in ours three or four times compound; 

 oil-tubes several in the lateral intervals. 



39. CONIOSELINUM. 



Sepals evident; leaves in our species simply pinnate; oil-tubes 

 solitary in all intervals. 40. OXYPOLIS. 



1. DAUCUS (Tourn.) L. CARROT. 



Bristly annuals or biennials. Leaves pinnately decompound. Flowers white 

 or rarely pinkish, in compound umbels. Bracts foliaceous and pinnately cleft; 

 bractlets entire or toothed. Calyx- teeth obsolete. Fruit oblong, flattened dor- 

 sally. Primary ribs 5, slender, bristly; secondary ribs 4, strong, each bearing 

 a row of strong, barbed prickles. Stylopodium depressed or wanting. Oil-tubes 

 solitary under the secondary ribs, 2 on the commissure. Seeds flattened dorsally; 

 face more or less concave. 



1. D. pusillus Michx. Annual; stem repeatedly pinnately dissected into 

 short linear divisions; bracts bip innate, with linear divisions; bractlets linear- 

 filiform; fruit ovoid-oblong, 3-5 mm. long. Dry or sandy soil and waste places: 

 S.C.Fla. Calif. B.C. Ida. Son. Mr-Au. 



2. CAUCALIS L. 



Mostly hispid annuals (ours). Leaves pinnately dissected. Flowers white* 

 in umbels.' Bracts in ours foliaceous, divided; bractlets entire or toothed- 

 Calyx-teeth prominent. Stylopodium thick and conic; fruit ovate or oblong, 

 flattened laterally; primary ribs 5, filiform, 2 of them pushed down on the com- 

 missural side, the other 3 bristly; secondary ribs 4, winged and with barbed or 

 hooked prickles. Oil-tubes solitary under the secondary ribs, and 2 on the com- 

 missural side. Seed-face deeply grooved. 



1. C. microcarpa Hook. & Arn. Slender annual; stem 2-4 dm. high, gla- 

 brous or sparingly hispid; leaves repeatedly pinnatifid into numerous linear 

 divisions, glabrous or sparingly hairy; bracts foliaceous, pinnatifid; bractlets 

 small, usually entire; fruit oblong, 4-6 mm. long, armed with rows of hooked 

 prickles. Hills and river-banks: Wash. Ida. Ariz. Calif. Son. Mr-Je. 



