608 AMMIACEAE 



2. Fruit flattened strongly dorsalIy» with the lateral ribs more or less prom- 

 inently Avinged. 

 ^' Stylopodium wanting. 



Dorsal and intermediate ribs or some of them winged. 



Wings tliickened 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. PSEUDOCYMOPl£RUS. 



Acaiilescent plants with a cespitose caudex; cal>x-teeth large 

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

 segments thick and pungent. 31. PsErnopxERYXTA. 

 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. 



R r. . .. 33. Leptoaenia. 



P' Stylopodium present. 



Stylopodium depressed. 



Dorsal ribs more or less winged. 



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



sepals evident; petals yellow. 34, Cyxoaiarathrum. 



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 upj)er half of the carpels. 



37. Heracleum. 

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

 through the whole length of the carpels. 



^ 38. SPHENOSClADItXM. 



Plants glabrous, with linear or lanceolate leaf-segments. 



Sepals obsolete; leaves in ours three or foui- times compound; 

 oil-tubes several in the lateral intervals. 



39. CONIOSELINLTM. 



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

 solitary in all intervals. 40. Oxypolis. 



1. DAUCUS CToiu-n.) 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 secondar>' 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 bipinnate, with hnear divisions; bractlets linear- 

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

 S.C.— Fla.— CaUf.— 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. Stylopodiima thick and conic; fruit ovate or oblong, 

 flattened laterally; primary ribs 5, fihform, 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 

 pnckles. Hills and river-banks: Wash.— Ida.— Ariz.— Calif. Son. Mr-Je, 



