168 



AMMIACEAE 



Lateral wings thick and corky; plants large. 



33. Leptoaenia. 

 Stylopodiuru present. 

 Stylopodium depressed. 



Dorsal ribs more or less winged. 



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



sepals evident; petals yellow. 34. Ctnomahathrum. 



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. Hbraclecm. 

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



through the whole length of the carpels. 



38. SPHENOSCIADItTM. 



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. CONIOSELINtJM. 

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



soUtary in all intervals. 40. Oxypolis. 



1. DAUCUS (Tourn.) L. Carrot. 



2. CAtJCALIS L. 



1. D. pusillus. 

 1. C. tnicrocarpa. 



3. ERYNGIUM (Tourn.) L. Rattlesnake-Master, Ertngo. 



1. E. articulaium. 



4. SANICULA (Tourn.) L. Snake-root, Sanicle. 

 Leaves palmately or pedately 3-7-divided. 



Styles longer than the bristles; staminate flowers often in separate umbels. 



1. S. marilandica. 

 Styles shorter than the bristles; staminate flowers always intermixed with the fertile 

 ones. , 2. S. canadensis. 



Leaves pinnately twice or thrice ternate. 3. S. sepientrionalis. 



5. OSMORRHIZA Raf. Sweet Cicely. 



1. O. longistylis. 



2. O. obtusa. 



Involucels of several bractlets. 

 Involucels lacking or of a single small bractlet. 

 Fruit obtuse at the apex, without a neck. 

 Fruit more or less constricted at the apex into a short neck. 

 Pedicels longer than the fruit. 



Stylopodium short, broad and flat, making the fruit almost truncate at the 

 apex; plants almost glabrous. 

 Corolla piu'ple. 3. O. purpurea. 



Corolla white. 4. O. Leibergii. 



Stylopodium as well as the neck tapering above, the fruit therefore ending in 

 a short beak. 

 Branches of the umbel in fruit ascending; fruit IS mm. or more long; beak 

 Z mm. or more. 5. O. intermedia. 



Branches of the umbel in fruit divaricate; fruit 12-13 mm. long; beak 

 scarcely more than 1 mm. long. 6. O. divaricata. 



Pedicels shorter than the fruit. 7. O. brevipes. 



6. GLYCOSMA Nutt. 



Fruit 12-16 mm., rarely 18 mm. long, on erect pedicels. 

 Fruit 20 nun. long or more, on spreading pedicels. 



7. LEIBERGIA Coult. & Rose. 



8. OROGENIA S. Wats. Turkey Peas. 

 Stem from a deep-seated round corm. 



Stem from a fusiform long root. 



9. EULOPHUS Nutt. 



10. ATENIA H. & A. Yamp, Squaw-root. 

 Leaflets of all the leaves flUform to linear-lanceolate. 



Leaflets flUform. 

 Leaflets linear-lanceolate. 

 Leaflets of the basal leaves ovate-lanceolate or broadly lanceolate. 



1. G. ocoidentalis. 



2. G. maxima. 



1. L. orogenioides. 



1. O. linearifolia. 



2. O. Leibergii. 



1. E. Bolandcri. 



1. A. Gairdneri. 



2. A. montana. 



3. A. Garrettii. 



