168 AMMIACEAE 



Lateral wings thick and corky; plants large. 

 Q 33. Lepto.o:xia. 



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. Cyxomarathrltm. 



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

 petals wliite. 35. Angelica. 



Dorsal ribs flhform; 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, onlj- m 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. COXIOSELIXUM. 



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

 sohtary ia all intervals. 40. Oxypolis. 



1. DAXJCUS (Tourn.) L. Carrot. i. D. pusillus. 



2. CAUCALIS L. l. C. microcarpa. 



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



1. E. arliculatum. 



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. septcntrionalis. 



5. OSMORRHIZA Raf. Sweet Cicely. 



Involucels of several bractlets. 1. O. longistylis. 

 Involucels lacldng or of a single small bractlet. 



Fruit obtuse at the ape.x, without a neck. 2. O. obtusa. 

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

 Pedicels longer than the fruit. 



Stylopodium short, broad and flat, maldng the fruit almost trvmcate at the 

 apex; plants almost glabrous. 



Corolla purple. 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 mnbel in fruit ascending; fruit 15 mm. or more long; beak 



2 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. diearicala. 



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



6. GLYCOSMA Nutt. 



Fruit 12-16 mm., rarely 18 mm. long, on erect pedicels. 1. G. occidentalis. 



Fruit 20 mm. long or more, on spreading pedicels. 2. G. maxima. 



7. LEIBERGIA Coult. & Ross. l. L. orogcnioides. 



8. OROGENIA S. Wats. Turkey Peas. 



Stem from a deep-seated roimd corm. 1. O. linearifolia. 



Stem from a fusiform long root. 2. O. Leibergii. 



9. EULOPHUS Xutt. l. E. Bolandiri. 



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

 Leaflets of all the leaves flhform to linear-lanceolate. 



Leaflets filiform. 1. A. Gairdneri. 



Leaflets hnear-lanceolate. 2. A. montana. 



Leaflets of the basal leaves ovate-lanceolate or broadly lanceolate. 3. A. Gwrettii. 



