250 AMMIACEAE. 



Family loo. AMMIACEAE Tresl. Carkoi I-'amii.v.- 



Fruit bristly or spiny. 



Fruit subglobose, covered with hooked spines ; leaves pahiiately divided. 



I. San I cu LA. 

 Fruit linear or linear-oblanceolate, attenuate at the base, bristly on the angles; 

 leaves twice to thrice ternate. 2. Washingtonia. 



Fruit neither spiny nor bristly. 



Fruit not strongly flattened dorsally, usually more or less laterally flattened. 

 Oil-tubes obsolete in the mature fruit, which is linear ; leaves twice or thrice 



ternate. 3. Glvcosma. 



Oil-tubes present. 



Oil-tubes solitary in the intervals ; petals white. 

 Stylopodium conical. 



Divisions of the leaves linear to filiform ; ribs of the fruit filiform. 



4. Carum. 

 Divisions of the leaves lanceolate ; ribs of the fruit thick obtuse wings. 



5. CiCUTA. 



Stylopodium flat or wanting ; petals yellow. 

 Ribs broad and corky. 



Dwarf cespitose alpine subacaulescent plants ; fruit not tuberculate. 



6. Oreoxi.s. 

 Tall plants, 3 dm. high or more ; fruit tuberculate-roughened. 



7. Harbouria. 

 Ribs not corky. 



Tall and branching, leafy-stemmed plants with broad leaf-divisions ; 



ribs inconspicuous. 8. ZiziA. 



Acaulescent and cespitose plants ; ribs of the fruit prominent. 



9. Aletes. 

 Oil-tubes more than one in the intervals. 

 Stylopodium conical. 



Fruit round, with globose carpels and very slender inconspicuous ribs. 



10. Berula. 

 Fruit ovate or oblong, with prominent equal ribs. 



11. LiGUSTICUM. 



Stylopodium flat or wanting. 



Seed-face sulcate or decidedly concave. 



Ribs filiform. 12. Musenion. 



Ribs with broad thin wings. 13. Aulospermum. 



Seed-face plane or but slightly concave. 

 Ribs all conspicuously winged. 



Leaves pinnate with short crowded and more or less confluent 

 segments ; flowers usually purple or white. 



14. Phellopterus. 

 Leaves ternale-pinnate with short linear and pungent segments; 

 flowers usually yellow. 15. Pteryxia. 



Ribs not winged. 



Lateral ribs thick and corky ; the dorsal ones filiform. 



16. Orogenia. 

 Ribs all corky and equally prominent. 



Plant tall and leafy ; oil-tubes never present in the dorsal ribs. 



17. Shim. 



Plant low, acaulescent ; oil-tubes present in the dorsal ribs. 



6. Oreoxis. 

 Fruit strongly flattened dorsally, with the lateral ribs more or les? promi- 

 nently winged. 

 Stylopodium present. 

 Stylopodium conical. 



Plant glabrous with linear to lanceolate leaf-segments. 



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

 in the intervals. 18. Oxvpolis. 



