CARROT FAMILY 607 



1 Ribs unlike, the dorsal ones filiform; the lateral ones corky and 

 inflexed towards those of the other carpel; commissure with 

 a corky projection which connects the carpels to the gyno- 

 phore, leaving two air spaces between the carpels, this pro- 

 jection, and the lateral wings; plants with corms. 



8. OROGENIA. 



ft Ribs all nearly alike; commissure not with corky projection. 

 J Stylopodium conic. 



Leafy plant with white or pinkish flowers. 



Plants with fascicled tuberous roots and few narrow 



mostly entire leaf-segments. 

 Seed-face concave with a longitudinal ridge; oil-tubes 



several in the intervals. 9. EULOPHUS. 

 Seed-face plane; oil-tubes solitary in the intervals. 



10. ATENIA. 

 Plants with taproots or rhizomes. 



Fruit round, with sub-globose carpels and very slender 

 inconspicuous ribs; leaves pinnate; oil-tubes 

 several. n. BERULA. 



Fruit ovate or oblong, with more prominent ribs. 

 Oil-tubes solitary in the intervals; leaves twice or 

 thrice pinnately compound. 



12. CARUM. 

 Oil-tubes several in the intervals; leaves ternately 



or ternate-pinnately compound or decompound. 



13. LIGUSTICUM. 

 Acaulescent plants with yellowish green flowers and simply 



pinnate leaves; oil-tubes several in the intervals. 



14. LlGUSTICELLA. 



it Stylopodium flat or wanting; flowers yellow. 



Leaves simple; oil-tubes wanting or continuous around the 



seed cavity. 15. BUPLEURUM. 



Leaves compound, or only the basal ones simple; oil-tubes 



present and not continuous in the intervals 

 Caulescent perennials, with taproots. 



Oil-tubes solitary in the intervals; Stylopodium want- 

 ing; root neither deep-seated nor conspicuously 

 thickened; leaves ternately compound or the 

 basal ones simple, cordate. 



16. ZIZIA. 



Oil-tubes several in the intervals; Stylopodium flat; 

 root deep-seated and usually decidedly* thickened, 

 fusiform. 17. MUSINEON. 



Acaulescent cespitose perennials, with short branched 



caudices. 

 Oil-tubes 2 or 3 in each interval; divisions of the 



leaves filiform. 18. DAUCOPHYLLUM. 



Oil-tubes solitary in the intervals; divisions of the 

 leaves elliptic, ovate, or obovate. 



19. ALETES. 

 ** Ribs all corky. 



Cespitose perennials with branched caudices; flowers yellow or 



yellowish. 

 Fruit not tubercled; dwarf acaulescent plants. 



20. OREOXIS. 

 Fruit tubercled; stem about 3 dm. high, few-leaved. 



21. HARBOURIA. 



Not cespitose perennials, with short rootstocks and fibrous roots; 



flowers white; tall plants. 



Ribs equal and prominent. 22. SIUM. 



Ribs unequal; the dorsal ones very low and broad; the lateral 



ones prominent and thick. 23. CICUTA. 



Ribs conspicuously winged. 

 Plant pseudo-scapose* from a deep-seated fleshy root; leaves fleshy. 



with obtuse segments. 



Seed-face deeply grooved. 24. AULOSPERMUM. 



Seed-face shallowly concave. 25. PHELLOPTERUS. 



Plant from a cespitose caudex or rootstock. 



Seed-face deeply grooved; segments of the leaves ovate or lanceolate. 



26. CORIOPHYLLUS. \ 



Seed-face broadly and shallowly concave; leaves with oblong, sub- 

 ulate or linear-filiform divisions. 



Ribs broadly winged; main divisions of the leaves ternate; 

 Stylopodium wanting; flowers yellow, except in one species. 



27. PTERYXIA. 



Ribs narrow; leaves bipinnate; Stylopodium present but flat; 

 flowers white. 28. PSEUDOREOXIS. ... . , 



* Stem mostly subterranean, but rising somewhat above ground and bearing at the end 

 a cluster of leaves and peduncles. 



