54 



Artificial Key to Species. 



I. Plants with n-/obosc tubers. 



* Plorcos yelhzv : oil-tubes solitary. 



Fruit puberulent Coun, () 



Fruit glabrous. 



luvolucels wanting (titibif;uiim, 7 



Involucels conspicuous cii-nniKJatum, S 



* * Floxvers white. 



Oil-tubes numerous. 



Fruit rough-puberulent ^Votfionu .'5 



Fruit glabrous f,n-in(n^H)ii, 5 



Oil-tubes solitary. 



Fruit wings as broad as body or broader t'linjearpum, 12 



Fruit wings half as broad as body Canhiji, 2 



Fruit wings narrower, thiokish and involute Ht'iuletnoni, 1 



Root moniliform Geyeri, 4 



II. Plants without globose tubers. 



* Floxvers purplish AuNtimr, 2") 



* * F-'loxvers -white. 



Oil -tubes numerous. 



Fruit tomentose tomi'tifoMttDi, II 



Fruit with abundant close pubescence, and prominent 



dorsal ribs MolniveiiNc, 1.") 



Fruit sparsely pubescent, and with rather obscure dor- 

 sal ribs XcvadeiiKC, Ki 



Fruit glabrous. 



Plant glabrous C'iinirkii. :>2 



Plant closely pubescent Pdi-ishii, IJl 



Oil-tubes soUtary. 



Fruit pubescent dusi/cfd-pHni, i:> 



Fruit glabrous. 

 Fruit large (.) to 12 lines long): pubescent plants- 

 Fruit wings as broad as body oi broader eiirycarpum, 12 



Fruit wings narrow iiKtcrorarpum, 1 1 



Fruit small (2 to .') lines long). 



Fruit ro'\nd: plant pubescent nvdicatite, 17 



Fruit oblong: plant glabrous ('it»ickii, :>2 



Oil-tubes obsolete hh-olor, 30 





I^lo-wers yellow. 



Oil-tubes obsolete hicolor, 30 



Oil-tubes solitary. 



