130 rONTRIBUTIONS FROM THE NATIONAL UERDARIUM. 



LcallctH Hiiuill, laciniatrly toothed or i)innatifiil. 

 Stems more or les^s leafy. 



Fruit merely ril)lHMl, not at all wiiified. 



(ilahrous tliroU},'lioMt; fruit narrow ly olilonff 4. L. nilifomiriDii. 



lullorescenci' jiulieruleiit; fruit Itroadly oMou^.'. 



■ Leaflets coarsely tootlu'd or lolled '>. /,. a/ilixhiriiiii. 



Leaflets deeply eleft into line.ir lolies (1. /,. (i]>iij'uliiiiii. 



l''ruil more or k-s.s winged. 



Leaflets more or less eonfluent 7. L. cHnbyi 



Lt^aflets more (jr lesH distinct. 

 Fruit 4 to 5 nun. long. 



Involuci'ls none .S. L. Irilicri/i. 



Involucels present it. /.. sinmliDis. 



Fruit () to 7 nun. long. 



I'ltimate leaf divisions narrowly linear 10. I.. Jillciii'iin. 



Ultimate leaf divisions not narrowly lini'ar. 



Pi'dicels () to S mm. loJig; iidlorescence puLernlent or 



glabrous 11. //. jxnioi. 



Pedifels slender, 8 to 15 mm. long; glabrous through- 

 out 12. /,. i/(il<lniaiii. 



Stems naked or nearly so, giving an aeauleseent a])i>earaii('e. 



Leaves with ultimate divisions narrowly linear tolilifoi'ni. 1.'!. /,. hiiiiifoliiiiii. 

 Leaves with ultimate divisions broader. 



Flowers piu-ple or purplish 14. />. parpitri'n)ii. 



Flowers white. 

 Leaflet.s small and erowiled. 



Kays 1 to 2 cm. long 15. 7,. (irttyi. 



Kays 2.5 to 5 cm. long Ui. L. <>ir(j<iiiiiiii. 



Leaflets larger and distant. 



Rays 5 cm. long or more 17. L. ciisivliii. 



Kays 2.() to 3.5 cm. long IS. /.. pniKjIi i. 



Low aeauleseent plants with .simply pinnate leaves. 



Involucre conspicuous; .Vlaskan lit. /,. iiKiminiii. 



Involucre wanting or of 1 or 2 bracts; mountains of southwest 



Colorado 20. L. (•(tHUvoodm . 



1. Ligusticum canadense (L. ) Brittoji, Mem. Ton-. C'lul) 5 : 240. 181t4. 



Fio. 48. 



Ferula can(idcHSi>i'L. Sp. PI. 1: 247. 1753. 

 Ligusticum aciaeifolium of auth(jrs. not of Michx. 



Stem .stout, ])ranched above, 6 to IS dm. hig-li, loafv. with .somowhiit 

 piil)enilent inflorofscenoe; loaves laro'o, 3 to 4-t('i'ii!ite: leaflets 5 to 1-! 

 cm. lonj^', vai'iiihle in size and tootliino-. usually Itiro-c and ovate ov 

 ohlon"' (often broadly so), and eoarsely serrate, sometime.s small and 

 lanceolate and sparsely toothed or even entire; iimlud 10 to 20-raye(l. 

 with involucels of few short bnictlets; rays (fniitinj;) 2.5 to 5 cm. lono': 

 pedicels 2 to 4 nun. lono-; fruit ovate, 4 to t> mm. lony, with promi- 

 nent somewhiit wiugvd ribs; oil tubes 3 or 4 in the intervals, on the 

 commissural side. 



Type locality, '"Virginia;" collected by Cidt/ton. 



From southern reunsylvania to Georgia, and west to Missouri. 



