Heradeum.] UMBEL LIFERS. 



269 



of Mr. Douglas, from the Columbia, but in too imperfect a state to enable me to refer them satisfactorily to 

 this or any other Genus. 



21. IMPERATORIA. Linn, 



Calycis margo obsoletus. Petala obovata in lacinulam inflexam coarctata emarginuta vel 

 subintegra. Fructus a clorso piano vel lenticulari-compressus margine dilatato complanato 

 cinctus. Mericarpia jugis subsequidistantibusj 3 intermediis filiformibus, 2' lateralibus 

 obsoletioribus margine dilntato contiguis vel in eundcm abeuntibus. Fallecul^e l~\'iUat3B, 

 laterales subinde sesqui-vel bivittatae. Coinmissura ssepius bivittata. Carpopodimn biparti- 

 tum. Semina antice plana. — Herbae glahrm pereimes, Caulis teres striatus. Folia hi-aut 

 triternatl-secta^ seginentis ovatis ohlongisve serratis. Umbcllse ainplce composite, Involu- 

 crum nullum. Involucella oligophylla, Flores albu—Species hahitu accedunt hinc ad 

 ultimam Peucedani sect^ illinc ad Angelicam, DC* 



1. /. Ostruthium; foliis ternato-sectis, segmentis late ovatis trilobatis inciso-scrratis, 

 lateralibus basi insequalibus, vaginis amplis. DC. — Linn. Sp, PL p. 372. Engl BoL t 1380. 

 De Cand. Prodr. v, 4. jw. 183. — Paccedanum Ostruthium. Koch. 



Hab. Newfoundland. De la Pylaie, in De Cand. Prodr, 



22. PA8TINACA. Linn, 



Calycis margo obsoletus vel minute denticulatus. Petala subrotunda intetrra involuta, 



lacinula lata retusa. Fructus a dorso complanato-compressus, margine dilatato complanato 

 cinctus. Mericarpia jugis tenuissimis, 3 intei-mediis sequidistantibus, 2 lateralibus margine 

 contiguis. Vittce lineares acuta jugis vix breviores, in valleculis solitarise; in commissura 

 2 aut plurimse. Carpophorum bipartitum. Semen complanatum. — Herbse radicefusiformi 

 scepius carnosa^ foliis pinnatisectis, segmentis dentatis incisis aut lohatis. Umbella composita, 

 involucra utraque nulla aut oligophylla. Flores Jiavi. DC. 



I. P. sativa ; caule sulcato foliis pinnatisectis segmentis ovato-oblongis obtusis crenato- 

 dentatis basi incisis, extremo trilobo, involucris involucellisque nullis, calycis dentibus 

 obsoletis, fructibus ovalibusj commissura bivittata. DC. — Linn. Sp. PL /?. 188. Pursh, FL 

 Am. V. 4./'. 196. Engl. Bot. t. 556. 



Hab. On the Saskatchawan and Red Rivers. Douglas. Drummond. 



23. HERACLEUM. Linn, 



Calyx 5-dentatus. Petala obovata, emarginata cum lacinula inflexa, exteriora saepe 

 radiantia bifida, Fructus a dorso piano- compressus margine dilatato complanato cinctus, 

 Mericarpia jugis tenuissimis, 3 dorsalibus sequidistantibus, 2 lateralibus margini dilatato 

 conti*Tuis remotis. Vittce dorsales 4, in valleculis solitarias, commissurales sa^pius 2, omnes 

 fructu breviores saspius clavulatfe. Carpophorum bipartitum. Semen complanatum, — 

 HerbjE a^nplcE, foliis pinnatisectis trisectis aut lobatis ; petioli ample vaginantes. Umbella* 

 multiradiatm. Involucrum caducum scepius oUgophyllum. Involucellum polyphyllum. DC. 



1. H. lanatum; foliis trisectis petiolulatis subtus tomentosis supremis trilobis, segmentis 

 late ovato-subrotundis lobatis serratis, involucellifoliolisparvissubulato-lunceolatis, fructibus 

 late obcordato-ovalibus, commissura bivittata, floribus radiantibus. — Mick. Am. v. \.p. 166. 



