294 COMPOSITE. [Nabalus, 



1. N. racemosus ; caule simplici, foliis indivisis integerrimis vel dentatls inferioribus 

 obovato-oblongis longe petiolatis, petiolis alatis superioribus oblongo-ovatis sessilibus semi- 

 amplexicaulibus, racemo elongate composito, peduncnlis involucrisque hirsutissimis. 

 Praenandies racemosa. Mich, Am. v, 2, p. 84. Pursh, Fl. Am. v. 2. p. 500. — Harpalyce 

 racemosa. Don^ in Ed. N. Phil. Journ. 1829. p. 308. 



Hab. Northern parts of Canada. Michaux, Plains of the Saskatchawan. Dr. Richardson. Di-ummond. 



2. N. altissimits ; caule ramoso, foliis trilobis petiolatis angulatis denticulatis margine 

 scabris, racemis axillaribus, floribus nutantibus, involucris subquinquefloris. Pursh. — Prse- 

 nanthes altissima. Willd. Sp. PL v. 3. p. 1537. Purshy FL Am. v, 2. p. 498. Elliott^ 

 Carol V. 2. p. 25G.~Plukn. Aim. t. 347./ 2. 



Hab. Canada. Pursh. Newfoimdland. Mr. Cormack. 



3. N", cordatus; caule superne panlculato, foliis petiolatis cordatis dentatls ciliatis, 

 floribus sessilibus oblongis integerrimis, panicula laxa racemiflora, floribus nutantibus, 

 calycibus 6-fidis 6-floris. Pursh. — Prasnanthes cordata. Willd. Hort. Berol. t 25. Pursh, FL 

 Am. V. 2. p. 498. Elliott, Carol, v. 2. p. 257. 



Hab. Canada, Goldie. — Mr. Pursh acknowledges this to be an intermediate species between the pre- 

 ceding and N. albus. 



4. N. alatus ; annuus, caule simplici, foliis longe petiolatis acutissimis deltoideis sinuato- 

 dentatis, petiolis alatis, panicula laxa parva, pedunculis involucrisque pubescenti-hirsutis. 

 (Tab. CII.) 



Radix parva, subfusiformis, ut videtur, annua. Caulis simplex, erectus, glaber, pedalis et ultra, superne 

 paniculatus. Folia sublonge petiolata, membranacea, glabra ; superiora sparse pubescentia, deltoidea, acutis- 

 sima, sinuato-dentata, angulis acutis subdeflexis ; suprema lanceolata, sessilia, integerrima. Panicula parva, 

 laxa. Pedunctdi pubescenti-hirsuti. Flores nutantes, majusculi (albi?) Tnvolucrum cylindraceujn, foliolis 

 squamisque pubescenti-hirsutis. Flosculi 7-9, apice 5-dentati. Styli exserti. Achenia linearia, striata. 

 Pappus scaber, pallide fulvus ; pilis numerosis. 



Hab. Fort Vancouver and Observatory Inlet, on the North -West coast of America. Dr. Scouler. 

 Tab. CII. N. alatus. Fig. 1, Flower; Jig. 2, Fruit; fig. 3, Hair from the pappus: — magnified. 



5. N. albus ; foliis radicaHbus angulato-hastatis dentatls sublobatis, caullnis subrotundo- 

 ovatis dentatis petiolatis sumjpiis lanceolatis, panicula laxa, fasciculis terminalibus nutantibus, 

 involucri8-phyllo9-10-flori. Pursh. — Prsenanthes alba. Willd. Sp. PL v. 3./). 1536. Pursh, 

 FL Am. V. 2. p. 499, Sims, Bot. Mag. t. 1079, (excell.) Elliott, Carol v. 2. p. 259. BigeL 

 Fl. Bost. ed. 2. p. 259. 



Hab. Lake Huron. Dr. Todd. Quebec. Lady Dalhousie, Mrs, Percival. Newfoundland. Mr. Cor- 

 mack^ Miss Brenton. 



6. N. serpentarius ; foliis dentatis asperis (?) radicalibus palmato-sinuatis caulinis longe 

 petiolatis sinuato-pinnatifidis subtrilobis lacinia intermedia 3-partlta summis lanceolatis, 

 racemis terminalibus subpaniculatis brevibus nutantibus, involucri 8-phyllo 12-flori. 

 Prsenanthes serpentaria. Pursh, FL Am. v. 2. p. 499. t. 24. 



Hab. Lake Huron. Dr. Todd. Quebec, Mrs. Percival. Sillery. Mrs. Sheppard. Newfoundland, 

 Mr. Cormack.~Onr specimens, from the localities now mentioned, so exactly accord with the figure above- 

 quoted of Pursh, that I cannot at all question their being the true Prcenantkes serpentaria; and 



