^abalus.] COMPOSITE. 393 



Hab. Newfoundland. Miss Brmton.—VrohahXy introduced, as Avell as the former, from the Old World. 



3. S. pallidus; racemis compositis, pedunculis squamosis, foliis lanceolatis dentatis glabris 

 amplexicaulibus superioribus acuminatis. Sm.— Willd. Sp, PL v, 3. p, 1521. Fursli, FL 

 Am, V. 2, p. 502. Sm. in Bees' Cycl n, 33.— Lactuca Canadensis. Linn. Sp. PL p. 1119. 



Hab. Canada. Linn(Bus, — Flowers small, yello^v. Pursh. 



4. S. alpinus; radice perenni, foliis amplis lyratis basi cordatis lobo termlnali inaxinip 

 triangulari, pedunculis subracemosis involucrisque glanduloso-hispidis (floribus caTuleis.) — 

 Linn. Sp. PL p. 1117. Purshj FL Am. v. 2. p. 501.— S. caeruleus. EngL BoL L 2125. 



Hab. Canada. Pursh. 



5. S. Sibiricus ; radice annua, foliis lanceolatis sessilibus glabris integerrimis dentatis run- 

 cinato-pinnatifidisve, pedunculis squaniulosis paniculatis involucrisque glaberrjinis (floribus 

 caeruleis.) — Linn. Sp. PL p. 1118. Eich. in FranlL \st Journ. cd. 2. App. p. 30. GmcL 

 FL Sib. v.2.p. 11. t 3. 



1 



Hab. From Lake Huron, (Dr. Tudd^ throughout the whole central pai't of British North America, to 

 Fort Franklin in lat. 66°. Dr. Richardson, Drummondj Douylus. Plains of the Columbia, near the sea. 

 Douglas, — This is liahle t» much diversity in the form of the leaves. The upper ones indeed are always 

 entire, but varying in their relative length and breadth ; the lower ones often toothed, pinnatitid, with narrow 

 segments, frequently ruuciuate. The flowers are numerous, large, handsome, blue. The blue-flowered Soiv- 

 thistles constitute the genus Agathyreus of Mr. Don. 



6. S. leucophcBus ; foliis sessilibus runcinatis acute dentatis glabris, caule paniculato-vir- 

 gato, pedunculis racemosis squamosis involucrisque glabris (floribus parvis albis, pappo 

 fulvo.) — Willd. Sp. PL p. 1520. Purshy PL Am, v. 2. p. 501. — 13. panicula patentissinia. 



Hab. Lake Huron. Dr. Todd. Dr. Torrey, in Herb. Nostr. Etchmin, Canada. Mrs. Sheppard. Sas- 

 katchawan. Drummond. — /3. Columbia River. Dr. Scouler. — This, I think, is certainly the S. Icucophceus of 

 WiUdenow, who aptly compares it with the S. alpinus of Smith in Ic. PI. t. 21, observing tliat the aUtsa. i« 

 more branched and paniculato-virgate, the flowers smaller, white, or bluish, which precisely corresponds with 

 ur specimens. I possess the same plant, sent by Dr. Torrey, inadvertently, as Lactuca hirsuta,* MuhL 

 1 am doubtful about the genus. The foliage and general aspect are those of a Sanckus; while the small 

 flowers and pappus look more like those of Nahalus; hut the former are not pendent, nor the latter of so deep 

 a tawny hue as in that genus. We have cultivated it in the GUsgow Botanic Garden, from seeds collected 

 by Mr. Drummond ; and I possess specimens gathered by the Rev. Mr. Schweinitz in Pennsylvania. My 

 single specimen of var. /3. is in a very indifferent state of preservation, and may be a distinct species. 



2. NABALUS. Cass. 



Flores nutantes. Involucrum cylindricum 5-12-florum e squainis erectis uniserialibus 



basi squamulosis. Eeceptaculum nudum. Achema lincari-oblonga subcylindrica striata, 



Pa/?/)MS coloratus sessilis scoher.— Habitus Vreenixnihidls, sed Jlores albidi, itivolucr a piuri- 



flora, flosculi albidi, pappus coloratus fulvus. Folia ampla pkrumque petiolata Integra 



sinuata vel pinnatifida. 



* Another specimen sent to me afterwards, by the same Botanist, under the name of Z. hlrsuta, is a true 

 Liunajan Lactuca. 



