296 COMPOSITE. [Lapsana, 



4. LACTUCA. Linn, {part of.) 



Involucrum cylindraceum, squamis seu foliolis erectis imbricatls, exterioribus latioribus. 

 Receptaculum planum, nudum. Achenia compressa. Pappus mw^us^ stipitatus, pilis scabris 

 seu Igevibus. 



1. Z. elongata; subglabra, foliis uncinatis dentatis subtus glaucis inferioribus petiolisque 

 hirsutis superioribus subintegi'is, floribus coiymboso-paniculatls. IVilld. Enunu p. 817. 

 Pursh, Fl. Am. v. 2. p. 500. Elliott^ Carol v. 2. p. 252. — L. longifolia. Mich. Am. v. 2. 

 /). 85. (fide Elliott.)— L. hirsuta. Mithl Cat—Nutt. Nov, Gen. v. 2. p. 124? 



Hab. Lake Huron. Dr. Todd. Plains of the Sastatchawan. Dr. Richardson. Dnmmond. — As the 

 lower leaves of this plant are frequently hairy, especially upon the petioles, I am disposed to helieve that 

 the L. hirsuta of Muhl. Cat. is the same species, and Dr. Torrey entertains a similar opinion. 



5. LEONTODON. Linn. 



Involucnim imbricatum, foliolis appressis seu exterioribus patentibus. Receptaculum 

 planum, punctatum, nudum. Pappus stipitatus, simplex. 



1. L. Taraxacum; involucri squamis inferioribus reflexis, foliis runcinatis dentatis. 

 Linn. Sp. PL p. 1122. Engl. Bot. t 510. Pursh, Fl. Am. v. 2. p. 497. 



Hab, Throug-hout the British Possessions, and on both sides of the Rocky Mountains. 



2. L. palustre; involucri foliolis erectis appressis, foliis sinuato-dentatis glabriusculis. 

 Engl. Bot. t 533. Rich, in Frankl. \st Journ. ed. 2. App. p. 29. 



Hab. Throughout the British Possessions, and from Hudson's Bay to the Pacific. 



3. L. hirsutum ; ubique hirsutum, involucri foliolis erectis appressis, foliis pinnatifidis 

 segmentis insequalibus remotis acuminatis. 



Hab. Meuzies Island, and sandy banks of the Columhia. Douglas. Dr. Scouler. — The leaves of this are 

 very different fi-om any of the numerous varieties of the two preceding^ species that I have seen ; and they 

 and the scapes and involucres are very hairy; the latter clothed with fulvoxK hairs. 



6. APARGIA. Schreb. 



Involucnim imbricatum, foliolis interioribus sequalibus, exterioribus minoribus. Recep- 

 taculum nudum, punctatum. Pappus plumosus, sessilis. 



1, A, autumnalis ; scapo ramoso superne squamoso, foliis lanceolatis dentatis seu pinna- 

 tifidis glabriusculis, pedunculis superne incrassatis, involucro subpubescente. — Willd. Sp. 

 PL p. 1550. Pursh, Fl. Am. v. 2. p. 497. — Hedypnois autumnalis. Huds. — Engl. Bot. t 

 830. — Leontodon autumnale. Einn, 



Hab. Newfoundland. Mr. Cormack. — Pursh gives this plant as a doubtful native of the New England 

 States. It is probably also introduced into Newfoundland from Europe. 



7. LAPSANA. 



Involucrum subcylindraceum e foliolis paucis basi squamulosum. Receptaculum nudum. 

 Achenia oblonga basi attenuata. Pappus nullus. 



1. L. communis; involucri fructu angulato, caule paniculato, pedunculis gracilibus, 

 foliis ovatis petiolatis angulato-dentatis. — Linn. Sp. PL p. 1141. EngL Bot. t. 844. 



Hab, Canada. Mrs. Sheppard. Probably introduced from Europe. 



H + 



