4. LACTUCA. Linn, (partóf.)'
Involucrum cylindraceum, squamis seu foliolis erectis imbricatis, exterioribus latioribus.
Receptaculum planum, nudum. Achenia compressa. Pappus niveus, stipitatus, pilis scabris
seu lasvibus.
1. L . elongata ; subglabra, foliis uncinatis dentatis subtus glaucis inferioribus petiolisque
hirsutis superioribus subintegris, floribus corymboso-paniculatis. Willd. Enum. p. 817.
Pursh, Fl. Am. v. 2. p. 500. Elliott, Carol, v. 2. p . 252.— L. longifolia. Mich. Am. v. 2.
p. 85. (fide Elliott.)—L. hirsuta. Muhl. Cat.—Nutt. Nov. Gen. v. 2. p. 124?
Hab. Lake Huron. Dr. Todd. Plains of the Saskatchawan. Dr. Richardson. Drummond.—As the
lower leaves of this plant are frequently hairy, especially upon the petioles, I am disposed to believe that
the L. hirsuta of Muhl. Cat. is the same species, and Dr. Torrey entertains a similar opinion.
5. LEONTODON. Linn.
Involucrum 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. PI. p. 1122. Engl. Bot. t. 510. Pursh, Fl. Am. v. 2. p . 497.
Hab. Throughout 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. ls£ Joum. 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. Menzies Island, and sandy banks of the Columbia. Douglas. Dr. Scouler.—-The leaves of this are
very different from 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 fulvous hairs.
6. APARGIA. Sclireb.
Involucrum imbricatum, foliolis interioribus sequalibus, exterioribus minoribus. Receptaculum
nudum, punctatum. Pappus plumosus, sessilis.
1. A. autumnalis ; scapo ramoso supeme squamoso, foliis lanceolatis dentatis seu pinnatifidis
glabriusculis, pedunculis superne incrassatis, involucro subpubescente.— Willd. Sp.
PI. p . 1550. Pursh, Fl. Am. v. 2. p. 497.—Hedypnois autumnalis. Huds.—Engl. Bot. t.
830.—Leontodon autumnale. Linn.
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. PI. p. 1141. Engl. Bot. t. 844.
Hab. Canada. Mrs. Sheppard. Probably introduced from Europe.
8. CICHORIUM. Linn. .
Involucri foliola duplici serie. Receptaculum subpaleaceum. Achenium erostre, turbin-
atum, conforme. Pappus brevis, biserialis, pilis paleaceis ellipticisobtusis.
'1. C. Intybus; floribus geminatis subsessilibus, foliis uncinatis.—Linn. Sp. PI. p. 1142.
Engl. Bot. t. 539.
Hab. Canada. Mrs. Percival. Mrs. Sheppard.—Introduced from Europe.
9. CREPIS. Linn.
Involucri foliola duplici serie, externa laxa, brevia. Receptaculum nudum. Achenium
teres, sensim in rostrum breve attenuatum. Pappus pluriserialis, albus, mollissimus.
1. C. biennis; caule elato sulcato, foliis radicalibus obovato-lariceolatis plerumque run-
ciriato-dentatis seu pinnatifidis summis lanceolatis, involucro subscabro pubescente.—Linn.
Sp. PI. p. 1136. Engl. Bot. t. 149.—$. foliis latioribus plerumque runcinato-dentatis rarius
pinnatifidis nunc omnino integerrimis.
Hab. /3. Carlton House, on the Saskatchawan, to the Prairies on the Rocky Mountains. Drummond.
Lake Huron. Dr. Todd.—The radical leaves of this are invariably wider than in any specimens I have
seen of the Europaean C. biennis, and more entire; yet I dare not venture to consider it a different species.
2. C. elegans; humilis glaberrima, radice multicipite, caulibus erectis dicliotomis multi-
floris, foliis inferioribus spathulatis superioribus linearibus, involucris cylindraceis, acheniis
tenuissime rostratis.
Hab. “ Battures” of the Assinaboyne River. Drummond.—Allied to the following, but unquestionably
distinct. The stems are numerous from the summit of the fusiform root, 5-6 inches high, dichotomous and
leafy, the leaves gradually narrower upwards.
3. C. nana; humillima glaberrima, caulibus subnullis, foliis ovatis subrotundatisve longe
petiolatis flores superantibus, involucris cylindraceis, acheniis in rostrum attenuatis.— a. foliis
ovatis acutiusculis integris.— C. nana. Rich, in Frankl. ls£ Journ. ed. 2. App. p. 29. Hook,
in Parry’s 2d Voy. App. p. 397. t. I.—0. foliis subrotundatis plerumque lyrato-pinnatifidis.
H ab. «. Barren grounds fromlat 64° to the Arctic Seaand Islands. Dr. Richardson. Capt. Sir E. Parry.
—(3. On the slaty debris of the Rocky Mountains. Drummond.—The alpine specimens have the leaves usually
rounder and pinnatifid.
10. HIERACIUM. Linn.
Involucrum imbricatum, ovatum. Receptaculum nudum, punctatum seu ’ pilosum.
Pappus uniserialis, pilosus, seepissime sordide flavescens. Achenium erostre, sulcatum.
1. H.pusillum; pusillum villosissimum, caule simplici erecto unifloro remote subfoliato,
foliis lanceolatis attenuatis acutis integerrimis caulinis linearibus, calyce villosissimo. Pursh,
Fl. Am. v. 2. p . 502.
H ab. Labrador. Kohlmeister. (Pursh.)—“ A very small plant, with flowers the size of a daisy. It
strongly resembles H. alpinum, and is probably only a diminutive var. of it.”
2. H. venosum; scapo nudo corymboso-paniculato glabro, pedicellis filiformibus, foliis
obovato-lanceolatis supra rariter pilosis subtus nudis margine ciliatis glanduloso-denticulatis,