Lactuca biennis
Rhodora 42: 300. 1940
Basionyms: Sonchus biennis Moench Methodus, 545. 1794
Annuals or biennials, (15–)75–200(–300+) cm. Leaves on proximal 2/3–3/4 of each stem; blades of undivided cauline leaves ovate to lanceolate, margins entire or denticulate, midribs sometimes sparsely piloso-setose. Heads in paniculiform arrays. Involucres 7–12+ mm. Phyllaries usually reflexed in fruit. Florets (15–)20–30(–50+); corollas bluish or whitish, sometimes yellowish, seldom deliquescent. Cypselae: bodies brown (often mottled), ± compressed-ellipsoid, 4–5+ mm, beaks ± stout, 0.1–0.5+ mm, faces (4–)5–6-nerved; pappi ± fuscous, 4–6+ mm. 2n = 34.
Phenology: Flowering Jul–Oct.
Habitat: Swamps, stream banks, woods
Elevation: 900–1500 m
Phenology: Flowering Jul–Oct.
Habitat: Swamps, stream banks, woods
Elevation: 900–1500 m
Distribution

St. Pierre and Miquelon, Alta., B.C., Man., N.B., Nfld. and Labr., N.S., Ont., P.E.I., Que., Sask., Yukon, Alaska, Calif., Colo., Conn., Del., D.C., Idaho, Ill., Ind., Iowa, Ky., Maine, Md., Mass., Mich., Minn., Mont., N.H., N.J., N.Mex., N.Y., N.C., N.Dak., Ohio, Oreg., Pa., R.I., S.Dak., Tenn., Utah, Vt., Va., Wash., W.Va., Wis., Wyo.
Discussion
The type of Lactuca terrae-novae Fernald is probably conspecific with that of L. biennis. The type of L. biennis may be conspecific with that of L. floridana.
References
None.
Lower Taxa
No lower taxa listed.
Facts about "Lactuca biennis"
Author | John L. Strother + |
Authority | (Moench) Fernald + |
Basionyms | Sonchus biennis + |
Distribution | St. Pierre and Miquelon +, Alta. +, B.C. +, Man. +, N.B. +, Nfld. and Labr. +, N.S. +, Ont. +, P.E.I. +, Que. +, Sask. +, Yukon +, Alaska +, Calif. +, Colo. +, Conn. +, Del. +, D.C. +, Idaho +, Ill. +, Ind. +, Iowa +, Ky. +, Maine +, Md. +, Mass. +, Mich. +, Minn. +, Mont. +, N.H. +, N.J. +, N.Mex. +, N.Y. +, N.C. +, N.Dak. +, Ohio +, Oreg. +, Pa. +, R.I. +, S.Dak. +, Tenn. +, Utah +, Vt. +, Va. +, Wash. +, W.Va. +, Wis. + and Wyo. + |
Elevation | 900–1500 m + |
Habitat | Swamps, stream banks, woods + |
Illustrator | Marjorie C. Leggitt + |
Phenology | Flowering Jul–Oct. + |
Publication title | Rhodora + |
Publication year | 1940 + |
Reference | None + |
Source xml | https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/f6b125a955440c0872999024f038d74684f65921/coarse grained fna xml/V19-20-21/V19 348.xml + |
Synonyms | Undefined tribe Lactuceae + |
Taxon family | Asteraceae + |
Taxon name | Lactuca biennis + |
Taxon parent | Lactuca + |
Taxon rank | species + |
Volume | Volume 19 + |