Lactuca biennis

(Moench) Fernald

Rhodora 42: 300. 1940

Basionyms: Sonchus biennis Moench Methodus, 545. 1794
Treatment appears in FNA Volume 19. Treatment on page 261. Mentioned on page 260.
Click plate for higher resolution version.
Illustrator: Marjorie C. Leggitt
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

Distribution

V19-348-distribution-map.gif

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"
AuthorJohn L. Strother +
Authority(Moench) Fernald +
BasionymsSonchus biennis +
DistributionSt. 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. +
Elevation900–1500 m +
HabitatSwamps, stream banks, woods +
IllustratorMarjorie C. Leggitt +
PhenologyFlowering Jul–Oct. +
Publication titleRhodora +
Publication year1940 +
ReferenceNone +
Source xmlhttps://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/f6b125a955440c0872999024f038d74684f65921/coarse grained fna xml/V19-20-21/V19 348.xml +
SynonymsUndefined tribe Lactuceae +
Taxon familyAsteraceae +
Taxon nameLactuca biennis +
Taxon parentLactuca +
Taxon rankspecies +
VolumeVolume 19 +