Lactuca ludoviciana

(Nuttall) Riddell

W. J. Med. Phys. Sci. 8: 491. 1835.

Endemic
Basionym: Sonchus ludovicianus Nuttall Gen. N. Amer. Pl. 2: 125. 1818
Synonyms: Lactuca campestris Greene
Treatment appears in FNA Volume 19. Treatment on page 262. Mentioned on page 260.

Biennials, 15–150 cm. Leaves on proximal 1/2–3/4 of each stem; blades of undivided cauline leaves obovate or oblanceolate to spatulate, margins denticulate (piloso-ciliate), midribs usually piloso-setose. Heads in paniculiform arrays. Involucres 12–15+ mm. Phyllaries usually reflexed in fruit. Florets 20–50+; corollas usually yellow, sometimes bluish, usually deliquescent. Cypselae: bodies brown to blackish (usually mottled), ± flattened, elliptic, 4.5–5+ mm, beaks ± filiform, 2.5–4.5 mm, faces 1(–3)-nerved; pappi white, 5–7(–11) mm. 2n = 34.


Phenology: Flowering Jun–Sep.
Habitat: Openings in woods, stream banks, prairies
Elevation: 100–1400 m

Distribution

V19-353-distribution-map.gif

B.C., Man., Sask., Ariz., Ark., Calif., Colo., Idaho, Ill., Ind., Iowa, Kans., Ky., La., Minn., Mont., Nebr., N.Mex., N.Dak., Okla., Oreg., S.Dak., Tex., Utah, Wash., Wis., Wyo.

Discussion

Selected References

None.

Lower Taxa

None.
... more about "Lactuca ludoviciana"
John L. Strother +
(Nuttall) Riddell +
Sonchus ludovicianus +
B.C. +, Man. +, Sask. +, Ariz. +, Ark. +, Calif. +, Colo. +, Idaho +, Ill. +, Ind. +, Iowa +, Kans. +, Ky. +, La. +, Minn. +, Mont. +, Nebr. +, N.Mex. +, N.Dak. +, Okla. +, Oreg. +, S.Dak. +, Tex. +, Utah +, Wash. +, Wis. +  and Wyo. +
100–1400 m +
Openings in woods, stream banks, prairies +
Flowering Jun–Sep. +
W. J. Med. Phys. Sci. +
Lactuca campestris +
Lactuca ludoviciana +
species +