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.

"fine" is not a number.

... more about "Lactuca ludoviciana"
obtuse;acute +
scarious +
ovate +  and lanceolate +
paniculiform +
indeterminate +  and determinate +
John L. Strother +
(Nuttall) Riddell +
decurrent +
Sonchus ludovicianus +
filiform +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.45 cm4.5 mm <br />0.0045 m <br />) +
compound +  and simple +
lanceolate;oblanceolate linear or filiform +
brown +  and blackish +
tuberculate +, rugose +, muricate +  and smooth +
flattened +
0.45 cm4.5 mm <br />0.0045 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
deltate;lanceolate +
filiform +
simple +, barbellulate +  and nearly smooth +
zygomorphic +, actinomorphic +  and (3-)5-merous +
bluish +  and yellow +
fuscous +  and white +
subtending +
0.005 cm0.05 mm <br />5.0e-5 m <br /> (0.02 cm0.2 mm <br />2.0e-4 m <br />) +
purplish +  and blackish +
tapered +, beaked +, flattened +, obcompressed +, compressed +, prismatic +, fusiform +, ellipsoid +, columnar +  and clavate +
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 +
1(-3)-nerved +
rugulose +
winged +  and beaked +
dispersed +
Openings in woods, stream banks, prairies +
in corymbiform to paniculiform arrays +  and singly +
indeterminate +
each +  and sessile +
0.2 cm2 mm <br />0.002 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
campanulate;cylindric +
1.2 cm12 mm <br />0.012 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
petiolate +  and sessile +
cauline +  and basal +
denticulate +
piloso-setose +
2-carpellate +
0.7 cm7 mm <br />0.007 m <br /> (1.1 cm11 mm <br />0.011 m <br />) +
persistent +
0.5 cm5 mm <br />0.005 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
Flowering Jun–Sep. +
connate +  and distinct +
5 +  and 13 +
W. J. Med. Phys. Sci. +
flat;convex +
1 +  and 9 +
exalbuminous +
hairy +  and glabrous +
appendaged +  and truncate +
papillate +
Lactuca campestris +
Lactuca ludoviciana +
species +
15 cm150 mm <br />0.15 m <br /> (150 cm1,500 mm <br />1.5 m <br />) +
shrub +  and subshrub +