Lactuca hirsuta

Muhlenberg ex Nuttall

Gen. N. Amer. Pl. 2: 124. 1818.

Endemic
Synonyms: Lactuca hirsuta var. albiflora (Torrey & A. Gray) Shinners Lactuca hirsuta var. sanguinea (Bigelow) Fernald
Treatment appears in FNA Volume 19. Treatment on page 262. Mentioned on page 260.

Biennials, 15–80 (–120) cm. Leaves on proximal 1/3–2/3 of each stem; blades of undivided cauline leaves ± ovate, margins denticulate (sometimes ± ciliate), midribs usually piloso-setose. Heads in corymbiform to paniculiform arrays. Involucres 12–18+ mm. Phyllaries usually reflexed in fruit. Florets 12–24+; corollas usually yellow, sometimes drying bluish, usually deliquescent. Cypselae: bodies brown, ± flattened, elliptic, 4.5–5+ mm, beaks ± filiform, 2.5–3.5 mm, faces 1 (–3) -nerved; pappi white, 6.5–8 (–10+) mm. 2n = 34.


Phenology: Flowering Jul–Aug(–Sep).
Habitat: Openings in woods
Elevation: 10–100 m

Distribution

V19-352-distribution-map.gif

N.S., Ont., P.E.I., Que., Ala., Ark., Conn., D.C., Ga., Ill., Ind., Ky., La., Maine, Md., Mass., Mich., Miss., Mo., N.H., N.J., N.Y., N.C., Ohio, Pa., R.I., S.C., Tenn., Tex., Vt., Va., W.Va.

Discussion

The type of Lactuca hirsuta may be conspecific with that of L. graminifolia.

Selected References

None.

Lower Taxa

None.

"fine" is not a number.

... more about "Lactuca hirsuta"
obtuse;acute +
scarious +
ovate +  and lanceolate +
corymbiform +  and paniculiform +
indeterminate +  and determinate +
John L. Strother +
Muhlenberg ex Nuttall +
decurrent +
filiform +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.35 cm3.5 mm <br />0.0035 m <br />) +
compound +  and simple +
lanceolate;oblanceolate linear or filiform +
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 +
N.S. +, Ont. +, P.E.I. +, Que. +, Ala. +, Ark. +, Conn. +, D.C. +, Ga. +, Ill. +, Ind. +, Ky. +, La. +, Maine +, Md. +, Mass. +, Mich. +, Miss. +, Mo. +, N.H. +, N.J. +, N.Y. +, N.C. +, Ohio +, Pa. +, R.I. +, S.C. +, Tenn. +, Tex. +, Vt. +, Va. +  and W.Va. +
10–100 m +
1(-3)-nerved +
rugulose +
winged +  and beaked +
dispersed +
Openings in woods +
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 /> (1.8 cm18 mm <br />0.018 m <br />) +
petiolate +  and sessile +
cauline +  and basal +
denticulate +
piloso-setose +
2-carpellate +
0.8 cm8 mm <br />0.008 m <br /> (1 cm10 mm <br />0.01 m <br />) +
persistent +
0.65 cm6.5 mm <br />0.0065 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
Flowering Jul–Aug(–Sep). +
connate +  and distinct +
5 +  and 13 +
Gen. N. Amer. Pl. +
flat;convex +
1 +  and 9 +
exalbuminous +
hairy +  and glabrous +
appendaged +  and truncate +
papillate +
Lactuca hirsuta var. albiflora +  and Lactuca hirsuta var. sanguinea +
Lactuca hirsuta +
species +
80 cm800 mm <br />0.8 m <br /> (120 cm1,200 mm <br />1.2 m <br />) +
15 cm150 mm <br />0.15 m <br /> (80 cm800 mm <br />0.8 m <br />) +
shrub +  and subshrub +