Lactuca virosa
Sp. Pl. 2: 795. 1753.
Introduced
Biennials, 20–120 (–200+) cm. Leaves on proximal 1/2–2/3 of each stem; blades of undivided cauline leaves obovate to spatulate, margins denticulate, midribs usually prickly-setose. Heads in paniculiform arrays. Involucres 12–15 mm. Phyllaries usually reflexed in fruit. Florets 10–15; corollas yellow, usually deliquescent. Cypselae: bodies purplish to blackish, ± flattened, ± elliptic, 3.5–4 mm, beaks ± filiform, 2.5–3.5 mm, faces 5–7-nerved; pappi white, 5–6 mm. 2n = 18.
Phenology: Flowering May, Oct.
Habitat: Disturbed sites
Elevation: 10–400 m
Distribution
Introduced; Ala., Calif., D.C., Europe
Discussion
Selected References
None.
Lower Taxa
None.
"fine" is not a number.
... more about "Lactuca virosa"
tailed +
introrse +
connate +
obtuse;acute +
scarious +
developed +
absent +
hirsute +
papillate +
paniculiform +
persistent +
falling +
continuous +
decurrent +
stout +
filiform +
lanceolate;oblanceolate linear or filiform +
winged +
ribbed +
elliptic +
flattened +
3;10 +
deltate;lanceolate +
filiform +
stigmatic +
white +
80;120 +
coarse +
equal +
absent +
undivided +
deliquescent +
yellow +
subtending +
equal +
monomorphic +
straight +
5-7-nerved +
glabrous +
rugulose +
distinct +
ligulate +
proximal +
10;15 +
bisexual +
dispersed +
subsessile +
indeterminate +
homogamous +
true +
surrounding +
campanulate;cylindric +
alternate +
prickly +
denticulate +
scarious +
prickly-setose +
2-carpellate +
inferior +
attached +
anatropous +
white +
persistent +
minute +
bracteate +
inflated +
tough +
thick +
connate +
persistent +
reflexed +
subequal +
equal +
Sp. Pl. +
1753 +
epaleate +
glabrous +
pitted +
flat;convex +
fibrous +
exalbuminous +
modifed +
2;3 +
Introduced +
alternate +
branched +
erect +
2-branched +
hirsute +
papillate +
Lactuca virosa +
Lactuca +
species +
taprooted +
biennial +