Laënnecia coulteri

coulteri (A. Gray) G. L. Nesom

Phytologia 68: 217. 1990.

Basionym: Conyza coulteri A. Gray Proc. Amer. Acad. Arts 7: 355. 1868
Treatment appears in FNA Volume 20. Treatment on page 38. Mentioned on page 37.

Annuals, 10–150 cm. Leaf-blades: bases ± clasping, faces usually both hirtellous to villous and ± glandular-viscid; proximal broadly spatulate to oblong, 20–50 × 10–20 mm, obscurely lobed or coarsely toothed; distal oblong to elliptic, 10–20 × 3–10 mm, coarsely toothed from near bases or entire. Heads in racemiform-paniculiform arrays. Involucres 2.5–3+ mm. Receptacles 2–3 mm diam. Pistillate florets 60–100+; corollas: lengths ± 1/2 styles, laminae 0. Disc-florets 5–20. Cypselae pale tan, 0.5–1 mm, glabrous or sparsely strigillose (hairs 0.05–0.1 mm), sometimes stipitate or sessile-glandular; pappi fragile or readily falling, of 10–30 whitish bristles in 1 series, (2.5–) 3.5–4 mm. 2n = 18.


Phenology: Flowering year round, mostly fall.
Habitat: Stream banks, roadsides, other disturbed sites, clays or sands, often alkaline soils
Elevation: -60–1800 m

Distribution

V20-42-distribution-map.gif

Ariz., Calif., Colo., Nev., N.Mex., Tex., Utah, Mexico

Discussion

J. M. Kingsbury (1964) reported Laënnecia coulteri (as Conyza coulteri) to be toxic to livestock.

Selected References

None.

Lower Taxa

None.
... more about "Laënnecia coulteri"
not tailed +, rounded +  and obtuse +
distinct +
subequal +
scarious +
usually triangular +  and linear +
usually deltate +  and lanceolate +
racemiform-paniculiform +
indeterminate +  and determinate +
John L. Strother +
coulteri (A. Gray) G. L. Nesom +
decurrent +
Conyza coulteri +
compound +  and simple +
lobed;spatulate;ovate;obovate;oblong;oblanceolate +
rugulose +  and muricate +
not 2-lipped +  and actinomorphic +
sessile-glandular +  and stipitate +
beaked +, 2-ribbed +  and 5-ribbed +
strigillose +  and glabrous +
compressed +, oblong +  and elliptic or obovate +
fertile +  and bisexual +
fertile +  and bisexual +
Ariz. +, Calif. +, Colo. +, Nev. +, N.Mex. +, Tex. +, Utah +  and Mexico +
-60–1800 m +
sessile-glandular +  and stipitate +
glandular-viscid +
hirtellous +  and villous +
winged +  and beaked +
dispersed +
Stream banks, roadsides, other disturbed sites, clays or sands, often alkaline soils +
disciform +  and radiate +
indeterminate +
heterogamous +  and homogamous +
each +  and sessile +
0.2 cm2 mm <br />0.002 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
1 cm10 mm <br />0.01 m <br /> (2 cm20 mm <br />0.02 m <br />) +
toothed;oblong;elliptic +
petiolate +  and sessile +
cauline +  and basal +
spreading;erect +
deltate +
sessile-glandular +  and stipitate +
villous +, tomentose +, hirtellous +  and glabrate +
membranous +
2-carpellate +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.35 cm3.5 mm <br />0.0035 m <br />) +
persistent +
0.35 cm3.5 mm <br />0.0035 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
Flowering year round, mostly fall. +
lanceolate +  and linear +
less unequal +  and subequal +
styliferous +, neuter +  and pistillate +
bearing subulate enations +, hairy +  and bristly +
concave;usually flat;conic +
exalbuminous +
branched +  and simple +
appendaged +  and truncate +
papillate +  and smooth +
Compositae +
Laënnecia coulteri +
Laënnecia +
species +
entire +  and toothed +
120 cm1,200 mm <br />1.2 m <br /> (350 cm3,500 mm <br />3.5 m <br />) +
10 cm100 mm <br />0.1 m <br /> (150 cm1,500 mm <br />1.5 m <br />) +
tree +, shrub +  and subshrub +