Helianthus ciliaris

de Candolle in A. P. de Candolle and A. L. P. P. de Candolle

in A. P. de Candolle and A. L. P. P. de Candolle, Prodr. 5: 587. 1836.

Common names: Blueweed blueweed sunflower Texas blueweed
Treatment appears in FNA Volume 21. Treatment on page 169. Mentioned on page 144, 168.

Perennials, 40–70 cm (rhizomatous or with creeping roots, often forming extensive colonies). Stems decumbent to ± erect, glabrous or glabrate (glaucous). Leaves cauline; mostly opposite; sessile; blades (often bluish green, 1-nerved or 3-nerved) linear to lanceolate, 3–7.5 × 0.5–2.2 cm, bases ± cuneate, margins entire or serrate (usually ciliate and undulate), faces glabrous or glabrate to hispid. Heads 1–5. Peduncles (1–) 3–13 cm. Involucres hemispheric, 12–25 mm diam. Phyllaries 16–19, ovate to lanceovate, 3–8 × 2–3.5 mm, (margins ciliate) apices obtuse to acute, abaxial faces glabrate to ± strigose, not glanddotted. Paleae 7–7.5 mm, subentire to 3-toothed (apices obtuse to acute, hairy, glanddotted). Ray-florets 10–18; laminae 8–9 mm. Disc-florets 35+; corollas 4–6 mm, lobes reddish; anthers brownish red, appendages brownish red (style-branches yellow). Cypselae 3–3.5 mm, glabrous; pappi of 2 aristate scales 1.2–1.5 mm. 2n = 68, 102.


Phenology: Flowering summer–fall.
Habitat: Roadsides, ditches, cultivated fields, open drainage areas
Elevation: 10–2600 m

Distribution

V21-412-distribution-map.gif

Ariz., Calif., Colo., Ill., Kans., Nebr., Nev., N.Mex., Okla., Tex., Utah, Mexico (Chihuahua), Mexico (Coahuila), Mexico (Durango), Mexico (San Luis Potosí), Mexico (Sonora), Mexico (Tamaulipas)

Discussion

Helianthus ciliaris is considered a noxious weed in some states. It can propagate vegetatively from detached pieces of rhizome and spread aggressively, especially in cultivated fields. It has been noted to occur in Idaho and Washington, where control measures have been taken to eliminate it.

Selected References

None.

Lower Taxa

None.
... more about "Helianthus ciliaris"
glabrate +  and more or less strigose +
not tailed +, rounded +  and obtuse +
brownish red +
pale +  and dark +
connate +  and distinct +
subequal +
scarious +
usually ovate +  and lanceolate +
usually deltate +  and lanceolate +
spiciform +, paniculiform +  and corymbiform +
indeterminate +  and determinate +
Edward E. Schilling +
de Candolle in A. P. de Candolle and A. L. P. P. de Candolle +
cuneate +
3 cm30 mm <br />0.03 m <br /> (7.5 cm75 mm <br />0.075 m <br />) +
linear;lanceolate +
0.5cm;2.2cm +
winged;ribbed;winged;ribbed +
tuberculate +  and rugose +
barbellulate +  and barbellate +
Blueweed +, blueweed sunflower +  and Texas blueweed +
reddish +  and yellow +
0.4 cm4 mm <br />0.004 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
compressed +  and obpyramidal +
fertile +  and bisexual +
fertile +  and bisexual +
Ariz. +, Calif. +, Colo. +, Ill. +, Kans. +, Nebr. +, Nev. +, N.Mex. +, Okla. +, Tex. +, Utah +, Mexico (Chihuahua) +, Mexico (Coahuila) +, Mexico (Durango) +, Mexico (San Luis Potosí) +, Mexico (Sonora) +  and Mexico (Tamaulipas) +
10–2600 m +
glabrate +  and hispid +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Roadsides, ditches, cultivated fields, open drainage areas +
in more or less corymbiform , paniculiform or spiciform , arrays +  and singly +
indeterminate +
homogamous +  and heterogamous +
each +  and sessile +
1.2 cm12 mm <br />0.012 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
hemispheric +
0.8 cm8 mm <br />0.008 m <br /> (0.9 cm9 mm <br />0.009 m <br />) +
triangular +
serrate +  and entire +
2-carpellate +
subentire;3-toothed +
0.7 cm7 mm <br />0.007 m <br /> (0.75 cm7.5 mm <br />0.0075 m <br />) +
persistent +
coroniform +
1 cm10 mm <br />0.01 m <br /> (3 cm30 mm <br />0.03 m <br />) +
3 cm30 mm <br />0.03 m <br /> (13 cm130 mm <br />0.13 m <br />) +
Flowering summer–fall. +
0.3 cm3 mm <br />0.003 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
16 +  and 19 +
0.2 cm2 mm <br />0.002 m <br /> (0.35 cm3.5 mm <br />0.0035 m <br />) +
in A. P. de Candolle and A. L. P. P. de Candolle, Prodr. +
bearing subulate enations +, hairy +  and bristly +
flat;slightly convex +
aristate +
0.12 cm1.2 mm <br />0.0012 m <br /> (0.15 cm1.5 mm <br />0.0015 m <br />) +
exalbuminous +
procumbent +  and decumbent +
decumbent +  and more or less erect +
appendaged +  and truncate +
hirsutulous +  and glabrous +
papillate +
Undefined (tribe Undefined) subtribe Lagasceinae +
Helianthus ciliaris +
Helianthus +
species +
campanulate +
toothed +  and entire +
300 cm3,000 mm <br />3 m <br /> (500 cm5,000 mm <br />5 m <br />) +
40 cm400 mm <br />0.4 m <br /> (70 cm700 mm <br />0.7 m <br />) +
shrub +  and subshrub +