Helianthus ciliaris

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- 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 lance-ovate, 3–8 × 2–3.5 mm, (margins ciliate) apices obtuse to acute, abaxial faces glabrate to ± strigose, not gland-dotted. Paleae 7–7.5 mm, subentire to 3-toothed (apices obtuse to acute, hairy, gland-dotted). 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



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


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


Lower Taxa

... more about "Helianthus ciliaris"
Edward E. Schilling +
de Candolle +
Blueweed +, blueweed sunflower +  and Texas blueweed +
Ariz. +, Calif. +, Colo. +, Ill. +, Kans. +, Nebr. +, Nev. +, N.Mex. +, Okla. +, Tex. +, Utah +, Mexico (Chihuahua +, Coahuila +, Durango +, San Luis Potosí +, Sonora +  and Tamaulipas). +
10–2600 m +
Roadsides, ditches, cultivated fields, open drainage areas +
Flowering summer–fall. +
in A. P. de Candolle and A. L. P. P. de Candolle, Prodr. +
Undefined (tribe Undefined) subtribe Lagasceinae +
Helianthus ciliaris +
Helianthus +
species +