WorldFloraDB - Helianthus petiolaris

Characteristics

Annuals, 40–200 cm. Stems erect, usually densely canescent, hispid, or strigillose, rarely ± hirsute or glabrate. Leaves mostly cauline; mostly alternate; petioles 2–4 cm; blades (often bluish green) lanceolate to deltate-ovate or ovate, 4–15 × 1–8 cm, bases subcordate or truncate to cuneate, margins entire or ± serrate, abaxial faces strigose, sparsely to densely, or not at all, gland-dotted. Heads 1–5. Peduncles 4–15(–40) cm. Involucres ± hemispheric, 10–24 mm diam. Phyllaries 14–25, lance-linear to lanceolate to lance-ovate, 10–14 × 1–4(–5) mm, (margins sometimes ciliate) apices short-attenuate, abaxial faces usually hispidulous, rarely sparsely hirsute to glabrate. Paleae 4.5–7.5 mm, 3-toothed, middle teeth ± ciliate or bearded, hairs whitish, 0.5–0.7 mm. Ray florets 10–30; laminae 15–20 mm. Disc florets 50–100+; corollas 4.5–6 mm, lobes usually reddish, rarely yellow; anthers reddish to purplish, appendages purplish (style branches reddish). Cypselae 3–4.5 mm, ± villous; pappi of 2 aristate scales 1.5–3 mm plus 0–2 erose scales 0.3–0.5 mm. 2n = 34.

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Similar to H. annuus, but smaller, seldom over 1 m, with narrower, more often entire, rarely cordate lvs, which may be more densely hairy beneath, and with smaller heads, the disk 1–2.5 cm wide; invol bracts lanceolate or lance-ovate, tapering gradually to the tip, shortly scabrous-hispid, seldom at all ciliate or with any long hairs; central receptacular bracts conspicuously white-bearded at the tip; 2n=34. Prairies, plains, and waste places, especially in sandy soil; native mainly on the Great Plains and in sw. U.S., but occasionally eastward as a weed. June–Sept. Ours is var. petiolaris

An annual plant. It has a taproot. It grows 1.8 m tall. The leaves are more narrow than ordinary sunflower. The leaves are less than 10 cm wide.

Life form

annual

Growth form

herb

Growth support

free-standing

Foliage retention

deciduous

Sexuality

hermaphrodite

Pollination

entomogamy

Spread

-

Mature width (meter)

-

Mature height (meter)

3.0

Root system

tap-root

Rooting depth (meter)

-

Root diameter (meter)

0.3

Flower color

Blooming months

Jan	Feb	Mar
Apr	May	Jun
Jul	Aug	Sep
Oct	Nov	Dec

Fruit color

-

Fruiting months

-

Nitrogen fixer

-

Photosynthetic pathway

c3

Environment

Sandy soils. Dry prairies. Dry open areas, usually sandy soils at elevations of 10-1500 metres.

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It is a temperate plant. In Canada it grows on dry prairie and uncultivated land.

Light
Soil humidity
Soil texture
Soil acidity
Soil nutriment	-
Hardiness (USDA)

Usage

Uses	fodder gene source medicinal
Edible	seeds
Therapeutic use	Hunting Medicine (flower), Dermatological Aid (leaf), Dermatological Aid (unspecified), Other (unspecified), Panacea (unspecified)
Human toxicity	-
Animal toxicity	-

Cultivation

Can be grown by seedlings.

Mode	seedlings
Germination duration (days)	10 - 14
Germination temperacture (C°)	-
Germination luminosity	-
Germination treatment	-
Minimum temperature (C°)	-
Optimum temperature (C°)	-
Size	-
Vigor	-
Productivity	-