Helianthus neglectus Heiser

Neglected sunflower (en)

Species

Angiosperms > Asterales > Asteraceae > Helianthus

Characteristics

Annuals, 80–200 cm. Stems erect (leafy), ± hispid to glabrate. Leaves cauline; alternate; petioles 7–12 cm; blades deltate-ovate, 7–14 × 7.5–12.3 cm, bases usually ± cordate, sometimes truncate , margins subentire to serrulate, abaxial faces strigose, not gland-dotted. Heads 1–5. Peduncles 10–40 cm. Involucres ± hemispheric, (23–28 ×) 10–14 mm. Phyllaries 25–35, lanceolate, 14–25 × 2.3–4 mm (surpassing discs), apices long-attenuate, abaxial faces strigillose to hispid. Paleae 9–10 mm, 3-toothed (middle teeth ± ciliate or bearded, hairs whitish, 0.3–0.6 mm). Ray florets 21–31; laminae 29–39 mm. Disc florets 150+; corollas 6–6.5 mm, lobes reddish; anthers dark, appendages purplish (style branches reddish). Cypselae 4–5 mm, strigillose to glabrate ; pappi of 2 aristate scales 2.8–3.2 mm. 2n = 34.
Life form annual
Growth form herb
Growth support free-standing
Foliage retention deciduous
Sexuality hermaphrodite
Pollination -
Spread -
Mature width (meter) -
Mature height (meter) 0.8 - 2.0
Root system -
Rooting depth (meter) -
Root diameter (meter) 0.4
Flower color
Blooming months
JanFebMar
AprMayJun
JulAugSep
OctNovDec
Fruit color -
Fruiting months -
Nitrogen fixer -
Photosynthetic pathway -

Environment

Light 7-9
Soil humidity 3-7
Soil texture -
Soil acidity -
Soil nutriment -
Hardiness (USDA) -

Usage

Uses gene source
Edible -
Therapeutic use -
Human toxicity -
Animal toxicity -

Cultivation

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

Distribution

Helianthus neglectus world distribution map, present in United States of America

Identifiers

LSID urn:lsid:ipni.org:names:119185-2
WFO ID wfo-0000138361
COL ID 3K5YP
BDTFX ID -
INPN ID -
Wikipedia (EN) Link
Wikipedia (FR)

Synonyms

Helianthus neglectus