Helianthus bolanderi A.Gray

Serpentine sunflower (en)

Species

Angiosperms > Asterales > Asteraceae > Helianthus

Characteristics

Annuals, 60–150 cm. Stems erect, hispid to hirsute. Leaves mostly cauline; mostly alternate; petioles 1–4 cm; blades lance-linear or lance-ovate to ovate, 3–15 × 2–6 cm, bases cuneate to truncate, margins usually serrate, abaxial faces sparsely hirsute, gland-dotted . Heads 1–3. Peduncles 3–13 cm. Involucres hemispheric, 17–25 mm diam. Phyllaries 10–18, usually lanceolate to lance-ovate, 9–27 × (3–)3.5–5 mm (often surpassing discs), apices gradually attenuate, abaxial faces hirsute. Paleae 9.5–10.5 mm, 3-toothed (middle teeth subulate, surpassing discs, apices glabrous). Ray florets 12–17; laminae 14–20 mm. Disc florets 75+ (discs usually 2+ cm diam.); corollas 5–7 mm, lobes usually reddish; anthers dark, appendages dark (style branches reddish). Cypselae 3.5–4.5 mm, glabrate; pappi of 2 lanceolate scales 1.7–3 mm. 2n = 34.
Life form annual
Growth form herb
Growth support free-standing
Foliage retention deciduous
Sexuality hermaphrodite
Pollination -
Spread -
Mature width (meter) 1.0 - 1.5
Mature height (meter) 1.05 - 2.0
Root system -
Rooting depth (meter) -
Root diameter (meter) -
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 4-8
Soil nutriment -
Hardiness (USDA) 9-10

Usage

Uses gene source
Edible -
Therapeutic use -
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 -

Images

Helianthus bolanderi unspecified picture

Distribution

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

Conservation status

Helianthus bolanderi threat status: Least Concern

Identifiers

LSID urn:lsid:ipni.org:names:329238-2
WFO ID wfo-0000090532
COL ID 6LHP9
BDTFX ID -
INPN ID -
Wikipedia (EN) Link
Wikipedia (FR)

Synonyms

Helianthus bolanderi Helianthus scaberrimus