Helianthus pumilus Nutt.

Little sunflower (en)

Species

Angiosperms > Asterales > Asteraceae > Helianthus

Characteristics

Perennials, 30–100 cm (taproots slightly thickened). Stems erect, hispid or strigose. Leaves cauline; opposite; petioles 0.4–3 cm; blades (ashy green, usually 3-nerved from bases) lanceolate to ovate, 4–15 × 1–5 cm, bases ± cuneate to truncate, margins entire or serrate, faces strigoso-hispid, gland-dotted. Heads 1–6. Peduncles 0.5–5.5 cm. Involucres cylindric, 7–14 mm diam. Phyllaries 15–25 (loosely appressed), lanceolate to ovate, 3.5–7.5 × 2–3.5 mm, apices acute to acuminate, abaxial faces ± hispid or strigose (hairs whitish), gland-dotted. Paleae 7–8 mm, entire or ± 3-toothed (apices acute to acuminate, hispid). Ray florets 8–13; laminae 15–20 mm (abaxial faces gland-dotted). Disc florets 30+: corollas 5–6 mm, lobes yellow; anthers dark brown to black, appendages dark. Cypselae 3–4 mm, sparsely hairy; pappi of 2 aristate scales 4–4.5 mm plus 0–4 deltate scales 0.5–1 mm. 2n = 34.
Life form perennial
Growth form herb
Growth support free-standing
Foliage retention deciduous
Sexuality hermaphrodite
Pollination -
Spread -
Mature width (meter) -
Mature height (meter) 0.3 - 1.0
Root system tap-root
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 -
Soil nutriment -
Hardiness (USDA) 4-9

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 -

Images

Habit

Helianthus pumilus habit picture by Jack Pommer (cc-by-sa)

Leaf

Helianthus pumilus leaf picture by Jack Pommer (cc-by-sa)
Helianthus pumilus leaf picture by Jack Pommer (cc-by-sa)

Flower

Helianthus pumilus flower picture by Jack Pommer (cc-by-sa)
Helianthus pumilus flower picture by Jack Pommer (cc-by-sa)

Distribution

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

Identifiers

LSID urn:lsid:ipni.org:names:329265-2
WFO ID wfo-0000059371
COL ID 3K5ZR
BDTFX ID -
INPN ID -
Wikipedia (EN) Link
Wikipedia (FR)

Synonyms

Helianthus pumilus Helianthus pumilus var. pumilus