Helianthus gracilentus A.Gray

Slender sunflower (en)

Species

Angiosperms > Asterales > Asteraceae > Helianthus

Characteristics

Perennials, 60–200 cm (taprooted). Stems (reddish or purplish) erect, hairy. Leaves cauline; all or mostly opposite; petioles 0–3 cm; blades (1-or 3-nerved) lanceolate to lance-ovate, 5–11 × 2–3.5 cm, bases cuneate, margins entire or serrate, abaxial faces hispid, gland-dotted. Heads 1–5. Peduncles 2.5–30 cm. Involucres hemispheric, 13–20 mm diam. Phyllaries 20–25, lanceolate, 4–8 × 1.5–3 mm, (margins ciliate) apices acute, abaxial faces hispidulous, gland-dotted. Paleae 8–9 mm, subentire to weakly 3-toothed (apices acute, ciliate, gland-dotted). Ray florets 13–21; laminae 15–25 mm (abaxial faces gland-dotted). Disc florets 50+; corollas 5–6 mm, lobes reddish; anthers reddish brown, appendages yellow or dull orange (style branches yellow ). Cypselae 3–4 mm, glabrate; pappi of 2 aristate scales 2.5–3 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) 0.6 - 2.0
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) -

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

Helianthus gracilentus unspecified picture

Distribution

Helianthus gracilentus world distribution map, present in Mexico and United States of America

Identifiers

LSID urn:lsid:ipni.org:names:329264-2
WFO ID wfo-0000119126
COL ID 3K5WJ
BDTFX ID -
INPN ID -
Wikipedia (EN) Link
Wikipedia (FR)

Synonyms

Helianthus gracilentus