WorldFloraDB - Helianthus divaricatus

Characteristics

Perennials, 20–150 cm (rhizomatous) . Stems erect, usually glabrous , rarely ± hairy (often glaucous). Leaves cauline; opposite; sessile; blades (light to dark green, sometimes whitish abaxially, 3-nerved at bases) lanceolate to lance-ovate, 6–15 × 1–5 cm, bases rounded to cordate, margins subentire to serrate, abaxial faces sparsely hispid to hispidulous, gland-dotted. Heads 1–10. Peduncles 0.5–9 cm. Involucres hemispheric, 10–15 mm diam. Phyllaries 18–25, lanceolate, lance-linear, or lance-ovate, 6–12 × 2–2.5 mm, (margins ciliate) apices acuminate to attenuate, abaxial faces hispidulous to glabrate, not gland-dotted. Paleae 5–8 mm, 3-toothed (apices ciliate). Ray florets 8–12; laminae 15–30 mm. Disc florets 40+; corollas 4.2–5.5 mm, lobes yellow; anthers usually dark brown to black, appendages yellow. Cypselae 3–3.6 mm, glabrate; pappi of 2 aristate scales 2.2–2.5 mm. 2n = 34.

More

Fibrous-rooted perennial from long rhizomes; stems 0.5–1.5 m, glabrous below the infl, often glaucous; lvs all opposite, sessile or rarely on a short petiole to 5 mm, scabrous above, loosely hirsute or hispidulous (at least on the main veins) beneath, narrowly lanceolate to broadly lance-ovate, 5–18 × 1–5(–8) cm, broadest near the truncate or broadly rounded base, tapering to the slender, acuminate tip, shallowly toothed or subentire, trinerved near the base; heads 1–several at the tips of stiff cymose branches; disk yellow, 1–1.5 cm wide; invol bracts lance-acuminate or-attenuate, ciliolate, rather loose, often with reflexed tip; rays 8–15, 1.5–3 cm; 2n=34. Abundant in dry woods and other open places; widespread in e. U.S. and adj. Can., from Mass. and N.H. to Wis., s. to Fla., La., and e. Okla. July–Sept.

Life form

perennial

Growth form

herb

Growth support

free-standing

Foliage retention

deciduous

Sexuality

hermaphrodite

Pollination

-

Spread

-

Mature width (meter)

-

Mature height (meter)

0.2 - 1.5

Root system

fibrous-root rhizome

Rooting depth (meter)

-

Root diameter (meter)

-

Flower color

Blooming months

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

Fruit color

-

Fruiting months

-

Nitrogen fixer

-

Photosynthetic pathway

-

Environment

Light
Soil humidity
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	-