WorldFloraDB - Helianthus mollis

Characteristics

Perennials, 50–150+ cm (rhizoma-tous). Stems erect, hirsute to villous. Leaves mostly cauline; mostly opposite (sometimes alternate among heads); sessile; blades (ashy or gray-green, 3-nerved distal to bases) lance-olate to broadly ovate, 5.5–14.5 × 1.8–6.5 cm, bases rounded to cordate, margins entire or serrulate, abaxial faces hispid to tomentose, gland-dotted. Heads 1–15. Peduncles 0.1–15 cm. Involucres broadly hemispheric, 12–25 mm diam. Phyllaries 30–40, lanceolate, (5–)10–16 × 2–3.5 mm, apices usually acute, sometimes acuminate, abaxial faces densely hispid to villous or tomentose, densely gland-dotted. Paleae (oblanceolate) 9–11 mm, entire (1-toothed, densely hairy, densely gland-dotted). Ray florets 17–22; laminae 25–30 mm (abaxial faces densely gland-dotted). Disc florets 75+; corollas 6–7.5 mm, lobes yellow; anthers dark, appendages dark. Cypselae 3.5–4 mm, distally villous; pappi of 2 aristate scales 2.8–3.2 mm. 2n = 34.

More

Perennial from stout rhizomes, usually colonial, 0.5–1(–1.2) m, densely and softly hairy throughout; lvs sessile, subcordate, ascending, broadly lanceolate to broadly ovate or oblong, 6–15 × 2–8 cm, 1.4–3(–4) times as long as wide, serrulate or entire; uppermost lvs sometimes alternate; heads few or solitary; disk yellow, 2–3 cm wide; invol bracts slightly imbricate, lanceolate, acuminate, often finally glandular as well as densely white-hairy, the upper part loose or spreading; rays mostly 16–35, 1.5–3.5 cm; 2n=34. Prairies and other dry places; chiefly Ozarkian and midwestern, from O. to Wis., s. Io., and e. Kans. s. to Ga. and Tex., and occasionally intr. e. to the Atlantic. July–Sept. A probable hybrid with H. giganteus has been named H. doronicoides Lam.

Life form	perennial
Growth form	herb
Growth support	free-standing
Foliage retention	deciduous
Sexuality	hermaphrodite
Pollination	-
Spread	-
Mature width (meter)	-
Mature height (meter)	-
Root system	rhizome
Rooting depth (meter)	-
Root diameter (meter)	0.5
Flower color	-
Blooming months	-
Fruit color	-
Fruiting months	-
Nitrogen fixer	-
Photosynthetic pathway	-

Environment

Light	-
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Soil acidity
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Hardiness (USDA)

Usage

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

Cultivation

Mode	-
Germination duration (days)	47 - 49
Germination temperacture (C°)	-5 - 3
Germination luminosity	-
Germination treatment	-
Minimum temperature (C°)	-
Optimum temperature (C°)	-
Size	-
Vigor	-
Productivity	-