WorldFloraDB - Helianthus pauciflorus

Characteristics

Perennials, 50–200 cm (rhizomatous). Stems erect, scabro-hispid. Leaves mostly basal; opposite, or opposite (proximal) and alternate; petioles 0–1 cm; blades lance-ovate to oblong-lanceolate, or rhombic-ovate to lance-linear, 5–27 × 2–6 cm, bases cuneate, margins serrate to subentire, abaxial faces sparsely hispid, sparsely, if at all, gland-dotted (cauline smaller). Heads 1–10. Peduncles 3–12 cm. Involucres hemispheric, 15–23 mm diam. Phyllaries 25–35, ovate, 6–10 × 3–5 mm, (margins ciliate) apices acute, abaxial faces glabrate to hispid. Paleae 9–10 mm, shallowly 3-toothed to subentire (apices ciliate, hairy). Ray florets 10–20; laminae 20–35 mm (abaxial faces usually gland-dotted). Disc florets 75+; corollas 6.5–7 mm, lobes usually reddish, sometimes yellow ; anthers dark, appendages dark (style branches yellow). Cypselae 5–6 mm, glabrate; pappi of 2 aristate scales 4.5–5 mm plus 1–4 smaller aristate scales 0.3–2 mm. 2n = 102 (subspecies unknown).

More

Perennial with long rhizomes; stems scabrous or hispid to subglabrous, ± naked above, the heads long-pedunculate; lvs nearly all opposite, to 15 pairs below the infl, scabrous to shortly hispid on both sides, mostly (2–)2.5–8 times as long as wide, mostly trinerved, toothed or entire, tapering to a short petiole or petiolar base, the middle ones seldom much smaller than the lowest ones present at anthesis; disk red-purple, 1.5–2.5(–3) cm wide; invol bracts evidently imbricate, broad, firm, appressed, mostly ovate or broadly lanceolate, sharply acute to obtuse, conspicuously ciliolate, otherwise generally glabrous; rays 10–21, 1.5–3(–3.5) cm; pappus nearly always with some short scales in addition to the 2 longer awns; 2n=102. Prairies and roadsides; Mich. and Ind. to Alta., N.M., and Tex., and e. occasionally to Mass. and N.B. Aug., Sept. Two vars.:

Life form

perennial

Growth form

herb

Growth support

free-standing

Foliage retention

deciduous

Sexuality

hermaphrodite

Pollination

-

Spread

-

Mature width (meter)

-

Mature height (meter)

0.9 - 1.65

Root system

rhizome

Rooting depth (meter)

1.3

Root diameter (meter)

0.4

Flower color

Blooming months

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

Fruit color

-

Fruiting months

-

Nitrogen fixer

-

Photosynthetic pathway

c3

Environment

Light
Soil humidity
Soil texture
Soil acidity	-
Soil nutriment	-
Hardiness (USDA)

Usage

Uses	environmental use gene source
Edible	seeds stems
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	-