Bidens beckii Torr. ex Spreng.

Beck's water-marigold (en)

Species

Angiosperms > Asterales > Asteraceae > Bidens

Characteristics

Perennials (perhaps flowering first year) to 200+ cm (aquatics). Leaves sessile; submersed blades multifid (2–3+-pinnatisect), ultimate lobes filiform, mostly 0.1–0.3 mm diam.; aerial blades ovate to lanceolate, 10–45+ × 5–20+ mm, bases cuneate, margins pectinately incised to serrate or entire, not ciliate, apices obtuse to acuminate or attenuate, faces glabrous. Heads usually borne singly. Peduncles (10–)20–100 mm. Calyculi of 5–6 usually spreading, oblong to obovate bractlets 5–8 mm, margins entire, not ciliate, abaxial faces usually glabrous. Involucres ± hemispheric, 7–12 × 12–15 mm. Phyllaries 7–8+, ovate, 7–10 mm. Ray florets 8; laminae yellow, 10–15 mm. Disc florets 10–30+; corollas pale yellow, 5–6 mm. Cypselae (outer and inner ± alike) yellowish to greenish brown, nearly terete or weakly 4-angled, ± linear, 10–15 mm, margins not barbed or ciliate, apices truncate, faces smooth or ± striate, glabrous; pappi of 2(–6) divergent to patent, retrorsely barbed (on distal 1/4 or so) awns 13–25(–40) mm. 2n = 26.
Life form perennial
Growth form herb
Growth support free-standing
Foliage retention deciduous
Sexuality hermaphrodite
Pollination -
Spread -
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Flower color
Blooming months
JanFebMar
AprMayJun
JulAugSep
OctNovDec
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Environment

Light 7-9
Soil humidity 5-7
Soil texture 3-4
Soil acidity -
Soil nutriment -
Hardiness (USDA) 4-9

Usage

Uses medicinal
Edible -
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Human toxicity -
Animal toxicity -

Cultivation

Mode -
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Images

Bidens beckii unspecified picture

Distribution

Bidens beckii world distribution map, present in Canada and United States of America

Conservation status

Bidens beckii threat status: Least Concern

Identifiers

LSID urn:lsid:ipni.org:names:32319-2
WFO ID wfo-0000045262
COL ID LS4B
BDTFX ID -
INPN ID -
Wikipedia (EN) Link
Wikipedia (FR)

Synonyms

Bidens beckii f. beckii Bidens beckii Megalodonta beckii Megalodonta remota Megalodonta nudata Megalodonta beckii var. oregonensis Megalodonta beckii var. beckii Megalodonta beckii var. hendersonii