Senecio linearifolius A.Rich.

Fireweed groundsel (en)

Species

Angiosperms > Asterales > Asteraceae > Senecio

Characteristics

Erect perennial herb, 40-100 cm tall. Stems sparsely to moderately hairy when young, soon almost or quite glabrous, branched above to form infl. Lower and mid cauline lvs sparsely hairy on upper surface and moderately to densely lanate on lower when young, becoming almost glabrous on upper surface but usually remaining hairy on lower, apetiolate, not lobed, linear to lanceolate, usually entire and involute, rarely remotely denticulate, acuminate, cuneate at base and sometimes with a few teeth, 60-120 × 3-8-(12) mm; venation pinnate. Uppermost lvs smaller. Capitula in dense panicles. Supplementary bracts (2)-5-7-(10), lanceolate, 1-2 mm long. Involucral bracts 9-13, narrow-oblong, glabrous, 3-4 mm long. Ray florets 5-6; ligules yellow, 3-5 mm long. Disc yellow. Achenes somewhat flattened, sparsely to moderately hairy, 1.2-1.4 mm long; pappus 5-6 mm long.
More
Subshrubs to c. 2 m high, sometimes glaucous, nearly glabrous or leaves and peduncles sometimes hairy. Leaves to c. 20 cm long, with l:w ratio c. 1.5–40, undivided; base attenuate, or cuneate to cordate, sometimes with basal lobes, mostly hardly stem-clasping; margin entire, denticulate or dentate; upper surface nearly glabrous or sparsely appressed-cottony; lower surface glabrous, cobwebby, sparsely hispid, or woolly; venation variably distinct. Capitula numerous to 100s per stem; calycular bracteoles 2–6, 1.5–3 mm long; involucre 2.5–5.5 mm long, 1.5–3.0 mm diam.; bracts 7–12 (–14), glabrous or slightly cobwebby. Florets 12–30; ligulate florets 4–8 (–9), with ligules 3–8 mm long. Achenes narrowly obloid, 1.3–2.5 mm long, glabrous or with papillose hairs in bands or somewhat scattered. Pappus 4–6 mm long.
Life form perennial
Growth form
Growth support -
Foliage retention evergreen
Sexuality -
Pollination -
Spread -
Mature width (meter) -
Mature height (meter) 1.2 - 1.5
Root system -
Rooting depth (meter) -
Root diameter (meter) -
Flower color -
Blooming months
JanFebMar
AprMayJun
JulAugSep
OctNovDec
Fruit color -
Fruiting months -
Nitrogen fixer -
Photosynthetic pathway c3

Environment

Light -
Soil humidity -
Soil texture -
Soil acidity -
Soil nutriment -
Hardiness (USDA) 7-11

Usage

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

Cultivation

Mode -
Germination duration (days) 10 - 21
Germination temperacture (C°) 18 - 23
Germination luminosity light
Germination treatment -
Minimum temperature (C°) -
Optimum temperature (C°) -
Size -
Vigor -
Productivity -

Images

Senecio linearifolius unspecified picture

Distribution

Senecio linearifolius world distribution map, present in Australia, New Zealand, and United States of America

Identifiers

LSID urn:lsid:ipni.org:names:246077-1
WFO ID wfo-0000098179
COL ID 4WLPT
BDTFX ID -
INPN ID -
Wikipedia (EN) Link
Wikipedia (FR)

Synonyms

Senecio linearifolius Senecio linearifolius var. linearifolius