Flora of North America species comparison

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Tephroseris palustris

marsh fleabane, marsh woolly-groundsel, swamp ragwort
Habit Annuals or biennials (perhaps rarely perennials), 20–100 cm (loosely arachnose or villous, hairs white, light yellowish, or reddish brown, indument fugitive in some populations; caudices fibrous-rooted).
Stems

single.
Leaves

basal and cauline (basal and proximal sometimes withering before flowering, mid-stem leaves prominent at flowering);

petioles weakly defined;

blades oblanceolate to linear-oblanceolate or spatulate, 5–15 × 0.5–3(–5) cm, margins subentire to coarsely dentate or subpinnatifid (distal leaves bractlike).
Involucres

± abruptly contracted to peduncles.
Ray florets

(13–)21+;

corolla laminae 5–9+ mm (sometimes incompletely opened, appearing tubular).
Disc florets

30–50;

corollas yellow.
Phyllaries

usually 21, green or yellowish green (tips sometimes pinkish), 4–10 mm.
Heads

(4–)6–20(–40+), in loose to crowded, corymbiform arrays.
Cypselae

glabrous;

pappi white or dirty white.
2n

= 48.

Tephroseris palustris
Phenology Flowering May–Sep.
Habitat Wet soils, shorelines, pond margins, brackish habitats
Elevation 0–1000 m (0–3300 ft)
Distribution
from FNA
AK; IA; MI; MN; ND; SD; WI; AB; BC; LB; MB; NT; NU; ON; QC; SK; YT; Eurasia
[WildflowerSearch map]
[BONAP county map]
Discussion

Tephroseris palustris varies greatly in stature and in distribution and persistence of tomentum. The variations have been used to distinguish infraspecific taxa or two species; contemporary thought is that the complex is best treated as a single, polymorphic species.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 20, p. 616.
Parent taxa Asteraceae > tribe Senecioneae > Tephroseris
Sibling taxa
T. frigida, T. kjellmanii, T. lindstroemii, T. tundricola, T. yukonensis
Synonyms Othonna palustris, Senecio arcticus, Senecio congestus, Senecio congestus var. laceratus, Senecio congestus var. palustris, Senecio congestus var. tonsus, Senecio tubicaulis, T. palustris subsp. congesta
Name authority (Linnaeus) Reichenbach: Fl. Saxon., 146. (1842)
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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