Senecio squalidus
Senecio amplectens
oxford ragwort
alpine groundsel, showy alpine ragwort
sparsely, unevenly floccose to subglabrous, glabrescent.
(often purplish-tinged) glabrous or sparsely and unevenly hairy, especially near leaf axils and among heads, usually glabrescent.
single (branching distally).
single or loosely clustered.
evenly distributed;
petiolate (proximal, petioles ± winged);
blades obovate to oblong, 4–10 × 2–4+ cm, mostly lyrate-pinnatifid to pinnate, bases tapered, ultimate margins dentate (distal leaves similar, smaller, sessile).
usually progressively reduced distally (basal sometimes smaller than proximal or mid leaves);
petiolate (petioles shorter than to equaling blades, often clasping);
blades broadly lanceolate or lanceolate to oblanceolate, (5–)10–20+ × 2–4(–5+) cm, bases tapered, margins dentate to denticulate (distal leaves smaller, bractlike).
± 13;
corolla laminae 5–8 mm.
usually ± 13, sometimes fewer;
corolla laminae (10–)15–25 mm.
(± 13) ± 21, 5–6+ mm, tips black.
± 13 or ± 21, tips often black or brownish (sometimes with scattered black hairs).
of 4–10+ bractlets (1–2+ mm).
of 2–5+ linear to filiform bractlets (lengths to 1/2 phyllaries).
(3–)6–20 in open, cymiform arrays.
nodding, 1–5(–10).
usually hairy.
glabrous.
= 20.
= 40, ca. 175–180.
Senecio squalidus
Senecio amplectens
Senecio squalidus is native in Europe, where it is a common weed. It is apparently established in the San Francisco Bay area, California and has been reported from British Columbia, New Brunswick, and Nova Scotia. It is to be expected elsewhere.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
Varieties 2 (2 in the flora).
The varieties of Senecio amplectens are distinguished by morphologic tendencies and habitat preferences; there are many intermediates. Where the ranges of the two overlap, var. amplectens occurs at slightly lower elevations than var. holmii.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
1. Plants (30–)40–60+; herbage sometimes sparsely hairy; leaves mostly proximal and mid cauline; phyllaries frequently black or purplish toward tips, sometimes with black hairs on abaxial faces | var. amplectens |
1. Plants (5–)10–20(–30) cm; herbage glabrous or glabrate at flowering; leaves mostly basal and proximal; phyllaries green or light purplish, glabrous | var. holmii |
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USDA Plants Database
CalFlora
PNW Herbaria
