Senecio integerrimus
Senecio californicus
lambstongue ragwort, mountain butterweed, one-stem butterweed, tall western groundsel, western groundsel
California butterweed, California ragwort
arachnose, loosely tomentose, or villous (hairs crisped, jointed), glabrescent.
glabrous or sparsely tomentose.
single.
usually single (erect), sometimes 2–6 (branching from bases, arching upward).
progressively reduced distally; ± petiolate;
blades elliptic, lanceolate, linear, oblanceolate, rounded-deltate, or suborbiculate, 6–25 × 1–6 cm, bases ± tapered or truncate to cordate, margins entire or ± dentate (distal leaves sessile, bractlike).
(sometimes subsucculent) evenly distributed; ± petiolate (proximal);
blades linear-lanceolate to lanceolate 2–5(–7+) × 0.5–2(–3+) cm, bases tapered, margins subpinnatifid to dentate or subentire (mid and distal leaves sessile, bases clasping).
usually ± 8 or ± 13, sometimes 0;
corolla laminae 6–15(–20) mm (usually yellow, ochroleucous to white in one variety).
± 13;
corolla laminae 8–11 mm.
usually ± 13 or ± 21, rarely ± 8, (4–)5–12(–15) mm, tips usually black, sometimes green.
± 21 (sometimes fewer), 5–7(–8) mm, tips black.
of 1–5+ linear to filiform bractlets (seldom more than 2 mm).
of 5–8+ lanceolate to lance-linear or filiform bractlets (0.5–3 mm, usually inconspicuous).
6–20(–40+) in corymbiform arrays (peduncle of terminal head often shorter than others).
usually 3–10(–20+) in open, cymiform arrays, sometimes borne singly (depauperate plants).
usually glabrous, sometimes hirtellous (mostly on angles).
hirtellous-strigose.
= 40, 80.
= 40.
Senecio integerrimus
Senecio californicus
Varieties 5 (5 in the flora).
The varieties of Senecio integerrimus are distinguished by morphology and geography.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
Dwarfish, subsucculent plants of Senecio californicus from near the coast have been recognized as S. ammophilus.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
1. Basal leaves with distinct petioles, blades usually ovate to rounded-deltate, sometimes obovate to oblanceolate; ray corollas white or ochroleucous | var. ochroleucus |
1. Basal leaves with or without distinct petioles, blades elliptic, lanceolate, oblanceolate, rounded-deltate, sublinear, or suborbiculate; ray corollas yellow (or rays 0) | → 2 |
2. Herbage glabrous or glabrate at flowering (except in leaf axils and among heads); phyllaries linear-subulate, tips usually green, minutely (if at all) black | var. integerrimus |
2. Herbage usually arachnose, tomentose, or villous at flowering; phyllaries lanceolate to linear-subulate, tips black (if minutely so, then narrowly lanceolate and broader than subulate) | → 3 |
3. Basal and proximal leaves oblong or lanceolate to sublinear; heads 3–6(–16+); phyllaries 10–15+ mm | var. scribneri |
3. Basal and proximal leaves mostly elliptic to oblanceolate, sometimes elliptic or rounded-deltate to suborbiculate; heads usually 6–15(–30+; if fewer than 6, leaves lanceolate or broader); phyllaries 5–12 mm. | → 4 |
4. Plants copiously arachnose, tomentose, or villous at flowering; phyllaries linear-subulate, 8–12 mm, tips minutely, if at all, blackened | var. major |
4. Plants copiously to sparsely arachnose, tomentose, or villous at flowering; phyllaries mostly lanceolate (seldom as narrow as linear-subulate), 5–10 mm, tips black | var. exaltatus |
- Local floras:
BC, 
CA, 
OR, 
WA - Local Web sites: CalFlora, CalPhotos,
Flora NW, 
KS Wildflowers, 
MN Wildflowers, 
PNW Herbaria, Turner Photog. 
WildflowerSearch
iNaturalist (observations)
USDA Plants Database- LBJ Wildflower Center
- SEINet
- Plants of the World Online
- Encyclopedia of Life
- Wikipedia
- Google Image Search
