Senecio integerrimus
Senecio sheldonensis
lambstongue ragwort, mountain butterweed, one-stem butterweed, tall western groundsel, western groundsel
Mount Sheldon butterweed, Mount Sheldon ragwort, Mt. Sheldon ragwort
arachnose, loosely tomentose, or villous (hairs crisped, jointed), glabrescent.
glabrous or with scattered hairs near leaf bases and among heads.
single.
single or loosely clustered.
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).
evenly distributed; petiolate or subsessile;
blades lanceolate, 4–10 × 2–4 cm, bases ± tapered, margins denticulate (distal leaves sessile, smaller).
usually ± 8 or ± 13, sometimes 0;
corolla laminae 6–15(–20) mm (usually yellow, ochroleucous to white in one variety).
± 8;
corolla laminae ± 10 mm.
usually ± 13 or ± 21, rarely ± 8, (4–)5–12(–15) mm, tips usually black, sometimes green.
± 13, 7–10 mm, tips black (hairy).
of 1–5+ linear to filiform bractlets (seldom more than 2 mm).
of 3–7 bractlets (0.5–3 mm).
6–20(–40+) in corymbiform arrays (peduncle of terminal head often shorter than others).
(1–)3–5(–6) in cymiform arrays.
usually glabrous, sometimes hirtellous (mostly on angles).
glabrous.
= 40, 80.
Senecio integerrimus
Senecio sheldonensis
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.)
Senecio sheldonensis is infrequently collected and poorly understood. The treatment here is provisional.
(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
