Isocoma menziesii
Isocoma humilis
coastal goldenbush, Menzies' goldenbush, Pacific jimmyweed, white flower goldenbush
Zion goldenbush, Zion jimmyweed
glabrous or villlous, sometimes stipitate-glandular, not resinous.
villosulous or tomentose to sparsely hispidulous (hairs short, crisped, white), not resinous.
blades obovate to spatulate or oblanceolate to nearly linear, 5–40 mm, margins entire or toothed to lobed.
blades narrowly oblanceolate, 5–10(–18) mm, margins usually toothed or lobed (teeth or shallow lobes in 1–2(–3), pinnately arranged pairs), sometimes entire.
(6–)7–9 × 6–8 mm.
5–6 × 6–7 mm.
(15–)18–25(–28);
corollas 5–7 mm.
19–28;
corollas 4–5 mm.
apices green to yellowish, not aristate, sometimes with weakly developed, non- or weakly spinulose projection, gland-dotted, without resin pockets or pockets small, weakly developed (var. decumbens and var. menziesii).
apices greenish, not aristate, gland-dotted, without resin pockets.
ribs not forming apical horns.
ribs not forming apical horns.
Isocoma menziesii
Isocoma humilis
Varieties 5 (5 in the flora).
(Discussion copyrighted by Flora of North America; reprinted with permission.)
Of conservation concern.
Isocoma humilis is known only from Washington County. It is recognized by its low stature (mostly 4–8 cm) and rounded habit, villosulous vestiture, small, toothed leaves, relatively large, many-flowered heads borne singly or in pairs, and small corollas and cypselae.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
1. Leaf blades mostly obovate, thick-fleshy, margins coarsely serrate; stems decumbent, prostrate, or pendent; herbage glabrous | var. sedoides |
1. Leaf blades obovate to oblanceolate, usually not thick-fleshy, margins entire or toothed (if so then at least stems densely villous); stems erect to ascending or decumbent; herbage glabrous, villous, tomentose, or stipitate-glandular | → 2 |
2. Herbage essentially glabrous, stipitate-glandular | → 3 |
2. Herbage glabrous, villous, or tomentose, not prominently glandular or glands beneath other vestiture | → 4 |
3. Stems prostrate to decumbent or ± erect; leaves 5–22 × 2–4 mm; heads in corymbiform to loose, paniculiform arrays; cypselae 2.3–3.6 mm; San Diego County southward | var. decumbens |
3. Stems strictly erect; leaves 20–40 × 4–10 mm; heads in corymbiform arrays; cypselae (3.8–)4.5–5 mm; San Benito and Santa Clara counties | var. diabolica |
4. Plants densely tomentose or villous | → 5 |
4. Plants glabrous or glabrate | → 6 |
5. Herbage finely and closely grayish-arachnoid-tomentose; leaf blades narrowly oblanceolate, 5–22 × 2–4 mm, margins entire or with 1–2 pairs of teeth distally | var. decumbens |
5. Herbage hirtellous, villoso-pilose, or densely gray-tomentose (hairs flattened, vitreous, long); leaf blades linear to oblanceolate or spatulate-oblong, 10–40 × 2–6(–9) mm, at least proximal leaves with toothed margins | var. vernonioides |
6. Leaf margins entire or with 1–2 pairs of teeth or shallow lobes distally | var. menziesii |
6. At least proximal leaves toothed along most margins | var. vernonioides |
CA
WildflowerSearch
iNaturalist
USDA Plants Database
