Isocoma menziesii
Isocoma acradenia
coastal goldenbush, Menzies' goldenbush, Pacific jimmyweed, white flower goldenbush
alkali goldenbush, alkali jimmyweed
glabrous or villlous, sometimes stipitate-glandular, not resinous.
usually glabrous, sometimes minutely hispidulous, often stipitate-glandular, often resinous.
blades obovate to spatulate or oblanceolate to nearly linear, 5–40 mm, margins entire or toothed to lobed.
blades oblanceolate to narrowly obovate, 20–150 mm, margins entire or toothed or lobed (teeth or lobes apically rounded-obtuse).
(6–)7–9 × 6–8 mm.
5–8 × 5–7 mm.
(15–)18–25(–28);
corollas 5–7 mm.
12–27;
corollas 5–7(–8) 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 yellowish to greenish yellow, sometimes spinulose-aristate, usually not gland-dotted, usually with single, strongly developed, subepidermal resin pocket nearly as wide as bracts, sometimes a central pocket and 2+ smaller, lateral ones (resin pockets sometimes formed from numerous, coalesced, sessile glands).
ribs not forming apical horns.
ribs not forming apical horns.
Isocoma menziesii
Isocoma acradenia
Varieties 5 (5 in the flora).
(Discussion copyrighted by Flora of North America; reprinted with permission.)
isocoma acradenia is distinctive in its whitish stems and narrow, whitish-indurate phyllaries with an apical resin pocket (or pockets). the leaves often occur in axillary fascicles
Varieties 3 (3 in the flora).
(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 |
1. Leaves 50–150 mm; florets 20–27; phyllaryapices spinulose-aristate | var. bracteosa |
1. Leaves 20–50 mm; florets 12–24; phyllary apices usually rounded, not spinulose, sometimes with weakly developed aristae | → 2 |
2. Leaves usually entire, proximal rarely toothed or lobed | var. acradenia |
2. Leaves all toothed to pinnatifid | var. eremophila |
CA
WildflowerSearch
iNaturalist
USDA Plants Database
