Isocoma menziesii
Isocoma azteca
coastal goldenbush, Menzies' goldenbush, Pacific jimmyweed, white flower goldenbush
Apache jimmyweed, Aztec goldenbush
glabrous or villlous, sometimes stipitate-glandular, not resinous.
glabrous, sometimes sparsely stipitate-glandular, not resinous.
blades obovate to spatulate or oblanceolate to nearly linear, 5–40 mm, margins entire or toothed to lobed.
blades narrowly oblong to narrowly oblanceolate, 20–50 mm, margins shallowly to deeply pinnatifid (lobes in 3–8 evenly arranged pairs, apically aristate).
(6–)7–9 × 6–8 mm.
7–8 × 5–7.5 mm.
(15–)18–25(–28);
corollas 5–7 mm.
18–25;
corollas 5–6 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 green to greenish yellow, not aristate, sparsely to prominently gland-dotted, without resin pockets.
ribs not forming apical horns.
ribs not forming apical hornlike extensions.
Isocoma menziesii
Isocoma azteca
Varieties 5 (5 in the flora).
(Discussion copyrighted by Flora of North America; reprinted with permission.)
Isocoma azteca is similar to I. rusbyi in most features and perhaps most closely related to it; the pinnate leaves of I. azteca are distinctive. The two taxa are essentially contiguous in range along the New Mexico-Arizona border and their interaction in natural populations needs to be studied.
(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
