Flora of North America species comparison

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Isocoma menziesii

coastal goldenbush, Menzies' goldenbush, Pacific jimmyweed, white flower goldenbush
Herbage

glabrous or villlous, sometimes stipitate-glandular, not resinous.
Leaf

blades obovate to spatulate or oblanceolate to nearly linear, 5–40 mm, margins entire or toothed to lobed.
Involucres

(6–)7–9 × 6–8 mm.
Florets

(15–)18–25(–28);

corollas 5–7 mm.
Phyllary

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).
Cypsela

ribs not forming apical horns.

Isocoma menziesii
Distribution
from FNA
CA; nw Mexico
[WildflowerSearch map]
[BONAP county map]
Discussion

Varieties 5 (5 in the flora).

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Key
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
Source FNA vol. 20, p. 442.
Parent taxa Asteraceae > tribe Astereae > Isocoma
Sibling taxa
I. acradenia, I. arguta, I. azteca, I. coronopifolia, I. drummondii, I. humilis, I. pluriflora, I. rusbyi, I. tenuisecta
Subordinate taxa
I. menziesii var. decumbens, I. menziesii var. diabolica, I. menziesii var. menziesii, I. menziesii var. sedoides, I. menziesii var. vernonioides
Synonyms Pyrrocoma menziesii
Name authority (Hooker & Arnott) G. L. Nesom: Phytologia 70: 93. (1991)
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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