Isocoma menziesii
Phytologia 70: 93. 1991.
Common names: Pacific jimmyweed Menzies’ goldenbush
Basionym: Pyrrocoma menziesii Hooker & Arnott Bot. Beechey Voy., 351. 1838
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. 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). Florets (15–)18–25(–28); corollas 5–7 mm. Cypsela ribs not forming apical horns.
Distribution
Calif., nw Mexico.
Discussion
Varieties 5 (5 in the flora).
Selected References
None.
Lower Taxa
Key
| 1 | Leaf blades mostly obovate, thick-fleshy, margins coarsely serrate; stems decumbent, prostrate, or pendent; herbage glabrous | Isocoma menziesii 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 | Isocoma menziesii 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 | Isocoma menziesii 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 | Isocoma menziesii 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 | Isocoma menziesii var. vernonioides |
| 6 | Leaf margins entire or with 1–2 pairs of teeth or shallow lobes distally | Isocoma menziesii var. menziesii |
| 6 | At least proximal leaves toothed along most margins | Isocoma menziesii var. vernonioides |