1	Leaf blades mostly obovate, thick-fleshy, margins coarsely serrate; stems decumbent, prostrate, or pendent; herbage glabrous		3d Isocoma menziesii var. sedoides
+	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 (1)	Herbage essentially glabrous, stipitate-glandular		(3)
+	Herbage glabrous, villous, or tomentose, not prominently glandular or glands beneath other vestiture		(4)
3 (2)	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		3a Isocoma menziesii var. decumbens (in part)
+	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		3b Isocoma menziesii var. diabolica
4 (2)	Plants densely tomentose or villous		(5)
+	Plants glabrous or glabrate		(6)
5 (4)	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		3a Isocoma menziesii var. decumbens (in part)
+	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		3e Isocoma menziesii var. vernonioides (in part)
6 (4)	Leaf margins entire or with 1–2 pairs of teeth or shallow lobes distally		3c Isocoma menziesii var. menziesii
+	At least proximal leaves toothed along most margins		3e Isocoma menziesii var. vernonioides (in part)