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FNA | Family List | FNA Vol. 20 | Asteraceae | Isocoma

3e. Isocoma menziesii (Hooker & Arnott) G. L. Nesom var. vernonioides (Nuttall) G. L. Nesom, Phytologia. 70: 101. 1991.

Isocoma vernonioides Nuttall, Trans. Amer. Philos. Soc., n. s. 7: 320. 1840; Haplopappus venetus (Kunth) S. F. Blake subsp. vernonioides (Nuttall) H. M. Hall; Isocoma veneta (Kunth) Greene var. vernonioides (Nuttall) Jepson

Stems erect to ascending or decumbent; herbage hirtellous or villoso-pilose or densely gray-tomentose (hairs flattened, vitreous, long) to glabrate, sometimes stipitate-glandular. Leaf blades linear to oblanceolate or spatulate-oblong, 10–40 × 2–6(–9) mm, not thick-fleshy, margins of at least the proximal pinnately lobed or shallowly toothed. Heads in corymbiform arrays. Corollas 5–7 mm. Cypselae 2.3–3.6 mm. 2n = 24.

Flowering (Apr–)Jul–Dec. Coastal bluffs and dunes, sandy flats, salt marsh borders, occasionally on dry slopes; of conservation concern; 5–400 m; Calif.; Mexico (Baja California).

In San Diego and Riverside counties, plants of var. vernonioides produce small leaves that are often nearly glabrous, perhaps reflecting the influence of genes from var. menziesii.


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