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

1. Dieteria asteroides Torrey in W. H. Emory, Not. Milit. Reconn. 141. 1848.

Machaeranthera asteroides (Torrey) Greene

Biennials or short-lived perennials. Stems, branches, and peduncles usually hairy, puberulent, or canescent, often sparsely stipitate-glandular (glabrous or densely stipitate-glandular in var. glandulosa). Leaf blades lanceolate to oblanceolate, mid 20–100 × (2–)6–20 mm, margins entire to irregularly serrate, faces puberulent or canescent, often sparsely short-stipitate-glandular (densely, stiffly long-stipitate-glandular in var. glandulosa); distal bases cordate to auriculate, clasping. Involucres broadly turbinate to hemispheric. Phyllaries in 5–12 series, spreading to reflexed, apices acute to long-acuminate, 1–6 mm, herbaceous, faces puberulent or canescent throughout (on both indurate bases and foliaceous apices), sometimes sparsely stipitate-glandular (moderately to densely stipitate-glandular in var. glandulosa). Receptacles 3.5–7 mm diam. Ray florets pistillate, fertile; laminae white to purple, 10–20 × 0.8–1.5 mm. Disc corollas 5–8 mm. Cypselae glabrous or moderately appressed-hairy.

Varieties 3 (3 in the flora): sw United States; Mexico.

1 Stems glabrous or stipitate-glandular; leaves stiffly stipitate-glandular   1b Dieteria asteroides var. glandulosa
+ Stems hairy, puberulent, or canescent, sometimes sparsely stipitate-glandular; leaves puberulent or canescent, sometimes sparsely stipitate-glandular   (2)
2 (1) Mid leaf blades 6–20 mm wide, margins usually serrate or serrulate; involucres hemispheric; phyllary apices long-acuminate, 3–6 mm   1a Dieteria asteroides var. asteroides
+ Mid leaf blades 2–6 mm wide, margins entire or slightly serrulate; involucres usually broadly turbinate, rarely hemispheric; phyllary apices acute to acuminate, 1–3 mm   1c Dieteria asteroides var. lagunensis


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