Boltonia asteroides

(Linnaeus) L’Héritier

Sert. Angl., 27. 1789

Common names: White doll’s-daisy asterlike boltonia
Basionyms: Matricaria asteroides Linnaeus Mant. Pl., 116. 1767
Treatment appears in FNA Volume 20. Treatment on page 355. Mentioned on page 357.
Plants 30–200 mm; stoloniferous. Stems erect. Leaf blades linear or lanceolate to oblanceolate; cauline 20–220 × 2–30 mm, bases not decurrent. Heads usually in corymbiform, sometimes paniculiform arrays, branches spreading to ascending, most bracts leaflike, 15–120 × 2–18 mm. Peduncles 5–220 mm; bracts 0–15, linear to subulate or ovate to oblanceolate, 2–12(–62) mm. Involucres 3–5 × 4–14 mm. Phyllaries in 3–5 series, subulate, linear, lanceolate, or spatulate, subequal, 0–6 merging down peduncles; outer 1.5–3.8 × 0.4–1.6 mm; inner 2.1–4 × 0.3–1.5. Ray florets 20–60; corollas white to lilac, laminae 5–13 mm, tubes 0.5–1.7 mm. Disc florets 65–170; corollas 1.5–2.6 mm. Cypselae obovoid, 1–3 × 0.8–2 mm, wings 0.1–0.5 mm wide; pappi awns 0.4–2 mm (lengths ± 2/3 cypselae).

Discussion

Varieties 3 (3 in the flora).

Variety asteroides is restricted to the coastal plain province. Varieties latisquama and recognita occur in the central lowland province and in the highland provinces between it and the coastal plain; var. recognita is also disjunct in Idaho and Oregon.

Selected References

None.

Key

1 Phyllaries linear to linear-attenuate or subulate, apices acute; pappus awn lengths to 2/3 cypselae Boltonia asteroides var. asteroides
1 Phyllaries spatulate, oblanceolate, or linear-oblanceolate, apices cuspidate; pappus awn lengths 2/3 + cypselae > 2
2 Phyllaries spatulate to obovate-spatulate, membranaceous margins broad, (2–)2.5–6 mm wide Boltonia asteroides var. latisquama
2 Phyllaries, oblanceolate to linear-oblanceolate, membranaceous margins ± narrow, 1–2.5(–3) mm wide Boltonia asteroides var. recognita