Author

Mason Piehler

Capitula/heads

Radiate
Involucres hemispheric; 3–5 × 4–14 mm. 
Phyllaries in 3–5 series, subulate, linear, lanceolate, or spatulate, subequal, 0–6 occurring down peduncles; 1.5–4 × 0.3–1.6 mm.
Receptacles conic to hemispheric, +/- pitted

Common Name(s)

White doll’s daisy; asterlike boltonia

Disk Flowers

Disc florets 50–160, bisexual, fertile; corollas yellow, tubes shorter than funnelform throats, lobes 5, erect, triangular; style-branch appendages deltoid.

Ecology

Occurs in areas with wet soil such as marshes, wet prairies, roadsides, wet pine savannas, riverbanks, flood plains, often somewhat shaded; 0–400 m.

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Family

Asteraceae (Compositae); Aster family

Fruit

Achenes (cypselae) dimorphic (brownish)
Ray ± triquetrous, margins narrowly winged, ribs 2 abaxial, 1 adaxial 
Disc obovoid, 1–3 × 0.8–2 mm, laterally compressed, margins with wings 0.1–0.5 mm wide, resin ducts present, faces often puberulent; 
Pappus persistent, usually of 2–3 stiff awns plus (0–)7–12 shorter, intermediate bristles or scales in 1 series.

Leaves

Alternate, simple,
basal withering by flowering;
cauline sessile; blades 1-nerved, linear, subulate to lanceolate or oblanceolate, bases attenuate, cauline sometimes decurrent on stem, margins entire to serrulate with callous-tipped teeth, apices acute to acuminate, faces glabrous.

Plant and Stem Features

Perennial, stoloniferous, 30–200 mm; stems erect to ascending, branched distally, often ribbed, glabrous.

Ray Flowers

Ray florets 20–60, pistillate, fertile; corollas white to lilac, laminae linear to elliptic, laminae 5–13 mm long, tubes 0.5–1.7 mm.

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References

Conquist, A. 1980. Vascular Flora of the Southeastern United States, Vol. I, Asteraceae. The University of North Carolina Press, Chapel Hill.

Godfrey, R. K. and J. W. Wooten. 1981. Aquatic and Wetland Plants ofSoutheastern United States, Dicotyledons. University of Georgia Press, Athens.

Karman-Castro, V. and L. E. Urbatsch.  2006. Boltonia  L’Héritier. In: Flora North American North of Mexico. Edited by Flora North America editorial committee. Vol 20. Oxford University Press, New York and Oxford.

USDA, NRCS. 2006. The PLANTS Database (http://plants.usda.gov, 4 December 2006). National Plant Data Center, Baton Rouge, LA 70874-4490 USA.

Synonyms

Boltonia asteroides var. glastifolia (Hill) Fernald

B. glastifolia (Hill) L’Héritier

Matricaria asteroides Linnaeus