189. Boltonia L’Héritier, Sert. Angl. 27. 1789.
Doll’s-daisy [For James Bolton, fl. 1750s–1799, English botanist, artist]
Vesna Karaman-Castro, Lowell E. Urbatsch
Perennials, 30–200+ cm (rhizomatous, stoloniferous, or with basal offshoots). Stems erect to ascending, branched distally (ribbed), glabrous. Leaves basal (withering by flowering) and cauline; alternate; sessile (sometimes decurrent); blades 1-nerved, linear, subulate to lanceolate or oblanceolate (bases attenuate, cauline sometimes decurrent), margins entire to serrulate (teeth callous-tipped), (apices acute to acuminate) faces glabrous. Heads radiate , (10–100+) in leafy, corymbiform or paniculiform arrays. ( Peduncles bracteate or ebracteate, bracts leaflike or scalelike .) Involucres hemispheric, (2–5 ×) 3–14 mm. Phyllaries 30–55 in 3–6 series, 1-nerved (midribs thickened, resinous; flat), linear to oblanceolate or spatulate, unequal to subequal, margins ± membranaceous, faces glabrous. Receptacles conic to hemispheric, obscurely pitted, epaleate. Ray florets 20–60, pistillate, fertile; corollas white to lilac (laminae linear to elliptic). Disc florets 50–400+, bisexual, fertile; corollas yellow, tubes shorter than funnelform throats, lobes 5, erect, triangular; style-branch appendages deltate. Cypselae dimorphic (brownish); ray ± triquetrous, margins arrowly winged, ribs 2 abaxial, 1 adaxial; disc obovoid to cuneate or obcordiform, laterally compressed, margins winged or not, resin ducts present, faces often puberulent; pappi persistent, usually of 2–3 sclerified awns plus (0–)7–12 shorter bristles or scales in 1 series. x = 9.
Species 5 (5 in the flora): North America.
Morgan, J. T. 1966. A Taxonomic Study of the Genus Boltonia (Asteraceae). Ph.D. dissertation. University of North Carolina.