Boltonia

L’Héritier

Sert. Angl., 27. 1789.

Common names: Doll’s-daisy
Etymology: For James Bolton, fl. 1750s–1799, English botanist, artist
Treatment appears in FNA Volume 20. Treatment on page 353. Mentioned on page 17.
 TaxonIllustrator 
FNA20 P38 Aphanostephus ramosissimus.jpegAphanostephus ramosissimus var. ramosissimus
Boltonia apalachicolensis
Barbara Alongi
Barbara Alongi

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.

Discussion

Species 5 (5 in the flora).

Key

1 Disc cypselae lacking wings, or if present wings 0.01–0.1 mm wide; pappus awns 0–0.4 mm > 2
1 Disc cypselae wings 0.1–0.5 mm wide; pappus awns (0.3–)0.4–2 mm > 3
2 Heads in corymbiform arrays; outer phyllaries 1.7–2.8 mm; ray laminae 5–13 mm Boltonia asteroides
2 Heads in paniculiform arrays; outer phyllaries 1.2–1.6 mm; ray laminae 3–7.5 mm Boltonia caroliniana
3 Bases of cauline leaves decurrent; rhizomes and stolons absent; Illinois, Missouri Boltonia decurrens
3 Bases of cauline leaves not decurrent; rhizomes or stolons present or absent; widely distributed or not in Illinois or Missouri. > 4
4 Heads in paniculiform arrays, primary branches mostly spreading; only proximal bracts leaflike, 8–55 mm, others reduced and linear to linear-oblanceolate or subulate, 2–10(–15) mm Boltonia diffusa
4 Heads in corymbiform arrays, branches spreading to ascending; most bracts leaflike, 10–120 mm, only peduncle bracts reduced, linear to subulate or ovate to linear-oblanceolate, 1–12(–62) mm > 5
5 Pappus awns 0.3–0.8 mm; outer phyllaries 1.3–2 mm; ray laminae 5–9 mm; Florida panhandle to se Louisiana Boltonia apalachicolensis
5 Pappus awns 0.4–2 mm; outer phyllaries 1.5–3.8 mm; ray laminae 5–13 mm; e North America, Idaho, Oregon Boltonia asteroides

"[" is not declared as a valid unit of measurement for this property."]" is not declared as a valid unit of measurement for this property.

... more about "Boltonia"
not tailed +, rounded +  and obtuse +
distinct +
subequal +
scarious +
usually triangular +  and linear +
usually deltate +  and lanceolate +
paniculiform +, corymbiform +  and leafy +
indeterminate +  and determinate +
Vesna Karaman-Castro +  and Lowell E. Urbatsch +
L’Héritier +
7 +  and 12 +
decurrent +
subulate;lanceolate or oblanceolate +
rugulose +  and muricate +
barbellulate +  and barbellate +
Doll’s-daisy +
not 2-lipped +  and actinomorphic +
yellow +, white +  and lilac +
beaked +, 2-ribbed +  and 5-ribbed +
compressed +, less columnar +  and prismatic +
fertile +  and bisexual +
fertile +  and bisexual +
compressed;obovoid;cuneate or obcordiform +
North America +
For James Bolton, fl. 1750s–1799, English botanist, artist +
puberulent +  and glabrous +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
indeterminate +
heterogamous +  and homogamous +
each +  and sessile +
hemispheric +
cauline +  and basal +
triangular +
not +  and winged +
entire +  and serrulate +
2-carpellate +
persistent +
linear +  and oblanceolate or spatulate +
unequal +  and subequal +
Sert. Angl., +
triquetrous +
bearing subulate enations +, hairy +  and bristly +
conic;hemispheric +
morgan1966a +
adaxial +  and abaxial +
1 +  and 2 +
exalbuminous +
erect +  and ascending +
appendaged +  and truncate +
papillate +  and smooth +
Compositae +
Boltonia +
Asteraceae tribe Astereae +
30 cm300 mm <br />0.3 m <br /> (200 cm2,000 mm <br />2 m <br />) +
tree +, shrub +  and subshrub +