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.

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 +