Symphyotrichum drummondii

(Lindley) G. L. Nesom

Phytologia 77: 279. 1995.

Common names: Drummond’s aster
Basionym: Aster drummondii Lindley Compan. Bot. Mag. 1: 97. 1835
Synonyms: Aster sagittifolius var. drummondii (Lindley) Shinners
Treatment appears in FNA Volume 20. Treatment on page 503. Mentioned on page 474, 500, 502, 505, 506, 508, 509.

Perennials, 30–120 cm, cespitose; short-rhizomatous or with stout, often woody caudices. Stems 1–5+, erect (straight, stout), glabrate or glabrescent, sparsely pilose, or hirsuto-pilose proximally, ± densely so distally. Leaves (abaxially pale or grayish green, adaxially dark green) initially ± firm or membranous, becoming thicker, margins crenate-serrate to serrate, strigoso-ciliate to scabrous, apices acuminate to acute, mucronate, abaxial faces scabrous to densely piloso-strigose, more so on veins, adaxial scabrous to glabrate; basal withering by flowering, long-petiolate (petioles narrowly winged, sheathing, sometimes ciliate), blades ovate to ovate-oblong or lanceolate to elliptic or suborbiculate, 10–85 (–100) × 8–60 mm, bases deeply cordate to rounded or abruptly attenuate, margins crenate-serrate, apices usually rounded to obtuse, rarely acute; proximal cauline often withering by flowering, long-petiolate (petioles narrowly winged, more broadly so distally, ciliate), blades ovate or ovatelanceolate, (25–) 50–120 (–150) × (15–) 20–50 (–65) mm, progressively to slightly reduced distally, bases deeply to shallowly cordate or rounded, margins crenate-serrate to sharply serrate; distal petiolate or subpetiolate or sessile, petioles broadly winged, blades ovate to ovate or oblong-lanceolate, to oblongelliptic or linear-lanceolate (4–) 5–110 × 1–50 mm, reduced distally (sharply so on array branches in var. texanum), bases shallowly cordate or rounded to attenuate or cuneate (distally), margins crenate-serrate or serrulate or entire. Heads in open, paniculiform arrays, branches ascending to divaricate, often densely racemiform or ± paniculiform (lateral ones open, racemiform) to subsecund, ± stiff to lax, long to relatively short, ± closely to ± remotely leafy, branch leaves progressively or ± abruptly reduced distally. Peduncles 0, or 0.2–1.5 (–4) cm, densely ascending or appressed-bracteate, pilosulous, bracts 4–17+, lanceolate or subulate to linear-oblanceolate, distally grading into phyllaries, pilosulous or strigoso-ciliate. Involucres campanulate, (3.5–) 4.5–6 (–6.5) mm. Phyllaries in 4–5 series, subulate or lanceolate (outermost) to narrowly oblong-lanceolate, unequal, bases indurate 1/4–3/4, margins narrowly scarious proximally, hyaline, ciliate, bodies sometimes green to margins distally, green zones lanceolate to linear-lanceolate, apices acute to acuminate or long-acuminate, tips often purple, sometimes involute, mucronulate, faces glabrous. Ray-florets (8–) 10–15 (—20); corollas usually bright blue to purple or lavender, sometimes white, laminae (5–) 7–10 (–12) × 1–1.8 mm. Disc-florets (10–) 13–15 (–22); corollas cream to yellow, becoming deep purple or reddish purple, 3.5–4.5 (–5) mm, tubes shorter than funnelform to cylindric throats, lobes triangular to lanceolate, 0.4–0.7 mm. Cypselae dull purple or brown to tan (ribs tan to stramineous), obovoid, ± compressed, (1.5–) 2–3 mm, 5–6-nerved, faces glabrate to sparsely strigillose distally; pappi cream to rose-tinged, 3–4 mm.

Distribution

V20-1125-distribution-map.gif

Ala., Ark., Ga., Ill., Ind., Iowa, Kans., Ky., La., Md., Mich., Minn., Miss., Mo., Nebr., Ohio, Okla., Pa., Tenn., Tex., W.Va., Wis., ne Mexico

Discussion

Varieties 2 (2 in the flora).

Variety texanum is tetraploid; var. drummondii is both diploid and tetraploid. The tetraploid race of var. drummondii is most likely autopolyploid; origin of var. texanum has not been determined. The two taxa intergrade and do not appear to warrant species status.

Selected References

None.

Key

1 Plants 40–120 cm; stems proximally sparsely hirsute, distally densely so; leaves firm, basal and proximal long-petiolate, petioles ± winged, proximal bases ± cordate or truncate, sometimes obliquely; heads in ample, paniculiform arrays with divaricate or ascending, bracteate, often racemiform branches; peduncles ± secund, 0–4 cm, bracteate; involucres campanulate, (3.5–)4.5–7 mm; ray corollas usually bright blue, light purple, bluish violet, or lavender, sometimes white; cypselae glabrous Symphyotrichum drummondii var. drummondii
1 Plants 30–80 cm; stems ± densely hirsute, particularly distally; leaves membranous, becoming thickish, brittle, basal and proximal winged-petiolate, proximal bases cordate, becoming rounded-truncate distally; heads in open, paniculiform arrays with very long, widely spreading branches; peduncles 1–4 cm, densely, minutely bracteate; involucres turbinate to hemispheric, 3.8–5.2 mm; ray corollas bluish white; cypselae strigillose Symphyotrichum drummondii var. texanum

"thicker" is not a number.

... more about "Symphyotrichum drummondii"
scabrous +  and densely piloso-strigose +
scabrous +  and glabrate +
not tailed +, rounded +  and obtuse +
long-petiolate +
8.5 cm85 mm <br />0.085 m <br /> (10 cm100 mm <br />0.1 m <br />) +
distinct +
1 cm10 mm <br />0.01 m <br /> (8.5 cm85 mm <br />0.085 m <br />) +
subequal +
scarious +
8mm +  and 60mm +
usually triangular +  and linear +
usually deltate +  and lanceolate +
paniculiform +  and open +
indeterminate +  and determinate +
Luc Brouillet +, John C. Semple +, Geraldine A. Allen +, Kenton L. Chambers +  and Scott D. Sundberg† +
(Lindley) G. L. Nesom +
long-petiolate +
8.5 cm85 mm <br />0.085 m <br /> (10 cm100 mm <br />0.1 m <br />) +
1 cm10 mm <br />0.01 m <br /> (8.5 cm85 mm <br />0.085 m <br />) +
rounded +  and attenuate or cuneate +
indurate +
8mm;60mm +
Aster drummondii +
long-petiolate +
0.4 cm4 mm <br />0.004 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
5 cm50 mm <br />0.05 m <br /> (6.5 cm65 mm <br />0.065 m <br />) +
0.5 cm5 mm <br />0.005 m <br /> (11 cm110 mm <br />0.11 m <br />) +
ovate;ovate or oblong-lanceolate +
reduced +
1mm;50mm +
rugulose +  and muricate +
strigoso-ciliate +  and pilosulous +
subulate +  and linear-oblanceolate +
paniculiform +  and racemiform +
subsecund +  and divaricate +
reduced +
long to relatively +
barbellulate +  and barbellate +
sessile +  and petiolate +
Drummond’s aster +
not 2-lipped +  and actinomorphic +
0.45 cm4.5 mm <br />0.0045 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
cream +  and yellow +
reddish purple;purple;deep +
at maturity , more or less ampliate , tubes usually shorter +
0.35 cm3.5 mm <br />0.0035 m <br /> (0.45 cm4.5 mm <br />0.0045 m <br />) +
beaked +, 2-ribbed +  and 5-ribbed +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
brown +  and tan +
strigillose +  and glabrous +
compressed +  and obovoid +
fertile +  and bisexual +
fertile +  and bisexual +
sessile +, subpetiolate +  and petiolate +
Ala. +, Ark. +, Ga. +, Ill. +, Ind. +, Iowa +, Kans. +, Ky. +, La. +, Md. +, Mich. +, Minn. +, Miss. +, Mo. +, Nebr. +, Ohio +, Okla. +, Pa. +, Tenn. +, Tex. +, W.Va. +, Wis. +  and ne Mexico +
glabrate +  and sparsely strigillose +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
disciform +  and radiate +
indeterminate +
heterogamous +  and homogamous +
each +  and sessile +
0.6 cm6 mm <br />0.006 m <br /> (0.65 cm6.5 mm <br />0.0065 m <br />) +
0.4 cm4 mm <br />0.004 m <br /> (2.2 cm22 mm <br />0.022 m <br />) +
campanulate +
0.45 cm4.5 mm <br />0.0045 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
1 cm10 mm <br />0.01 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
2 (?) +  and 5 (?) +
1mm;1.8mm +
sessile +  and petiolate +
cauline +  and basal +
membranous +  and firm +
decurrent +
reflexed;spreading;erect +
triangular +  and lanceolate +
long-petiolate +
entire +, serrulate +, crenate-serrate +  and sharply serrate +
8.5 cm85 mm <br />0.085 m <br /> (10 cm100 mm <br />0.1 m <br />) +
10mm;85mm +
strigoso-ciliate +  and scabrous +
usually rounded +  and obtuse +
crenate-serrate to serrate +
8mm +  and 60mm +
2-carpellate +
cream +  and rose-tinged +
persistent +
25 +  and 40 +
0.3 cm3 mm <br />0.003 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
appressed-bracteate +
1.5 cm15 mm <br />0.015 m <br /> (4 cm40 mm <br />0.04 m <br />) +
0.2 cm2 mm <br />0.002 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
lanceolate +  and narrowly oblong-lanceolate +
styliferous +, neuter +  and pistillate +
bearing subulate enations +, hairy +  and bristly +
flat;slightly convex +
exalbuminous +
0.45 cm4.5 mm <br />0.0045 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
0.1mm;0.2mm +
branched +  and simple +
1 +  and 5 +
appendaged +  and truncate +
papillate +  and smooth +
Aster sagittifolius var. drummondii +
Symphyotrichum drummondii +
Symphyotrichum sect. Symphyotrichum +
species +
funnelform-campanulate +  and cylindric +
mucronulate +
at maturity , more or less ampliate , tubes usually shorter +
ampliate +
with stout , often woody caudices +  and short-rhizomatous +
30 cm300 mm <br />0.3 m <br /> (120 cm1,200 mm <br />1.2 m <br />) +
tree +, shrub +  and subshrub +
lanceolate +  and linear-lanceolate +