Symphyotrichum frondosum

(Nuttall) G. L. Nesom

Phytologia 77: 282. 1995.

Common names: Short-rayed alkali aster
Basionym: Tripolium frondosum Nuttall Trans. Amer. Philos. Soc., n. s. 7: 296. 1840
Synonyms: Aster frondosus (Nuttall) Torrey & A. Gray Brachyactis frondosa (Nuttall) A. Gray
Treatment appears in FNA Volume 20. Treatment on page 499. Mentioned on page 465, 467.

Annuals or sometimes perennials, 5–140 cm. Stems 1–6+, decumbent to erect (straight), glabrous. Leaves thin, margins entire (basal sometimes serrulate), sometimes ciliate or remotely scabrous, acute to ± obtuse, faces glabrous; basal withering by flowering, petiolate, blades oblanceolate to spatulate, 20–115 × 2–15 mm [cult.], bases attenuate; proximal cauline withering by flowering; cauline subpetiolate or sessile (distal), blades oblanceolate to linear, 10–80 × 1.5–10 mm, reduced distally, bases cuneate. Heads (radiate) in narrow, paniculiform to spiciform arrays, branches often in axils of nearly every leaf, ascending. Peduncles glabrous, bracts linear. Involucres narrowly campanulate, 5–9 mm. Phyllaries in 3–4 series, ± spreading, oblong-oblanceolate or lanceolate to obovate, subequal to ± unequal, linear-lanceolate or linear (innermost), bases scarious, margins narrowly scarious, hyaline, erose, ciliolate, green zones (outer) foliaceous, (inner) lanceolate, apices obtuse to rounded, inner acute, mucronulate, faces glabrous. Ray-florets 90–110 in 4–5+ series; corollas pink to pinkish white, laminae 1.5–2 × 0.1–0.2 mm (surpassing style-branches, barely surpassing disc corollas; tubes ± 3 mm). Disc-florets ± 37; corollas yellow, 4.4–5.2 mm, barely ampliate, tubes much longer than cylindric limbs, lobes lanceolate, ± 0.3 mm. Cypselae tan, obovoid, ± compressed, 2 mm, 2–3-nerved, faces strigillose; pappi white to yellowish, 6.3–7.5 mm. 2n = 14.


Phenology: Flowering Aug–Oct.
Habitat: Moist, usually saline soils, summer-receding shores of lakes or ponds, vernally moist, alkaline bottoms, marshes, often in steppes
Elevation: 10–2200 m

Distribution

V20-1119-distribution-map.gif

B.C., Ariz., Calif., Colo., Idaho, Nev., N.Mex., Oreg., Utah, Wash., Wyo., Mexico (Baja California)

Discussion

Selected References

None.

Lower Taxa

None.

"thin" is not a number.

... more about "Symphyotrichum frondosum"
not tailed +, rounded +  and obtuse +
distinct +
subequal +
scarious +
usually triangular +  and linear +
usually deltate +  and lanceolate +
paniculiform +  and spiciform +
indeterminate +  and determinate +
Luc Brouillet +, John C. Semple +, Geraldine A. Allen +, Kenton L. Chambers +  and Scott D. Sundberg† +
(Nuttall) G. L. Nesom +
2 cm20 mm <br />0.02 m <br /> (11.5 cm115 mm <br />0.115 m <br />) +
cuneate +, attenuate +, oblanceolate +  and spatulate +
scarious +
2mm;15mm +
Tripolium frondosum +
1 cm10 mm <br />0.01 m <br /> (8 cm80 mm <br />0.08 m <br />) +
oblanceolate;linear +
reduced +
1.5mm;10mm +
rugulose +  and muricate +
barbellulate +  and barbellate +
sessile +  and subpetiolate +
Short-rayed alkali aster +
not 2-lipped +  and actinomorphic +
yellow +, pink +  and pinkish white +
at maturity , more or less ampliate , tubes usually shorter +
ampliate +
0.44 cm4.4 mm <br />0.0044 m <br /> (0.52 cm5.2 mm <br />0.0052 m <br />) +
beaked +, 2-ribbed +  and 5-ribbed +
strigillose +  and glabrous +
compressed +  and obovoid +
fertile +  and bisexual +
fertile +  and bisexual +
B.C. +, Ariz. +, Calif. +, Colo. +, Idaho +, Nev. +, N.Mex. +, Oreg. +, Utah +, Wash. +, Wyo. +  and Mexico (Baja California) +
10–2200 m +
strigillose +  and glabrous +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Moist, usually saline soils, summer-receding shores of lakes or ponds, vernally moist, alkaline bottoms, marshes, often in steppes +
disciform +  and radiate +
indeterminate +
heterogamous +  and homogamous +
each +  and sessile +
mucronulate +  and acute +
0.4 cm4 mm <br />0.004 m <br /> (2.2 cm22 mm <br />0.022 m <br />) +
campanulate +
0.5 cm5 mm <br />0.005 m <br /> (0.9 cm9 mm <br />0.009 m <br />) +
1.8 cm18 mm <br />0.018 m <br /> (2.1 cm21 mm <br />0.021 m <br />) +
1.5mm;2mm +
2 (?) +  and 5 (?) +
0.1mm;0.2mm +
sessile +  and petiolate +
cauline +  and basal +
cylindric +
decurrent +
lanceolate +
ciliolate +, scabrous +  and ciliate +
acute +  and more or less obtuse +
2-carpellate +
white +  and yellowish +
persistent +
25 +  and 40 +
0.63 cm6.3 mm <br />0.0063 m <br /> (0.75 cm7.5 mm <br />0.0075 m <br />) +
Flowering Aug–Oct. +
linear +, linear-lanceolate +, lanceolate +  and obovate +
subequal +  and more or less unequal +
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 +
decumbent +  and erect +
1 +  and 6 +
appendaged +  and truncate +
papillate +  and smooth +
Aster frondosus +  and Brachyactis frondosa +
Symphyotrichum frondosum +
Symphyotrichum sect. Conyzopsis +
species +
funnelform-campanulate +  and cylindric +
at maturity , more or less ampliate , tubes usually shorter +
ampliate +
perennial +  and annual +
5 cm50 mm <br />0.05 m <br /> (140 cm1,400 mm <br />1.4 m <br />) +
tree +, shrub +  and subshrub +
lanceolate +