Symphyotrichum lentum

(Greene) G. L. Nesom

Phytologia 77: 286. 1995.

Common names: Suisun marsh aster
EndemicConservation concern
Basionym: Aster lentus Greene Man. Bot. San Francisco, 180. 1894
Synonyms: Aster chilensis var. lentus (Greene) Jepson Aster chilensis var. sonomensis (Greene) Jepson
Treatment appears in FNA Volume 20. Treatment on page 536. Mentioned on page 477.

Perennials, 40–150 (–200) cm, colonial; long-rhizomatous. Stems 1–5, ascending to erect, glabrous. Leaves thin, margins entire, apices acute, faces glabrous; basal withering by flowering, petiolate, blades linear to narrowly lanceolate, 100–150 × 5–10 mm, attenuate or cuneate, margins entire, apices acute, faces usually glabrous; proximalmost cauline usually withering by flowering, sessile, blades linear to narrowly lanceolate or oblanceolate, 50–90 × 5–8 (–20) mm, bases attenuate or cuneate; distal sessile, blades 40–80 × 5–8 (–15) mm, bases cuneate. Heads in paniculiform arrays, branches some at least 25 cm. Peduncles glabrous or sparsely villous, bracts 5–15, sessile, lance-linear to lanceolate, margins sometimes spiculate. Involucres campanulate, 5–8 mm. Phyllaries in 4–5 series, narrowly oblong (outer) to linear (inner), unequal (outer at least 3 times longer than wide), bases (outer) indurate 1/2 or less, margins scarious proximally, eciliate or ciliolate, green zones lanceolate to elliptic, apices acute to acuminate, faces glabrous. Ray-florets 20–45+; corollas violet, laminae 10–18 × 1–2 mm. Disc-florets 35–70+; corollas yellow, 5–7 mm, lobes triangular, 0.8–1.5 mm. Cypselae brown, cylindric to obovoid, not compressed, 3–4 mm, 2–4-nerved, faces glabrous or hairy; pappi white, 5–7 mm. 2n = 16, 64.


Phenology: Flowering Jul–Aug.
Habitat: Salt marshes, wet grasslands
Elevation: 0–200 m

Discussion

Symphyotrichum lentum is known only from the Sacramento Valley, North Bay County, lower Sacramento River, and San Francisco Bay areas. Probable intergrades with S. chilense have been noted.

of conservation concern

Selected References

None.

Lower Taxa

None.

"thin" is not a number.

... more about "Symphyotrichum lentum"
not tailed +, rounded +  and obtuse +
distinct +
10 cm100 mm <br />0.1 m <br /> (15 cm150 mm <br />0.15 m <br />) +
subequal +
scarious +
5mm +  and 10mm +
usually triangular +  and linear +
usually deltate +  and lanceolate +
paniculiform +
indeterminate +  and determinate +
Luc Brouillet +, John C. Semple +, Geraldine A. Allen +, Kenton L. Chambers +  and Scott D. Sundberg† +
(Greene) G. L. Nesom +
0.8 cm8 mm <br />0.008 m <br /> (2 cm20 mm <br />0.02 m <br />) +
5 cm50 mm <br />0.05 m <br /> (9 cm90 mm <br />0.09 m <br />) +
cuneate +, attenuate +, linear +  and narrowly lanceolate or oblanceolate +
indurate +
5mm;8mm +
Aster lentus +
sessile +  and petiolate +
0.8 cm8 mm <br />0.008 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
4 cm40 mm <br />0.04 m <br /> (8 cm80 mm <br />0.08 m <br />) +
cuneate;attenuate;linear;narrowly lanceolate or oblanceolate +
5mm;8mm +
rugulose +  and muricate +
lance-linear +  and lanceolate +
barbellulate +  and barbellate +
sessile +  and petiolate +
Suisun marsh aster +
not 2-lipped +  and actinomorphic +
yellow +  and violet +
at maturity , more or less ampliate , tubes usually shorter +
0.5 cm5 mm <br />0.005 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
beaked +, 2-ribbed +  and 5-ribbed +
strigillose +  and glabrous +
not compressed +, cylindric +  and obovoid +
fertile +  and bisexual +
fertile +  and bisexual +
0–200 m +
10 cm100 mm <br />0.1 m <br /> (15 cm150 mm <br />0.15 m <br />) +
hairy +  and glabrous +
acute;cuneate;attenuate;linear;narrowly lanceolate +
0.5 cm5 mm <br />0.005 m <br /> (1 cm10 mm <br />0.01 m <br />) +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Salt marshes, wet grasslands +
disciform +  and radiate +
indeterminate +
heterogamous +  and homogamous +
each +  and sessile +
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 /> (0.8 cm8 mm <br />0.008 m <br />) +
1.8 cm18 mm <br />0.018 m <br /> (2.1 cm21 mm <br />0.021 m <br />) +
10mm;18mm +
2 (?) +  and 5 (?) +
sessile +  and petiolate +
cauline +  and basal +
decurrent +
triangular +
not +  and hyaline +
100mm;150mm +
ciliolate +, eciliate +  and glabrous +
spiculate +
acute +, cuneate +, attenuate +, linear +  and narrowly lanceolate +
5mm +  and 10mm +
2-carpellate +
persistent +
25 +  and 40 +
0.5 cm5 mm <br />0.005 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
villous +  and glabrous +
Flowering Jul–Aug. +
narrowly oblong +  and linear +
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 +
Endemic +  and Conservation concern +
branched +  and simple +
ascending +  and erect +
1 +  and 5 +
appendaged +  and truncate +
papillate +  and smooth +
Aster chilensis var. lentus +  and Aster chilensis var. sonomensis +
Symphyotrichum lentum +
Symphyotrichum sect. Occidentales +
species +
funnelform-campanulate +  and cylindric +
at maturity , more or less ampliate , tubes usually shorter +
ampliate +
150 cm1,500 mm <br />1.5 m <br /> (200 cm2,000 mm <br />2 m <br />) +
40 cm400 mm <br />0.4 m <br /> (150 cm1,500 mm <br />1.5 m <br />) +
tree +, shrub +  and subshrub +
lanceolate +  and elliptic +