familyAsteraceae
tribeAsteraceae tribe Astereae
genusSymphyotrichum
subgenusSymphyotrichum subg. Symphyotrichum
sectionSymphyotrichum sect. Occidentales

Symphyotrichum sect. Occidentales

(Rydberg) G. L. Nesom

Phytologia 77: 271. 1995.

Luc Brouillet, John C. Semple, Geraldine A. Allen, Kenton L. Chambers, Scott D. Sundberg†
Basionym: Occidentales Rydberg Fl. Colorado, 352. 1906
Treatment appears in FNA Volume 20. Treatment on page 531. Mentioned on page 467, 498, 538.

Perennials, eglandular; rhizomatous. Stems usually simple, sometimes ± branched. Heads radiate. Ray-florets fewer than disc-florets, in 1 series (conspicuous). Disc corollas ± ampliate, lobes erect. Pappi shorter than to equaling disc-florets at flowering. x = 8.

Distribution

w North America

Discussion

Species 12 (12 in the flora).

Selected References

Allen, G. A. 1984. Morphological and cytological variation within the western North American Aster occidentalis complex (Asteraceae). Syst. Bot. 9: 175–191.

Lower Taxa

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Anther base shape
not tailed +, rounded +  and obtuse +
Anther dehiscence
introrse +
Anther fusion
connate +
Apex architecture
foliaceous +
Apex fusion
distinct +
Apex growth form or texture
herbaceous +
Apex size
subequal +
Apex texture
scarious +
Apical appendage quantity
0 +
Apical appendage shape
usually triangular +  and linear +
Appendage pubescence
hirsute +
Appendage relief
papillate +
Appendage shape
usually deltate +  and lanceolate +
Array architecture
spiciform +, racemiform +, paniculiform +  and corymbiform +
Array development
indeterminate +  and determinate +
Author
Luc Brouillet +, John C. Semple +, Geraldine A. Allen +, Kenton L. Chambers +  and Scott D. Sundberg† +
Authority
(Rydberg) G. L. Nesom +
Band architecture
continuous +
Band quantity
1 +
Basal leaf life cycle
withering +
Basal leaf shape
spatulate;oblanceolate elliptic or ovate +
Base architecture or fixation
clasping +
Base shape
auriculate +, attenuate +, cuneate +, rounded +, subcordate +  and cordate +
Base texture
indurate +
Basionyms
Occidentales +
Blade architecture
1-nerved +, subsessile +, sessile +  and petiolate +
Blade life cycle
flowering +
Blade shape
widely ovate;linear +
Body architecture or pubescence or relief
smooth +
Body architecture or shape
ribbed +
Body relief
rugulose +  and muricate +
Branch arrangement or course or shape
linear +
Branch structure in adjective form
stigmatic +
Bristle architecture
barbellulate +  and barbellate +
Bristle pappus duration
persistent +
Bristle shape
Attenuate (?) +
Calyculus presence
absent +
Cauline leaf architecture
sessile +  and petiolate +
Corolla architecture
not 2-lipped +  and actinomorphic +
Corolla coloration
purplish +  and reddish or pinkish +
Corolla height or length or size
at maturity , more or less ampliate , tubes usually shorter +
Corolla presence
absent +
Cypsela architecture
2-6-nerved +
Cypsela architecture or shape
beaked +, 2-ribbed +  and 5-ribbed +
Cypsela growth form
dimorphic +
Cypsela pubescence
strigillose +  and glabrous +
Cypsela shape
compressed +, cylindric +  and obovoid or oblong +
Disc-floret atypical quantity
50 (110) +
Disc-floret quantity
15 (50) +
Disc-floret reproduction
fertile +  and bisexual +
Disc-floret variability
equaling +
Disc corolla size
ampliate +
Disc floret architecture
staminate +
Disc floret reproduction
fertile +  and bisexual +
Distribution
w North America +
Embryo course
straight +
Face architecture
eglandular +
Face pubescence
strigillose +, glabrous +, stipitate-glandular +  and hairy +
Filament fusion
distinct +
Floret architecture
pistillate +, staminate +  and neuter +
Floret atypical quantity
5;15 +
Floret position
proximal +
Floret quantity
1;5 +
Floret reproduction
bisexual +
Fruit architecture
winged +  and beaked +
Fruit condition or texture
dry +
Fruit density
dispersed +
Head architecture
disciform +  and radiate +
Head architecture or arrangement
radiate +
Head arrangement
singly +
Head development
indeterminate +
Head reproduction
heterogamous +  and homogamous +
Illustration copyright
Flora of North America Association +
Illustrator
Bee F. Gunn +
Individual head architecture
each +  and sessile +
Involucre diameter
0.4 cm4 mm <br />0.004 m <br /> (2.2 cm22 mm <br />0.022 m <br />) +
Involucre position relational
surrounding +
Involucre shape
campanulate;hemispheric +
Lamina atypical length
1.8 cm18 mm <br />0.018 m <br /> (2.1 cm21 mm <br />0.021 m <br />) +
Lamina length
4.5mm;5mm +
Lamina quantity
2 (?) +  and 5 (?) +
Lamina width
0.1mm;0.2mm +
Leaf architecture
sessile +  and petiolate +
Leaf arrangement
alternate +
Leaf position
cauline +  and basal +
Line quantity
2 +
Line shape
decurrent +
Lobe atypical quantity
4 (5) +
Lobe orientation
erect +
Lobe quantity
5 (?) +
Lobe shape
lanceolate +, triangular +  and deltate +
Margin architecture or relief
erose +
Margin architecture or shape
dentate to pinnatifid +  and entire +
Margin coloration
not +  and hyaline +
Margin pubescence
ciliate +  and scabrous +
Margin shape
coarsely serrate +  and crenate or entire +
Margin texture
scarious +
Nerve atypical quantity
2 (3) +
Nerve quantity
3 (5) +
Number of lower taxa
12 +
Outer phyllarie architecture
foliaceous +
Ovary architecture
2-carpellate +
Ovary architecture or structure in adjective form
1-locular +
Ovary position
inferior +
Ovule fixation
attached +
Ovule orientation
anatropous +
Ovule quantity
1 +
Pappus architecture
barbellate +
Pappus atypical quantity
40 (55) +
Pappus coloration
white +  and brownish +
Pappus duration
persistent +
Pappus height or length or size
shorter +
Pappus quantity
25 +  and 40 +
Pappus variability
equal +
Pericarp fragility
tough +
Pericarp width
thick +
Peripheral floret presence
absent +
Peripheral floret quantity
In 1 (3+ series) +
Petal fusion
connate +
Phyllarie architecture
1(-3)-nerved +
Phyllarie duration
persistent +
Phyllarie fusion
distinct +
Phyllarie life cycle
falling +
Phyllarie quantity
20 (84) +
Phyllarie shape
oblanceolate or spatulate +  and linear +
Phyllarie size
strongly unequal +  and subequal +
Phyllarie texture
Herbaceous (Chartaceous or scarious) +
Publication title
Phytologia +
Publication year
1995 +
Ray-floret architecture
styliferous +, neuter +  and pistillate +
Ray-floret atypical quantity
35 (75) +
Ray-floret presence
absent +
Ray-floret quantity
Fewer (?) +
Ray-floret reproduction
sterile +
Ray floret atypical quantity
50 (60) +
Ray floret quantity
14 (110) +
Ray floret size
reduced +
Receptacle architecture
epaleate +
Receptacle pubescence
bearing subulate enations +, hairy +  and bristly +
Receptacle relief
pitted +
Receptacle shape
flat;slightly convex +
Reference
allen1984a +
Root texture
fibrous +
Seed architecture
exalbuminous +
Seed quantity
1 +
Sepal variability
modifed +
Series architecture
pistillate +
Series atypical quantity
1 (3) +
Series length
0.45 cm4.5 mm <br />0.0045 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
Series quantity
1 +
Series reproduction
fertile +
Series width
0.1mm;0.2mm +
Source xml
https://bibilujan@bitbucket.org/aafc-mbb/fna-fine-grained-xml.git/src/84153f6d59a0a91d69695978a64cee7560374f8e/V19-20-21/V20 1180.xml +
Stamen arrangement
alternate +
Stamen atypical quantity
4 (5) +
Stamen quantity
5 +
Stem architecture
branched +  and simple +
Stem fragility
brittle +
Stem growth form
vinelike +
Stem orientation
ascending +  and erect +
Stem pubescence
glabrous +, hairy +  and glabrate +
Style-branch appendage shape
lanceolate +
Style-branch architecture
appendaged +  and truncate +
Style architecture
2-branched +
Style pubescence
glabrous +
Style quantity
1 +
Style relief
papillate +  and smooth +
Synonyms
Aster sect. Heterastrum +  and Aster subg. Symphyotrichum +
Taxon family
Asteraceae +
Taxon name
Symphyotrichum sect. Occidentales +
Taxon parent
Symphyotrichum subg. Symphyotrichum +
Taxon rank
section +
Throat shape
funnelform-campanulate +  and cylindric +
Tube height or length or size
at maturity , more or less ampliate , tubes usually shorter +
Tube life cycle
maturity +
Tube size
ampliate +
Volume
Volume 20 +
Whole-organism architecture
rhizomatous +  and eglandular +
Whole-organism duration
perennial +
Whole-organism some measurement
2 cm20 mm <br />0.02 m <br /> (200 cm2,000 mm <br />2 m <br />) +
Whole organism growth form
tree +, shrub +  and subshrub +
X chromosome quantity
8 +
Zone coloration
green +
Zone shape
usually diamond-shaped +  and lanceolate +