familyAsteraceae
tribeAsteraceae tribe Heliantheae
subtribeAsteraceae (tribe Heliantheae) subtribe Coreopsidinae
genusThelesperma
speciesThelesperma megapotamicum

Thelesperma megapotamicum

(Sprengel) Kuntze

Revis. Gen. Pl. 3(2): 182. 1898.

John L. Strother
Basionym: Bidens megapotamica Sprengel Syst. Veg. 3: 454. 1826
Synonyms: Thelesperma gracile (Torrey) A. Gray
Treatment appears in FNA Volume 21. Treatment on page 202. Mentioned on page 200, 201.

Perennials or subshrubs, (20–) 30–80+ cm. Cauline leaves ± scattered over proximal 1/2–3/4 of plant heights, internodes mostly 40–100 mm; lobes mostly linear to filiform, sometimes oblanceolate, 20–40 (–50+) × 0.5–1 (–2.5) mm. Calyculi of 3–5+ ovate to oblong bractlets 1–2 (–3) mm. Ray-florets 0. Disc corollas yellow, often with redbrown nerves, throats shorter than lobes. Cypselae 5–8 mm; pappi 1–2 (–3) mm. 2n = 22, 44.


Phenology: Flowering (Apr–)May–Oct.
Habitat: Disturbed places on sands or clays, oak/juniper woodlands, desert scrub, yellow-pine forests
Elevation: 300–2900 m

Distribution

V21-495-distribution-map.gif

Ariz., Ark., Colo., Kans., Nebr., N.Mex., Okla., S.Dak., Tex., Utah, Wyo., Mexico (Chihuahua), Mexico (Coahuila), South America

Discussion

Thelesperma megapotamicum sometimes persists after plantings outside its natural range in the flora area and may become established (e.g., in California).

Selected References

None.

Lower Taxa

None.

"broader" is not a number.

... more about "Thelesperma megapotamicum"
RDF feed
2n chromosome quantity
44 +  and 22 +
Anther base shape
not tailed +, rounded +  and obtuse +
Anther dehiscence
introrse +
Anther fusion
connate +
Anther theca coloration
dark +  and pale +
Apex fusion
connate +  and distinct +
Apex growth form or texture
herbaceous +
Apex size
subequal +
Apex texture
scarious +
Apical appendage presence
absent +
Apical appendage shape
usually ovate +  and lanceolate +
Appendage pubescence
hirsute +
Appendage relief
papillate +
Appendage shape
usually deltate +  and lanceolate +
Array architecture
corymbiform +
Array architecture or fragility
loose +
Array development
indeterminate +  and determinate +
Author
John L. Strother +
Authority
(Sprengel) Kuntze +
Awn architecture
smooth +  and ciliate or barbed +
Awn atypical quantity
4 (8) +
Awn quantity
1 +  and 2 +
Awn shape
subulate +
Band architecture
continuous +
Band quantity
1 +
Base shape
decurrent +
Basionyms
Bidens megapotamica +
Blade architecture
compound +  and simple +
Blade shape
lobed +
Body architecture
winged;ribbed;winged;ribbed +
Body architecture or pubescence or relief
smooth +
Body relief
tuberculate +  and rugose +
Bract atypical quantity
8 (21) +
Bract quantity
3;8 +
Bractlet atypical quantity
8 (21) +
Bractlet atypical some measurement
0.2 cm2 mm <br />0.002 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
Bractlet fusion
distinct +
Bractlet growth form or texture
herbaceous +
Bractlet orientation
reflexed +  and spreading +
Bractlet quantity
3;5 +
Bractlet shape
ovate;oblong +
Bractlet some measurement
0.1 cm1 mm <br />0.001 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
Branch arrangement or course or shape
linear +
Branch structure in adjective form
stigmatic +
Bristle architecture
barbellulate +  and barbellate +
Bristle shape
Plumose (?) +
Calyculus presence
absent +
Calyculus quantity
Of 1 (15+ bractlets) +
Cauline leaf arrangement
scattered +
Corolla architecture
zygomorphic +
Corolla coloration
redbrown +, yellow +  and bicolored +
Corolla height or length or size
shorter +
Corolla length or size
longer +
Cypsela architecture
monomorphic +
Cypsela architecture or shape
beaked +
Cypsela course or shape
arcuate +
Cypsela growth form
dimorphic +
Cypsela height or length or size
shorter +
Cypsela position
outer +
Cypsela shape
obcompressed +
Cypsela some measurement
5mm;8mm +
Disc-floret quantity
20 (100) +
Disc-floret reproduction
fertile +  and bisexual +
Disc corolla coloration
Yellow (?) +
Disc floret architecture
staminate +
Disc floret reproduction
fertile +  and bisexual +
Distribution
Ariz. +, Ark. +, Colo. +, Kans. +, Nebr. +, N.Mex. +, Okla. +, S.Dak. +, Tex. +, Utah +, Wyo. +, Mexico (Chihuahua) +, Mexico (Coahuila) +  and South America +
Elevation
300–2900 m +
Embryo course
straight +
Face architecture or shape
beaked +
Face pubescence
hairy +  and glabrous +
Face relief
papillate +  and tuberculate or verrucate +
Face shape
linear-fusiform;4-angled;ovate;orbiculate;oblong;linear;cuneate +
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 +
Glomerule arrangement
singly +
Habitat
Disturbed places on sands or clays, oak/juniper woodlands, desert scrub, yellow-pine forests +
Head architecture
discoid +  and radiate +
Head arrangement
in loose , corymbiform arrays +  and singly +
Head development
indeterminate +
Head reproduction
homogamous +  and heterogamous +
Illustration copyright
Flora of North America Association +
Illustrator
Yevonn Wilson-Ramsey +
Individual head architecture
each +  and sessile +
Inner corolla shape
obcompressed +  and columnar +
Internode heights
4 cm40 mm <br />0.04 m <br /> (10 cm100 mm <br />0.1 m <br />) +
Involucre diameter
0.4 cm4 mm <br />0.004 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
Involucre position relational
surrounding +
Involucre shape
hemispheric;urceolate +
Leaf architecture
sessile +  and petiolate +
Leaf arrangement
opposite +
Leaf position
cauline +  and basal +
Line quantity
2 +
Lobe arrangement or course or shape
lance-linear +
Lobe atypical length
4 cm40 mm <br />0.04 m <br /> (5 cm50 mm <br />0.05 m <br />) +
Lobe atypical quantity
3 (5) +
Lobe atypical width
0.1 cm1 mm <br />0.001 m <br /> (0.25 cm2.5 mm <br />0.0025 m <br />) +
Lobe length
20mm (40mm) +
Lobe quantity
5 (5) +
Lobe shape
oblanceolate +, mostly linear +  and filiform +
Lobe size
unequal +
Lobe variability
equal +
Lobe width
0.05 cm0.5 mm <br />5.0e-4 m <br /> (?) +  and 0.1 cm1 mm <br />0.001 m <br /> (?) +
Margin architecture
winged +
Margin architecture or shape
dentate to pinnatifid or palmatifid +  and entire +
Margin texture
scarious +
Nerve coloration
redbrown +
Number of lower taxa
0 +
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 +
Palea life cycle
falling +
Palea shape
obovate;oblong +
Palea texture
scarious +
Pappus atypical some measurement
0.2 cm2 mm <br />0.002 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
Pappus duration
persistent +
Pappus life cycle
falling +
Pappus presence
absent +
Pappus shape
of 1-2 , smooth to ciliate or barbed awns or scales +  and coroniform +
Pappus some measurement
0.1 cm1 mm <br />0.001 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
Pericarp fragility
tough +
Pericarp width
thick +
Peripheral floret presence
absent +
Peripheral floret quantity
In 1 (3+ series) +
Petal fusion
connate +
Phenology
Flowering (Apr–)May–Oct. +
Phyllary duration
persistent +
Phyllary fusion
connate +
Phyllary lengths
1/5 (7/8) +
Phyllary life cycle
falling +
Phyllary quantity
2 +, 5 +  and 8 +
Phyllary shape
Lanceovate (Ovate) +
Phyllary size
unequal +
Phyllary texture
Less leathery (Membranous) +
Phyllary variability
equal +
Plant position
proximal +
Plant quantity
1/2 +  and 3/4 +
Publication title
Revis. Gen. Pl. +
Publication year
1898 +
Ray-floret architecture
neuter +
Ray-floret presence
absent +
Ray-floret quantity
8 (?) +
Ray-floret reproduction
sterile +  and fertile +
Receptacle architecture
paleate +
Receptacle pubescence
bearing subulate enations +, hairy +  and bristly +
Receptacle shape
flat;convex +
Reference
None +
Root texture
fibrous +
Scale shape
subulate +
Seed architecture
exalbuminous +
Seed quantity
1 +
Sepal variability
modifed +
Series atypical quantity
1 (2) +
Series quantity
2 +
Source xml
https://bibilujan@bitbucket.org/aafc-mbb/fna-fine-grained-xml.git/src/84153f6d59a0a91d69695978a64cee7560374f8e/V19-20-21/V21 495.xml +
Stamen arrangement
alternate +
Stamen atypical quantity
4 (5) +
Stamen quantity
5 +
Stem architecture
branched +
Stem orientation
erect +
Stem quantity
1 +
Style-branch architecture
appendaged +  and truncate +
Style architecture
2-branched +
Style pubescence
hirsutulous +  and glabrous +
Style quantity
1 +
Style relief
papillate +
Synonyms
Thelesperma gracile +
Taxon family
Asteraceae +
Taxon name
Thelesperma megapotamicum +
Taxon parent
Thelesperma +
Taxon rank
species +
Throat height or length or size
shorter +
Throat variability
equal +
Tube variability
equaling +
Ultimate margin shape
toothed +  and entire +
Volume
Volume 21 +
Whole-organism atypical some measurement
20 cm200 mm <br />0.2 m <br /> (30 cm300 mm <br />0.3 m <br />) +
Whole-organism duration
perennial +
Whole-organism some measurement
30 cm300 mm <br />0.3 m <br /> (80 cm800 mm <br />0.8 m <br />) +
Whole organism atypical some measurement
20 cm200 mm <br />0.2 m <br /> (30 cm300 mm <br />0.3 m <br />) +
Whole organism growth form
subshrub +
Whole organism some measurement
30cm (80cm) +
X chromosome quantity
12 +