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

Thelesperma ambiguum

A. Gray

Proc. Amer. Acad. Arts 19: 16. 1883.

John L. Strother
Synonyms: Thelesperma fraternum Shinners Thelesperma megapotamicum var. ambiguum (A. Gray) Shinners
Treatment appears in FNA Volume 21. Treatment on page 201. Mentioned on page 200.

Perennials or subshrubs, 10–30 (–50) cm. Cauline leaves crowded to ± scattered over proximal 1/3–1/2 of plant heights, internodes mostly 5–50 (–80+) mm; lobes mostly linear to filiform, sometimes oblanceolate, (5–) 15–75 × 0.5–1 (–2) mm. Calyculi of 3–5+ ovate to oblong bractlets 1–3 mm. Ray-florets usually 8, rarely 0; laminae yellow, 4–8 (–12+) mm. Disc corollas redbrown, throats shorter than lobes. Cypselae 4–5+ mm; pappi usually 1.5–2+ mm, rarely 0.2n = 44.


Phenology: Flowering Mar–Jun.
Habitat: Disturbed sites on sands or clays
Elevation: 10–200 m

Distribution

V21-494-distribution-map.gif

N.Mex., Tex., Mexico (Nuevo León), Mexico (Tamaulipas)

Discussion

Thelesperma ambiguum is similar to T. megapotamicum; it may be better treated as a variety of the latter.

Selected References

None.

Lower Taxa

None.

"broader" is not a number.

... more about "Thelesperma ambiguum"
RDF feed
2n chromosome quantity
44 +
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
A. Gray +
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 +
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 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 /> (0.3 cm3 mm <br />0.003 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
crowded +  and more or less 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
4mm;5mm +
Disc-floret quantity
20 (100) +
Disc-floret reproduction
fertile +  and bisexual +
Disc corolla coloration
Redbrown (?) +
Disc floret architecture
staminate +
Disc floret reproduction
fertile +  and bisexual +
Distribution
N.Mex. +, Tex. +, Mexico (Nuevo León) +  and Mexico (Tamaulipas) +
Elevation
10–200 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 sites on sands or clays +
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 atypical heights
5 cm50 mm <br />0.05 m <br /> (8 cm80 mm <br />0.08 m <br />) +
Internode heights
0.5 cm5 mm <br />0.005 m <br /> (5 cm50 mm <br />0.05 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 +
Lamina atypical some measurement
0.8 cm8 mm <br />0.008 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
Lamina coloration
yellow +
Lamina some measurement
0.4 cm4 mm <br />0.004 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
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
0.5 cm5 mm <br />0.005 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
Lobe atypical quantity
3 (5) +
Lobe atypical width
0.1 cm1 mm <br />0.001 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
Lobe length
15mm (75mm) +
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 +
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 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
0.15 cm1.5 mm <br />0.0015 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 Mar–Jun. +
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
1/3 +  and 1/2 +
Publication title
Proc. Amer. Acad. Arts +
Publication year
1883 +
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 494.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 fraternum +  and Thelesperma megapotamicum var. ambiguum +
Taxon family
Asteraceae +
Taxon name
Thelesperma ambiguum +
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
30 cm300 mm <br />0.3 m <br /> (50 cm500 mm <br />0.5 m <br />) +
Whole-organism duration
perennial +
Whole-organism some measurement
10 cm100 mm <br />0.1 m <br /> (30 cm300 mm <br />0.3 m <br />) +
Whole organism atypical some measurement
30 cm300 mm <br />0.3 m <br /> (50 cm500 mm <br />0.5 m <br />) +
Whole organism growth form
subshrub +
Whole organism some measurement
10cm (30cm) +
X chromosome quantity
12 +