Thelesperma filifolium

(Hooker) A. Gray

Hooker’s J. Bot. Kew Gard. Misc. 1: 252. 1849.

Illustrated
Basionym: Coreopsis filifolia Hooker Bot. Mag. 63: plate 3505. 1836
Synonyms: Thelesperma filifolium var. intermedium (Rydberg) Shinners Thelesperma intermedium
Treatment appears in FNA Volume 21. Treatment on page 202. Mentioned on page 200, 203.

Annuals (sometimes persisting), 10–40 (–70+) cm. Cauline leaves crowded to ± scattered over proximal 1/2–3/4 of plant heights, internodes mostly 10–35 (–50+) mm; lobes mostly linear to filiform, sometimes oblanceolate, 5–30 (–55+) × 0.5–1 (–3+) mm. Calyculi of 7–8+ linear to narrowly triangular bractlets (2–) 4–8+ mm. Ray-florets 8; laminae yellow to golden yellow (sometimes proximally suffused with redbrown), 12–20+ mm. Disc corollas redbrown or yellow with redbrown nerves, throats shorter than lobes. Cypselae 3.5–4+ mm; pappi 0.5–1 (–2+) mm. 2n = 16, 18.


Phenology: Flowering Mar–Aug(–Oct).
Habitat: Disturbed sites on clays or sandy soils, rocky slopes, often on limestone
Elevation: 10–2200 m

Distribution

V21-499-distribution-map.gif

Ark., Colo., Kans., La., Miss., Mo., Nebr., N.Mex., Okla., S.Dak., Tex., Wyo., Mexico (Nuevo León)

Discussion

As here circumscribed, Thelesperma filifolium includes plants that others have treated as a distinct species or variety: T. intermedium or T. filifolium var. intermedium, characterized as plants mostly 10–40 cm (versus taller); internodes “relatively short” (versus longer); calyculus bractlets mostly 1/4–1/2 lengths of phyllaries (versus more than 1/2 as long); ray corollas yellow (versus “golden yellow”); disc corollas yellow (versus sometimes red-brown); distribution mostly north and west of the typical form (Colorado, Kansas, Nebraska, New Mexico, w Oklahoma, South Dakota, c and w Texas, Wyoming).

According to A. Cronquist (1980), Thelesperma trifidum (Poiret) Britton has been misapplied (e.g., M. L. Fernald 1950) to T. filifolium.

Selected References

None.

Lower Taxa

None.

"broader" is not a number.

... more about "Thelesperma filifolium"
not tailed +, rounded +  and obtuse +
dark +  and pale +
connate +  and distinct +
subequal +
scarious +
usually ovate +  and lanceolate +
usually deltate +  and lanceolate +
indeterminate +  and determinate +
John L. Strother +
(Hooker) A. Gray +
smooth +  and ciliate or barbed +
1 +  and 2 +
subulate +
decurrent +
Coreopsis filifolia +
compound +  and simple +
winged;ribbed;winged;ribbed +
tuberculate +  and rugose +
0.2 cm2 mm <br />0.002 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
reflexed +  and spreading +
linear;narrowly triangular +
0.4 cm4 mm <br />0.004 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
barbellulate +  and barbellate +
crowded +  and more or less scattered +
redbrown +, yellow +  and bicolored +
obcompressed +
fertile +  and bisexual +
fertile +  and bisexual +
Ark. +, Colo. +, Kans. +, La. +, Miss. +, Mo. +, Nebr. +, N.Mex. +, Okla. +, S.Dak. +, Tex. +, Wyo. +  and Mexico (Nuevo León) +
10–2200 m +
hairy +  and glabrous +
papillate +  and tuberculate or verrucate +
linear-fusiform;4-angled;ovate;orbiculate;oblong;linear;cuneate +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Disturbed sites on clays or sandy soils, rocky slopes, often on limestone +
discoid +  and radiate +
in loose , corymbiform arrays +  and singly +
indeterminate +
homogamous +  and heterogamous +
each +  and sessile +
obcompressed +  and columnar +
3.5 cm35 mm <br />0.035 m <br /> (5 cm50 mm <br />0.05 m <br />) +
1 cm10 mm <br />0.01 m <br /> (3.5 cm35 mm <br />0.035 m <br />) +
0.4 cm4 mm <br />0.004 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
hemispheric;urceolate +
yellow +  and golden yellow +
1.2 cm12 mm <br />0.012 m <br /> (2 cm20 mm <br />0.02 m <br />) +
sessile +  and petiolate +
cauline +  and basal +
3 cm30 mm <br />0.03 m <br /> (5.5 cm55 mm <br />0.055 m <br />) +
0.1 cm1 mm <br />0.001 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
oblanceolate +, mostly linear +  and filiform +
unequal +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (?) +  and 0.1 cm1 mm <br />0.001 m <br /> (?) +
dentate to pinnatifid or palmatifid +  and entire +
2-carpellate +
obovate;oblong +
0.1 cm1 mm <br />0.001 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
persistent +
of 1-2 , smooth to ciliate or barbed awns or scales +  and coroniform +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
Flowering Mar–Aug(–Oct). +
2 +, 5 +  and 8 +
1/2 +  and 3/4 +
Hooker’s J. Bot. Kew Gard. Misc. +
sterile +  and fertile +
bearing subulate enations +, hairy +  and bristly +
flat;convex +
subulate +
exalbuminous +
Illustrated +
appendaged +  and truncate +
hirsutulous +  and glabrous +
papillate +
Thelesperma filifolium var. intermedium +  and Thelesperma intermedium +
Thelesperma filifolium +
Thelesperma +
species +
toothed +  and entire +
40 cm400 mm <br />0.4 m <br /> (70 cm700 mm <br />0.7 m <br />) +
10 cm100 mm <br />0.1 m <br /> (40 cm400 mm <br />0.4 m <br />) +