Tetragonotheca texana

A. Gray & Engelmann

Proc. Amer. Acad. Arts 1: 48. 1847.

Treatment appears in FNA Volume 21. Treatment on page 179. Mentioned on page 178.

Stems sparsely tomentulose or glabrous (nodes usually auriculate-appendaged). Leaves mostly cauline; blades ovate to lanceolate in outline, 3–7 × 1–3 cm, subentire to incised or irregularly pinnatifid. Ray-florets 8–13; laminae 10–18 mm. Cypselae ± quadrate, 2.5–4 mm; pappi 0, or (often fragile) of 1–10+ subulate or acerose scales to 0.5 (–1.5) mm. 2n = 34.


Phenology: Flowering spring–summer.
Habitat: Sandy soils, often with mesquite
Elevation: 50–200 m

Distribution

V21-438-distribution-map.gif

Tex., Mexico (Coahuila), Mexico (Nuevo León), Mexico (Tamaulipas)

Discussion

Selected References

None.

Lower Taxa

None.
... more about "Tetragonotheca texana"
not tailed +, rounded +  and obtuse +
darkened +  and pale +
connate +  and distinct +
subequal +
scarious +
usually ovate +  and lanceolate +
usually deltate +  and lanceolate +
indeterminate +  and determinate +
John L. Strother +
A. Gray & Engelmann +
decurrent +
compound +  and simple +
3 cm30 mm <br />0.03 m <br /> (7 cm70 mm <br />0.07 m <br />) +
subentire;incised or irregularly pinnatifid +
1 cm10 mm <br />0.01 m <br /> (3 cm30 mm <br />0.03 m <br />) +
winged;ribbed;winged;ribbed +
tuberculate +  and rugose +
barbellulate +  and barbellate +
glabrous +  and strigose +
fertile +  and bisexual +
fertile +  and bisexual +
Tex. +, Mexico (Coahuila) +, Mexico (Nuevo León) +  and Mexico (Tamaulipas) +
50–200 m +
puberulent +, hispidulous +  and glabrate +
scabrellous +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Sandy soils, often with mesquite +
cymiform +, corymbiform +, discoid +  and radiate +
in loose , corymbiform arrays +  and singly +
indeterminate +
homogamous +  and heterogamous +
each +  and sessile +
1.2 cm12 mm <br />0.012 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
obpyramidal;hemispheric +
1 cm10 mm <br />0.01 m <br /> (1.8 cm18 mm <br />0.018 m <br />) +
sessile +, subpetiolate +  and petiolate +
deltate +
dentate to pinnatifid or palmatifid +  and entire +
2-carpellate +
entire +  and erose +
persistent +
1 +  and 10 +
acerose +  and subulate +
Flowering spring–summer. +
10 +  and 25 +
unequal +  and subequal +
Proc. Amer. Acad. Arts +
bearing subulate enations +, hairy +  and bristly +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.15 cm1.5 mm <br />0.0015 m <br />) +
16 +  and 30 +
spatulate +
0 cm0 mm <br />0 m <br /> (0.05 cm0.5 mm <br />5.0e-4 m <br />) +
exalbuminous +
glabrous +  and tomentulose +
appendaged +  and truncate +
hirsutulous +  and glabrous +
papillate +
Compositae +
Tetragonotheca texana +
Tetragonotheca +
species +
cylindric +
ampliate +
30 cm300 mm <br />0.3 m <br /> (120 cm1,200 mm <br />1.2 m <br />) +
150 cm1,500 mm <br />1.5 m <br /> (300 cm3,000 mm <br />3 m <br />) +
shrub +  and subshrub +