Tetragonotheca ludoviciana

(Torrey & A. Gray) A. Gray ex E. Hall

Pl. Tex., 13. 1873.

Endemic
Basionym: Halea ludoviciana Torrey & A. Gray Fl. N. Amer. 2: 304. 1842
Treatment appears in FNA Volume 21. Treatment on page 178.

Stems sparsely tomentulose or glabrous. Leaves mostly cauline (distal connate-perfoliate); blades rounded-deltate to ovate, 8–12 × 4–9 cm, coarsely toothed. Ray-florets 12–13; laminae 8–18 mm. Cypselae ± quadrate, 4–6 mm; pappi of 16–30, obovate to spatulate scales 0.5–2 mm. 2n = 34.


Phenology: Flowering late spring–summer.
Habitat: Deep sandy soils with scrub oaks
Elevation: 10–100 m

Discussion

Selected References

None.

Lower Taxa

None.
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 +
(Torrey & A. Gray) A. Gray ex E. Hall +
decurrent +
Halea ludoviciana +
compound +  and simple +
8 cm80 mm <br />0.08 m <br /> (12 cm120 mm <br />0.12 m <br />) +
toothed;rounded-deltate;ovate +
4 cm40 mm <br />0.04 m <br /> (9 cm90 mm <br />0.09 m <br />) +
winged;ribbed;winged;ribbed +
tuberculate +  and rugose +
barbellulate +  and barbellate +
glabrous +  and strigose +
fertile +  and bisexual +
fertile +  and bisexual +
La. +  and Tex. +
10–100 m +
puberulent +, hispidulous +  and glabrate +
scabrellous +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Deep sandy soils with scrub oaks +
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 +
0.8 cm8 mm <br />0.008 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 +
obovate +  and spatulate +
Flowering late spring–summer. +
10 +  and 25 +
unequal +  and subequal +
bearing subulate enations +, hairy +  and bristly +
16 +  and 30 +
spatulate +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
exalbuminous +
glabrous +  and tomentulose +
appendaged +  and truncate +
hirsutulous +  and glabrous +
papillate +
Compositae +
Tetragonotheca ludoviciana +
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 +