Rudbeckia texana

(Perdue) P. B. Co×& Urbatsch

Phytologia 67: 366. 1989.

Common names: Texas coneflower
Endemic
Basionyms: Rudbeckia nitida var. texana Perdue Rhodora 64: 328. 1962
Treatment appears in FNA Volume 21. Treatment on page 52. Mentioned on page 47.

Perennials, to 150 cm (rhizomatous, roots fibrous). Leaves green, blades elliptic to lanceolate (not lobed), ± leathery, bases attenuate to cuneate, margins entire, serrate, or toothed, apices acute to acuminate, faces glabrous or sparsely hairy; basal 15–50 × 3–9 cm; cauline petiolate or sessile, 5–50 × 2–12 cm. Heads borne singly or (2–5) in ± corymbiform arrays. Phyllaries to 2.5 cm (margins sometimes ciliate). Receptacles ovoid to ellipsoid; paleae 6–8 mm, apices acute (appressed in young heads), abaxial tips hairy. Ray-florets 10–16; laminae oblong to oblanceolate, 20–50 × 8–12 mm, abaxially hairy. Discs 20–45 × 10–20 mm. Disc-florets 200–500+; corollas proximally greenish yellow, distally maroon, 3.5–5 mm; style-branches ca. 2 mm, apices acute. Cypselae 5–7.5 mm; pappi coroniform, to 1.5 mm. 2n = 36.


Phenology: Flowering late spring–fall.
Habitat: Swales, prairies, ditches, bayous
Elevation: 0–50 m

Discussion

Rudbeckia texana grows in western Louisiana and eastern Texas.

Selected References

None.

Lower Taxa

None.

... more about "Rudbeckia texana"
not tailed +, rounded +  and obtuse +
connate +  and distinct +
subequal +
scarious +
usually ovate +  and lanceolate +
usually deltate +  and lanceolate +
indeterminate +  and determinate +
Lowell E. Urbatsch +  and Patricia B. Cox +
(Perdue) P. B. Co×& Urbatsch +
sessile +  and petiolate +
15 cm150 mm <br />0.15 m <br /> (50 cm500 mm <br />0.5 m <br />) +
3 cm30 mm <br />0.03 m <br /> (9 cm90 mm <br />0.09 m <br />) +
attenuate +  and cuneate +
Rudbeckia nitida var. texana +
compound +  and simple +
elliptic;lanceolate +
winged;ribbed;winged;ribbed +
tuberculate +  and rugose +
barbellulate +  and barbellate +
sessile +  and petiolate +
sessile +  and petiolate +
5 cm50 mm <br />0.05 m <br /> (50 cm500 mm <br />0.5 m <br />) +
2cm +  and 12cm +
Texas coneflower +
maroon +  and greenish yellow +
0.35 cm3.5 mm <br />0.0035 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
0.3 cm3 mm <br />0.003 m <br /> (0.35 cm3.5 mm <br />0.0035 m <br />) +
hairy +  and glabrous +
flattened +, fusiform-terete +  and obpyramidal +
fertile +  and bisexual +
6 cm60 mm <br />0.06 m <br /> (8 cm80 mm <br />0.08 m <br />) +
fertile +  and bisexual +
2 cm20 mm <br />0.02 m <br /> (4.5 cm45 mm <br />0.045 m <br />) +
10mm;20mm +
La. +  and Tex. +
0–50 m +
hairy +  and glabrous +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Swales, prairies, ditches, bayous +
discoid +  and radiate +
indeterminate +
homogamous +  and heterogamous +
each +  and sessile +
0.1 cm1 mm <br />0.001 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
fusiform;turbinate or broadly campanulate +
20mm;50mm +
oblong +  and oblanceolate +
8mm;12mm +
sessile +  and petiolate +
deltate +  and lance-linear +
toothed +  and serrate +
2-carpellate +
0.6 cm6 mm <br />0.006 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
persistent +
0 +  and 2 +
coroniform +
0 cm0 mm <br />0 m <br /> (0.15 cm1.5 mm <br />0.0015 m <br />) +
Flowering late spring–fall. +
3 +  and 21 +
0 cm0 mm <br />0 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
bearing subulate enations +, hairy +  and bristly +
pitted +  and smooth +
ovoid;ellipsoid +
connate +  and distinct +
2 +  and 6 +
unequal +
exalbuminous +
purplish +, bluish green +  and green +
appendaged +  and truncate +
hirsutulous +  and glabrous +
papillate +
0.3 cm3 mm <br />0.003 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
Rudbeckia subg. Macrocline +
Rudbeckia texana +
Rudbeckia sect. Macrocline +
species +
cylindric +
serrate +, dentate +  and entire +
0 cm0 mm <br />0 m <br /> (150 cm1,500 mm <br />1.5 m <br />) +
shrub +  and subshrub +