Heterotheca subaxillaris subsp. latifolia

(Buckley) Semple

Sida 21: 759. 2004.

Basionym: Heterotheca latifolia Buckley Proc. Acad. Nat. Sci. Philadelphia 13: 459. 1862
Synonyms: Heterotheca latifolia var. arkansana B. Wagenknecht Heterotheca latifolia var. macgregoris B. Wagenknecht Heterotheca psammophila Heterotheca subaxillaris var. latifolia (Buckley) Gandhi & R. D. Thomas Heterotheca subaxillaris var. petiolaris Benke
Treatment appears in FNA Volume 20. Treatment on page 235.

Outer and mid phyllaries without distinct apical tuft of hairs (sometimes distally with 1–2 coarse, scabro-strigose hairs), abaxial faces sometimes sparsely short-hairy, moderately to densely stipitate-glandular. 2n =18.


Phenology: Flowering (Mar–)May–Dec.
Habitat: Sandy, clay and gravelly soils, grasslands, prairies, disturbed ground, roadsides, vacant lots, fields, open areas in pine and oak woods and scrub or mesquite scrub
Elevation: 0–1800 m

Distribution

V20-516-distribution-map.gif

Ala., Ariz., Ark., Calif., Colo., Conn., Del., Ga., Ill., Ind., Iowa, Kans., Ky., La., Md., Miss., Mo., Nebr., Nev., N.J., N.Mex., N.Y., N.C., Okla., Pa., S.C., Tenn., Tex., Utah, Va., Mexico

Discussion

Subspecies latifolia occurs over much of the central and southern United States into Mexico. It lacks tufts of coarse hairs at the tip of the phyllaries (sometimes 1–2 may be present distally), which are sometimes densely stipitate-glandular. Stem height is variable throughout the range. Robust plants (to 2 m) occurring in Arizona, New Mexico, and adjacent Texas have been treated as Heterotheca psammophila, but they grade into those treated as subsp. latifolia farther east on the prairies and eastward. The latter have been split into weakly defined varieties not recognized here. The more western plants tend to have more linear-lanceolate, more densely glandular phyllaries. Plants from Long Island, New York, have 0–3(–6) hairs distally on the phyllaries.

Selected References

None.

Lower Taxa

None.

"[" is not declared as a valid unit of measurement for this property."]" is not declared as a valid unit of measurement for this property.

stipitate-glandular +  and short-hairy +
not tailed +, rounded +  and obtuse +
distinct +
subequal +
scarious +
usually triangular +  and linear +
usually deltate +  and lanceolate +
indeterminate +  and determinate +
John C. Semple +
(Buckley) Semple +
not clasping +  and subclasping +
cordate +, cuneate +  and attenuate +
Heterotheca latifolia +
compound +  and simple +
1 cm10 mm <br />0.01 m <br /> (9 cm90 mm <br />0.09 m <br />) +
ovate;lanceolate +
reduced +
2mm;20mm +
rugulose +  and muricate +
branched +  and corymbo-paniculiform +
ascending;spreading +
barbellulate +  and barbellate +
0.4 cm4 mm <br />0.004 m <br /> (0.9 cm9 mm <br />0.009 m <br />) +
rhizomatous +  and taprooted +
not 2-lipped +  and actinomorphic +
ampliate +
0.2 cm2 mm <br />0.002 m <br /> (0.9 cm9 mm <br />0.009 m <br />) +
fertile +  and bisexual +
Ala. +, Ariz. +, Ark. +, Calif. +, Colo. +, Conn. +, Del. +, Ga. +, Ill. +, Ind. +, Iowa +, Kans. +, Ky. +, La. +, Md. +, Miss. +, Mo. +, Nebr. +, Nev. +, N.J. +, N.Mex. +, N.Y. +, N.C. +, Okla. +, Pa. +, S.C. +, Tenn. +, Tex. +, Utah +, Va. +  and Mexico +
0–1800 m +
strigose +, glabrous +  and slightly strigose +
compressed +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Sandy, clay and gravelly soils, grasslands, prairies, disturbed ground, roadsides, vacant lots, fields, open areas in pine and oak woods and scrub or mesquite scrub +
scabro-strigose +
paniculiform +
in corymbiform arrays +  and singly +
indeterminate +
heterogamous +  and homogamous +
each +  and sessile +
tan;rusty brown +
attenuate +  and clavate +
0.8 cm8 mm <br />0.008 m <br /> (1 cm10 mm <br />0.01 m <br />) +
hemispheric;campanulate +
0.4 cm4 mm <br />0.004 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
0.7 cm7 mm <br />0.007 m <br /> (0.9 cm9 mm <br />0.009 m <br />) +
brown +  and black +
persisting +
withered +  and flowering +
cauline +, basal +  and mid +
erect;spreading +
lanceolate +, triangular +  and deltate +
strigoso-ciliate +  and long-ciliate +
entire +  and serrate +
stipitate-glandular +  and strigose +
undulate +  and flat +
2-carpellate +
tan to rust +
stipitate-glandular +  and hispido-strigose +
0.2 cm2 mm <br />0.002 m <br /> (3.5 cm35 mm <br />0.035 m <br />) +
Flowering (Mar–)May–Dec. +
lanceolate +
ovate-oblanceolate +
ovate +  and lanceolate +
glabrous +  and sparsely short-strigose +
bearing subulate enations +, hairy +  and bristly +
subulate;convex +
2 +  and 3 +
triangular +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.25 cm2.5 mm <br />0.0025 m <br />) +
3 +  and 40 +
linear +  and triangular +
0.025 cm0.25 mm <br />2.5e-4 m <br /> (0.06 cm0.6 mm <br />6.0e-4 m <br />) +
exalbuminous +
Illustrated +
1 +  and 4 +
appendaged +  and truncate +
papillate +  and smooth +
Heterotheca latifolia var. arkansana +, Heterotheca latifolia var. macgregoris +, Heterotheca psammophila +, Heterotheca subaxillaris var. latifolia +  and Heterotheca subaxillaris var. petiolaris +
Heterotheca subaxillaris subsp. latifolia +
Heterotheca subaxillaris +
subspecies +
60 cm600 mm <br />0.6 m <br /> (200 cm2,000 mm <br />2 m <br />) +
biennial +  and annual +
10 cm100 mm <br />0.1 m <br /> (200 cm2,000 mm <br />2 m <br />) +
tree +, shrub +  and subshrub +