Helianthus atrorubens

Linnaeus

Sp. Pl. 2: 906. 1753.

Common names: Purpledisc sunflower
IllustratedEndemic
Synonyms: Helianthus atrorubens var. alsodes Fernald Helianthus sparsifolius
Treatment appears in FNA Volume 21. Treatment on page 156. Mentioned on page 144, 157, 160, 161.

Perennials, 50–200 cm (with crown buds; nonflowering stems usually absent). Stems erect, proximally villous to strigoso-hispid, distally hispid or glabrate. Leaves mostly basal; opposite; petioles 4–25 cm (usually winged at least 1/2 their lengths); blades lanceolate to ovate, 7–26 × 3–10 cm, bases broadly cuneate to nearly truncate (often decurrent onto petioles), margins serrate to crenate, abaxial faces strigoso-hispid (hairs of midribs1+ mm), not glanddotted (cauline to 8 pairs proximal to heads, ovate to elliptic, smaller). Heads (1–) 3–15+. Peduncles 0.3–17 cm. Involucres broadly hemispheric, 9–16 mm diam. Phyllaries 15–22, broadly ovate to oblong, 7–9 × 4–5 mm, (margins ciliolate) apices obtuse to acute, sometimes mucronate, abaxial faces usually glabrous. Paleae 4–5.5 mm, ± 3-toothed to entire. Ray-florets 10–15; laminae 15–22 mm (abaxial faces not glanddotted). Disc-florets 75+; corollas 4–6 mm, lobes reddish; anthers dark, appendages dark (style-branches yellow). Cypselae 2.8–3 mm, glabrous or distally puberulent; pappi of 2 aristate scales 2.5–2.8 mm. 2n = 34.


Phenology: Flowering late summer–fall.
Habitat: Open mixed woods, roadsides
Elevation: 0–900 m

Distribution

V21-372-distribution-map.gif

Ala., Fla., Ga., Ky., La., N.J., N.C., S.C., Tenn., Va.

Discussion

Helianthus atrorubens and H. silphioides form a morphologically similar pair of species that share the distinctive feature of relatively broad, tightly appressed phyllaries with apices obtuse to acute. Helianthus atrorubens has a more easterly geographic distribution along the Piedmont and the Atlantic coastal plain and the southern Appalachian Mountains; distribution of H. silphioides is centered in the Ozark region. In general, H. silphioides differs in its usually well developed cauline leaves, and basal leaves with winged petioles that are less than half the total lengths. Involucres with phyllaries tightly appressed are also observed in H. occidentalis and H. pauciflorus subsp. pauciflorus, which differs in having the phyllary apices acute to acuminate as well as in usually having abaxial faces of leaves and ray laminae densely gland-dotted.

Selected References

None.

Lower Taxa

None.
... more about "Helianthus atrorubens"
glabrous +  and strigoso-hispid +
not tailed +, rounded +  and obtuse +
pale +  and dark +
connate +  and distinct +
mucronate;obtuse;acute +
subequal +
scarious +
usually ovate +  and lanceolate +
usually deltate +  and lanceolate +
spiciform +, paniculiform +  and corymbiform +
indeterminate +  and determinate +
Edward E. Schilling +
Linnaeus +
cuneate to nearly +  and cuneate +
7 cm70 mm <br />0.07 m <br /> (26 cm260 mm <br />0.26 m <br />) +
lanceolate;ovate +
3 cm30 mm <br />0.03 m <br /> (10 cm100 mm <br />0.1 m <br />) +
winged;ribbed;winged;ribbed +
tuberculate +  and rugose +
barbellulate +  and barbellate +
Purpledisc sunflower +
reddish +  and yellow +
0.4 cm4 mm <br />0.004 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
puberulent +  and glabrous +
compressed +  and obpyramidal +
fertile +  and bisexual +
fertile +  and bisexual +
Ala. +, Fla. +, Ga. +, Ky. +, La. +, N.J. +, N.C. +, S.C. +, Tenn. +  and Va. +
0–900 m +
hairy +  and glabrous +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Open mixed woods, roadsides +
in more or less corymbiform , paniculiform or spiciform , arrays +  and singly +
indeterminate +
homogamous +  and heterogamous +
each +  and sessile +
0.9 cm9 mm <br />0.009 m <br /> (1.6 cm16 mm <br />0.016 m <br />) +
hemispheric +
1.5 cm15 mm <br />0.015 m <br /> (2.2 cm22 mm <br />0.022 m <br />) +
sessile +  and petiolate +
triangular +
serrate +  and entire +
serrate +  and crenate +
2-carpellate +
less 3-toothed;entire +
0.4 cm4 mm <br />0.004 m <br /> (0.55 cm5.5 mm <br />0.0055 m <br />) +
persistent +
coroniform +
0.3 cm3 mm <br />0.003 m <br /> (17 cm170 mm <br />0.17 m <br />) +
4 cm40 mm <br />0.04 m <br /> (25 cm250 mm <br />0.25 m <br />) +
Flowering late summer–fall. +
0.7 cm7 mm <br />0.007 m <br /> (0.9 cm9 mm <br />0.009 m <br />) +
15 +  and 22 +
0.4 cm4 mm <br />0.004 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
bearing subulate enations +, hairy +  and bristly +
flat;slightly convex +
aristate +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.28 cm2.8 mm <br />0.0028 m <br />) +
exalbuminous +
Illustrated +  and Endemic +
procumbent +  and decumbent +
proximally villous +  and strigoso-hispid distally hispid or glabrate +
appendaged +  and truncate +
hirsutulous +  and glabrous +
papillate +
Helianthus atrorubens var. alsodes +  and Helianthus sparsifolius +
Helianthus atrorubens +
Helianthus +
species +
campanulate +
toothed +  and entire +
300 cm3,000 mm <br />3 m <br /> (500 cm5,000 mm <br />5 m <br />) +
50 cm500 mm <br />0.5 m <br /> (200 cm2,000 mm <br />2 m <br />) +
2 cm20 mm <br />0.02 m <br /> (20 cm200 mm <br />0.2 m <br />) +
shrub +  and subshrub +