Helianthus resinosus

Small

Fl. S.E. U.S., 1269, 1340. 1903.

Common names: Resindot sunflower
IllustratedEndemic
Treatment appears in FNA Volume 21. Treatment on page 162. Mentioned on page 146.

Perennials, 100–300 cm (rhizomatous). Stems (often reddish or purplish) erect, hirsute or villous. Leaves mostly cauline; mostly alternate; petioles 0.5–2 cm (broadly winged); blades lanceolate to ovate, 6.5–20 × 3.2–9 cm, bases gradually narrowed (onto petioles), margins entire or serrate, abaxial faces hirsute to tomentose, glanddotted. Heads 1–5. Peduncles 1–3 cm. Involucres hemispheric, 15–27 mm diam. Phyllaries 20–30 (squarrose to reflexed, at least tips), lanceolate, 10–21 × 3–5 mm (notably surpassing discs), apices acute to attenuate, abaxial faces hispid to villous, densely glanddotted (at least toward apices). Paleae 9–11 mm, 3-toothed (glanddotted). Ray-florets 10–20; laminae (often light yellow) 18–30 mm. Disc-florets 90+; corollas 8–8.5 mm, lobes yellow; anthers dark, appendages dark. Cypselae 5–7 mm, glabrate; pappi of 2 aristate scales 2.4–2.6 mm. 2n = 102.


Phenology: Flowering late summer–fall.
Habitat: Roadsides, open areas
Elevation: 0–900+ m

Distribution

V21-390-distribution-map.gif

Ala., Fla., Ga., Miss., N.C., S.C.

Discussion

Consistent with its epithet, Helianthus resinosus has abundant subsessile glandular hairs (“resin dots”) on its leaves, phyllaries, paleae, and ray laminae. It intergrades and has been reported to hybridize with H. tuberosus. It is cultivated and usually sold under the long-misapplied name H. tomentosus Michaux.

Selected References

None.

Lower Taxa

None.
... more about "Helianthus resinosus"
hispid +  and villous +
not tailed +, rounded +  and obtuse +
pale +  and dark +
connate +  and distinct +
acute;attenuate +
subequal +
scarious +
usually ovate +  and lanceolate +
usually deltate +  and lanceolate +
spiciform +, paniculiform +  and corymbiform +
indeterminate +  and determinate +
Edward E. Schilling +
narrowed +
6.5 cm65 mm <br />0.065 m <br /> (20 cm200 mm <br />0.2 m <br />) +
lanceolate;ovate +
3.2 cm32 mm <br />0.032 m <br /> (9 cm90 mm <br />0.09 m <br />) +
winged;ribbed;winged;ribbed +
tuberculate +  and rugose +
barbellulate +  and barbellate +
Resindot sunflower +
reddish +  and yellow +
0.8 cm8 mm <br />0.008 m <br /> (0.85 cm8.5 mm <br />0.0085 m <br />) +
compressed +  and obpyramidal +
fertile +  and bisexual +
fertile +  and bisexual +
Ala. +, Fla. +, Ga. +, Miss. +, N.C. +  and S.C. +
0–900+ m +
hairy +  and glabrous +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Roadsides, open areas +
in more or less corymbiform , paniculiform or spiciform , arrays +  and singly +
indeterminate +
homogamous +  and heterogamous +
each +  and sessile +
1.5 cm15 mm <br />0.015 m <br /> (2.7 cm27 mm <br />0.027 m <br />) +
hemispheric +
1.8 cm18 mm <br />0.018 m <br /> (3 cm30 mm <br />0.03 m <br />) +
sessile +  and petiolate +
triangular +
serrate +  and entire +
2-carpellate +
3-toothed +
0.9 cm9 mm <br />0.009 m <br /> (1.1 cm11 mm <br />0.011 m <br />) +
persistent +
coroniform +
1 cm10 mm <br />0.01 m <br /> (3 cm30 mm <br />0.03 m <br />) +
0.5 cm5 mm <br />0.005 m <br /> (2 cm20 mm <br />0.02 m <br />) +
Flowering late summer–fall. +
1 cm10 mm <br />0.01 m <br /> (2.1 cm21 mm <br />0.021 m <br />) +
20 +  and 30 +
0.3 cm3 mm <br />0.003 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
Fl. S.E. U.S., +
bearing subulate enations +, hairy +  and bristly +
flat;slightly convex +
aristate +
0.24 cm2.4 mm <br />0.0024 m <br /> (0.26 cm2.6 mm <br />0.0026 m <br />) +
exalbuminous +
Illustrated +  and Endemic +
procumbent +  and decumbent +
villous +  and hirsute +
appendaged +  and truncate +
hirsutulous +  and glabrous +
papillate +
Undefined (tribe Undefined) subtribe Lagasceinae +
Helianthus resinosus +
Helianthus +
species +
campanulate +
toothed +  and entire +
300 cm3,000 mm <br />3 m <br /> (500 cm5,000 mm <br />5 m <br />) +
100 cm1,000 mm <br />1 m <br /> (300 cm3,000 mm <br />3 m <br />) +
2 cm20 mm <br />0.02 m <br /> (20 cm200 mm <br />0.2 m <br />) +
shrub +  and subshrub +