Flora of North America species comparison

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Helianthus resinosus

resindot sunflower
Habit 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, gland-dotted.
Peduncles

1–3 cm.
Involucres

hemispheric, 15–27 mm diam.
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.
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 gland-dotted (at least toward apices).
Heads

1–5.
Cypselae

5–7 mm, glabrate;

pappi of 2 aristate scales 2.4–2.6 mm.
Paleae

9–11 mm, 3-toothed (gland-dotted).
2n

= 102.

Helianthus resinosus
Phenology Flowering late summer–fall.
Habitat Roadsides, open areas
Elevation 0–900+ m (0–3000+ ft)
Distribution
from FNA
AL; FL; GA; MS; NC; SC
[WildflowerSearch map]
[BONAP county map]
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.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 21, p. 162.
Parent taxa Asteraceae > tribe Heliantheae > subtribe Helianthinae > Helianthus
Sibling taxa
H. agrestis, H. angustifolius, H. annuus, H. anomalus, H. argophyllus, H. arizonensis, H. atrorubens, H. bolanderi, H. californicus, H. carnosus, H. ciliaris, H. cusickii, H. debilis, H. decapetalus, H. deserticola, H. divaricatus, H. eggertii, H. exilis, H. floridanus, H. giganteus, H. glaucophyllus, H. gracilentus, H. grosseserratus, H. heterophyllus, H. hirsutus, H. laciniatus, H. laevigatus, H. longifolius, H. maximiliani, H. microcephalus, H. mollis, H. neglectus, H. niveus, H. nuttallii, H. occidentalis, H. paradoxus, H. pauciflorus, H. petiolaris, H. porteri, H. praecox, H. pumilus, H. radula, H. salicifolius, H. schweinitzii, H. silphioides, H. simulans, H. smithii, H. strumosus, H. tuberosus, H. verticillatus, H. ×laetiflorus
Name authority Small: Fl. S.E. U.S., 1269, 1340. (1903)
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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