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cucumberleaf sunflower, weak sunflower

swamp sneezeweed, swamp sunflower

Habit Annuals or perennials, 30–200 cm (taprooted). Perennials, 50–150+ cm (with crown buds, rhizomes absent or poorly developed).
Stems

decumbent to erect, glabrous, hirsute, or puberulent.

erect, usually ± hairy.

Leaves

mostly cauline; mostly alternate;

petioles 1–7 cm;

blades deltate-ovate, lance-ovate, or ovate, 2.5–14 × 1.8–13 cm, bases cordate to truncate or broadly cuneate, margins subentire to serrate, abaxial faces glabrate to hispid, not gland-dotted.

mostly cauline; opposite or alternate;

sessile or subsessile;

blades (3-nerved near bases) narrowly lanceolate to linear, 8–15 × 0.15–0.5(–1) cm, bases cuneate, margins entire (revolute, abaxial face sometimes obscured by rolled margins), abaxial faces strigose to hispid or hirsute, sometimes (adaxial not) gland-dotted.

Peduncles

9–50 cm.

5–15 cm.

Involucres

hemispheric, 10–22 mm diam.

shallowly hemispheric, 10–20 mm diam.

Ray florets

11–20;

laminae 12–23 mm.

10–20;

laminae 10–20 mm (abaxial faces gland-dotted).

Disc florets

30+;

corollas 4.5–5 mm, lobes usually reddish, sometimes yellow;

anthers dark, appendages dark (style branches usually reddish, rarely yellow).

75+;

corollas 4–4.5 mm, lobes yellow;

anthers dark brown or black, appendages dark (style branches usually yellow).

Phyllaries

20–30, lanceolate, 8–17 × 1–3 mm, apices acute to long-attenuate, abaxial faces glabrous or ± hispid, not gland-dotted.

25–32 (loose), lanceolate, 4–9 × 1–2 mm, apices acute to slightly acuminate, abaxial faces usually scabrous, rarely glabrous, usually gland-dotted.

Heads

1–3.

3–16.

Cypselae

2.5–3.2 mm, glabrous or sparsely hairy;

pappi of 2 lanceolate or lance-linear scales 1.2–2.5 mm.

2–3 mm, glabrate;

pappi of 2 aristate scales 1.5–2.1 mm.

Paleae

7.5–8 mm, apices 3-toothed (middle teeth acuminate, usually glabrous or hispid, sometimes ± villous or bearded).

(oblanceolate) 5.5–6.5 mm, entire or ± 3-toothed (apices purplish, mucronate, gland-dotted).

2n

= 34.

Helianthus debilis

Helianthus angustifolius

Phenology Flowering late summer–fall.
Habitat Open to shaded, usually moist places
Elevation 10–700 m (0–2300 ft)
Distribution
from FNA
AL; CT; FL; GA; LA; MA; MD; MI; MS; NC; NH; NY; PA; RI; SC; TX; VA; VT; WV
[WildflowerSearch map]
[BONAP county map]
from FNA
AL; AR; FL; GA; IA; IN; KY; LA; MD; MO; MS; NC; NJ; OH; OK; PA; SC; TN; TX; VA; WV
[WildflowerSearch map]
[BONAP county map]
Discussion

Subspecies 5 (5 in the flora).

C. B. Heiser (1956) placed 8 subspecies in Helianthus debilis; he noted that alternative taxonomic treatments might recognize these in as many as three species, or expand the single species to include H. petiolaris. Later, Heiser et al. (1969) separated three of the subspecies as H. praecox. Isozyme data (R. P. Wain 1982, 1983; L. H. Rieseberg and M. F. Doyle 1989) show that all are closely related. Documented hybridization with H. annuus further complicates the situation. The treatment by Heiser et al. is followed here.

Helianthus debilis is adventive beyond the Atlantic and Gulf coasts of the United States.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

The distal parts of Helianthus angustifolius are identical in appearance to those of H. simulans; plants of the latter are taller (200+ cm) and more robust. The leaves are not only narrower in H. angustifolius but also tend to be more strongly revolute (abaxial faces sometimes scarcely visible).

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Key
1. Stems decumbent; peduncles 9–20(–22) cm
→ 2
1. Stems erect; peduncles (15–)20–50 cm
→ 3
2. Stems glabrous or puberulent; leaf blades serrulate or shallowly, regularly serrate, abaxial faces sparsely, if at all, gland-dotted
subsp. debilis
2. Stems hirsute; leaf blades deeply, irregularly serrate, abaxial faces densely gland-dotted
subsp. vestitus
3. Leaves 8–14 cm; peduncles (relatively slender) 20–40 cm; discs 10–15(–17) mm diam
subsp. silvestris
3. Leaves 2.5–9 cm; peduncles (not notably slender) 10–50 cm; discs 14–20 mm diam
→ 4
4. Leaf blades usually deeply, irregularly serrate; peduncles 10–25(–30) cm; ray lami-nae 12–20(–22) mm
subsp. tardiflorus
4. Leaf blades usually shallowly, regularly serrate; peduncles 25–50 cm; ray laminae (15–)20–23 mm
subsp. cucumerifolius
Source FNA vol. 21, p. 150. FNA vol. 21, p. 164.
Parent taxa Asteraceae > tribe Heliantheae > subtribe Helianthinae > Helianthus 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. 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. resinosus, H. salicifolius, H. schweinitzii, H. silphioides, H. simulans, H. smithii, H. strumosus, H. tuberosus, H. verticillatus, H. ×laetiflorus
H. agrestis, 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. resinosus, H. salicifolius, H. schweinitzii, H. silphioides, H. simulans, H. smithii, H. strumosus, H. tuberosus, H. verticillatus, H. ×laetiflorus
Subordinate taxa
H. debilis subsp. cucumerifolius, H. debilis subsp. debilis, H. debilis subsp. silvestris, H. debilis subsp. tardiflorus, H. debilis subsp. vestitus
Synonyms H. angustifolius var. planifolius
Name authority Nuttall: Trans. Amer. Philos. Soc., n. s. 7: 367. (1841) Linnaeus: Sp. Pl. 2: 906. (1753)
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