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cucumberleaf sunflower, weak sunflower

lakeside sunflower

Habit Annuals or perennials, 30–200 cm (taprooted). Perennials, 10–60 cm, (with crown buds).
Stems

decumbent to erect, glabrous, hirsute, or puberulent.

erect, (unbranched) glabrous, eglandular.

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 basal; opposite (proximal) or alternate;

petioles obscure (intergrading with blades);

blades lanceolate to lance-linear or linear, 10–25 × 0.5–1.5 cm, bases cuneate, margins entire, faces glabrous, not gland-dotted (cauline 1–5 pairs, smaller).

Peduncles

9–50 cm.

5–10 cm.

Involucres

hemispheric, 10–22 mm diam.

broadly hemispheric, 17–25 mm diam.

Ray florets

11–20;

laminae 12–23 mm.

12–17;

laminae 20–40 mm, (abaxial faces not 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).

100+;

corollas 6–6.5 mm, lobes yellow;

anthers dark, appendages yellowish or dark.

Phyllaries

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

(green with purple veins) 25–30, ovate to lance-ovate, 8–16 × 3–5 mm, apices acuminate, abaxial faces usually glabrous, sometimes puberulent.

Heads

1–3.

1(–3).

Cypselae

2.5–3.2 mm, glabrous or sparsely hairy;

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

3 mm, glabrous;

pappi of 2 aristate scales 1.5–2 mm plus 2–4 erose scales 0.3–0.6 mm.

Paleae

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

8–9 mm, 3-toothed (middle teeth long-acuminate).

2n

= 34.

Helianthus debilis

Helianthus carnosus

Phenology Flowering early–late summer.
Habitat Wet prairies, flatwoods
Elevation 0–10+ m (0–0+ 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
FL
[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.)

Of conservation concern.

Helianthus carnosus is distinctive in morphology and is known from relatively few counties in northeastern Florida.

(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. 156.
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. angustifolius, H. annuus, H. anomalus, H. argophyllus, H. arizonensis, H. atrorubens, H. bolanderi, H. californicus, 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
Name authority Nuttall: Trans. Amer. Philos. Soc., n. s. 7: 367. (1841) Small: Torreya 2: 74. (1902)
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