Helianthus agrestis

Pollard

Proc. Biol. Soc. Wash. 13: 184. 1900.

Common names: Southeastern sunflower
IllustratedEndemic
Treatment appears in FNA Volume 21. Treatment on page 148. Mentioned on page 142, 149.

Annuals, 100 (–200+) cm. Stems erect, glabrous or glabrate (glaucous). Leaves mostly cauline; mostly opposite; petioles 0.5–1.2 cm; blades (often 3-nerved distal to bases) lanceolate, 6–11 × 0.7–1.9 cm, bases cuneate, margins ± serrate, faces scabrous, not glanddotted. Heads 1–15. Peduncles 2–8 cm. Involucres hemispheric, 10–15 mm diam. Phyllaries 15–25, lanceolate, 8–9 × 1.5–2 mm, (margins ciliate) apices acuminate, abaxial faces glabrate. Paleae 5–7, subentire to ± 3-toothed (apices purplish, glabrous). Ray-florets ca. 12; laminae 12–25 mm. Disc-florets 50+; corollas 3.5–4 mm, lobes reddish purple; anthers dark, appendages dark. Cypselae 2.5–3.2 mm, glabrous (± tuberculate); pappi of 2 aristate scales 1.5–2 mm. 2n = 34.


Phenology: Flowering late summer to fall.
Habitat: Mucky wet soils, marshes, pine flatwoods
Elevation: 0–50+ m

Discussion

Distinctive among species of Helianthus with an annual habit in having a combination of reddish disc corolla lobes and yellow style branches, H. agrestis is also characterized by its glabrate stems and phyllaries and by relatively long hairs on the petioles and basal margins of the leaves.

Selected References

None.

Lower Taxa

None.
... more about "Helianthus agrestis"
not tailed +, rounded +  and obtuse +
pale +  and dark +
connate +  and distinct +
acuminate +
subequal +
scarious +
usually ovate +  and lanceolate +
usually deltate +  and lanceolate +
spiciform +, paniculiform +  and corymbiform +
indeterminate +  and determinate +
Edward E. Schilling +
Pollard +
cuneate +
6 cm60 mm <br />0.06 m <br /> (11 cm110 mm <br />0.11 m <br />) +
lanceolate +
0.7 cm7 mm <br />0.007 m <br /> (1.9 cm19 mm <br />0.019 m <br />) +
winged;ribbed;winged;ribbed +
tuberculate +  and rugose +
barbellulate +  and barbellate +
Southeastern sunflower +
reddish +  and yellow +
0.35 cm3.5 mm <br />0.0035 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
compressed +  and obpyramidal +
fertile +  and bisexual +
fertile +  and bisexual +
Fla. +  and Ga. +
0–50+ m +
hairy +  and glabrous +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Mucky wet soils, marshes, pine flatwoods +
in more or less corymbiform , paniculiform or spiciform , arrays +  and singly +
indeterminate +
homogamous +  and heterogamous +
each +  and sessile +
1 cm10 mm <br />0.01 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
hemispheric +
1.2 cm12 mm <br />0.012 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
sessile +  and petiolate +
reddish purple +
triangular +
2-carpellate +
subentire;more or less 3-toothed +
persistent +
coroniform +
2 cm20 mm <br />0.02 m <br /> (8 cm80 mm <br />0.08 m <br />) +
0.5 cm5 mm <br />0.005 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
Flowering late summer to fall. +
0.8 cm8 mm <br />0.008 m <br /> (0.9 cm9 mm <br />0.009 m <br />) +
15 +  and 25 +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
Proc. Biol. Soc. Wash. +
bearing subulate enations +, hairy +  and bristly +
flat;slightly convex +
aristate +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
exalbuminous +
Illustrated +  and Endemic +
procumbent +  and decumbent +
glabrate +  and glabrous +
appendaged +  and truncate +
hirsutulous +  and glabrous +
papillate +
Undefined (tribe Undefined) subtribe Lagasceinae +
Helianthus agrestis +
Helianthus +
species +
campanulate +
toothed +  and entire +
100 cm1,000 mm <br />1 m <br /> (200 cm2,000 mm <br />2 m <br />) +
100 cm1,000 mm <br />1 m <br /> (?) +
2 cm20 mm <br />0.02 m <br /> (20 cm200 mm <br />0.2 m <br />) +
shrub +  and subshrub +