Helianthus floridanus

A. Gray ex Chapman

Fl. South. U.S. ed. 2, 629. 1883.

Common names: Florida sunflower
Endemic
Treatment appears in FNA Volume 21. Treatment on page 164. Mentioned on page 145, 147.

Perennials, 100–200 cm (rhizomatous). Stems (green) erect, hispid to hispidulous. Leaves cauline; usually opposite or alternate, rarely whorled; petioles 0–1 cm; blades (1-nerved or 3-nerved) lanceolate to elliptic or lanceovate, 4–15 × 0.5–6 cm, bases rounded to cuneate, margins entire or serrulate (often undulate, often ± revolute), faces ± scabrous to tomentulose and glanddotted (abaxial) or scabrous (adaxial). Heads 1–6. Peduncles 2–15 cm. Involucres ± hemispheric, 12–19 × 7–9 mm. Phyllaries 33–38, lanceolate, 5–9 × 1.5–3 mm, apices (at least outer) obtuse, abaxial faces hispidulous to hispid, glanddotted. Paleae 4.5–6 mm, entire or weakly 3-toothed (apices purplish, glabrate to puberulent, often glanddotted). Ray-florets 10–20; laminae 20–25 mm (abaxial faces glanddotted). Disc-florets 90+; corollas 4–5 mm, lobes usually reddish, sometimes yellow; anthers dark-brown or black, appendages dark (style-branches yellow). Cypselae 2.5–3 mm, glabrous; pappi of 2 aristate scales 1.5–2.2 mm. 2n = 34.


Phenology: Flowering late summer to fall.
Habitat: Sandy, open areas
Elevation: 0–50 m

Distribution

V21-396-distribution-map.gif

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

Discussion

Helianthus floridanus is similar to and intergrades with H. angustifolius, which has narrower leaves, and H. simulans, which is more robust and has longer leaves without undulate margins.

Selected References

None.

Lower Taxa

None.
... more about "Helianthus floridanus"
hispidulous +  and hispid +
not tailed +, rounded +  and obtuse +
black +  and dark-brown +
pale +  and dark +
connate +  and distinct +
subequal +
scarious +
usually ovate +  and lanceolate +
usually deltate +  and lanceolate +
spiciform +, paniculiform +  and corymbiform +
indeterminate +  and determinate +
Edward E. Schilling +
A. Gray ex Chapman +
rounded +  and cuneate +
4 cm40 mm <br />0.04 m <br /> (15 cm150 mm <br />0.15 m <br />) +
lanceolate;elliptic or lanceovate +
0.5cm;6cm +
winged;ribbed;winged;ribbed +
tuberculate +  and rugose +
barbellulate +  and barbellate +
Florida sunflower +
reddish +  and yellow +
0.4 cm4 mm <br />0.004 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
compressed +  and obpyramidal +
fertile +  and bisexual +
fertile +  and bisexual +
Ala. +, Fla. +, Ga. +, La. +, N.C. +  and S.C. +
0–50 m +
less scabrous +  and tomentulose +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Sandy, open areas +
in more or less corymbiform , paniculiform or spiciform , arrays +  and singly +
indeterminate +
homogamous +  and heterogamous +
each +  and sessile +
0.5 cm5 mm <br />0.005 m <br /> (4 cm40 mm <br />0.04 m <br />) +
1.2 cm12 mm <br />0.012 m <br /> (1.9 cm19 mm <br />0.019 m <br />) +
hemispheric +
0.7 cm7 mm <br />0.007 m <br /> (0.9 cm9 mm <br />0.009 m <br />) +
2 cm20 mm <br />0.02 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
sessile +  and petiolate +
whorled +, alternate +  and opposite +
yellow;reddish +
triangular +
serrulate +  and entire +
2-carpellate +
3-toothed;entire +
0.45 cm4.5 mm <br />0.0045 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
persistent +
coroniform +
2 cm20 mm <br />0.02 m <br /> (15 cm150 mm <br />0.15 m <br />) +
0 cm0 mm <br />0 m <br /> (1 cm10 mm <br />0.01 m <br />) +
Flowering late summer to fall. +
0.5 cm5 mm <br />0.005 m <br /> (0.9 cm9 mm <br />0.009 m <br />) +
33 +  and 38 +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
Fl. South. U.S. ed. +
bearing subulate enations +, hairy +  and bristly +
flat;slightly convex +
aristate +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.22 cm2.2 mm <br />0.0022 m <br />) +
exalbuminous +
procumbent +  and decumbent +
appendaged +  and truncate +
hirsutulous +  and glabrous +
papillate +
Undefined (tribe Undefined) subtribe Lagasceinae +
Helianthus floridanus +
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 /> (200 cm2,000 mm <br />2 m <br />) +
shrub +  and subshrub +