Helianthus debilis subsp. debilis

Common names: Beach sunflower
Endemic
Treatment appears in FNA Volume 21. Treatment on page 151. Mentioned on page 143, 150.

Stems decumbent, glabrous or puberulent. Leaf-blades 3–10 cm, margins serrulate or shallowly, regularly serrate, abaxial faces sparsely, if at all, glanddotted. Peduncles 10–20 (–22) cm. Ray laminae 12–20 mm. Discs 11–14 mm diam. 2n = 34.


Phenology: Flowering year round.
Habitat: Coastal dunes
Elevation: 0–10 m

Discussion

Selected References

None.

Lower Taxa

None.
hispid +, glabrous +  and glabrate +
not tailed +, rounded +  and obtuse +
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 +
Nuttall +
cordate +  and truncate or broadly cuneate +
3 cm30 mm <br />0.03 m <br /> (10 cm100 mm <br />0.1 m <br />) +
2.5 cm25 mm <br />0.025 m <br /> (14 cm140 mm <br />0.14 m <br />) +
ovate;lanceovate;ovate;lanceovate;deltate-ovate +
1.8cm;13cm +
winged;ribbed;winged;ribbed +
tuberculate +  and rugose +
barbellulate +  and barbellate +
Beach sunflower +
reddish +  and yellow +
0.45 cm4.5 mm <br />0.0045 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
hairy +  and glabrous +
compressed +  and obpyramidal +
fertile +  and bisexual +
1.1 cm11 mm <br />0.011 m <br /> (1.4 cm14 mm <br />0.014 m <br />) +
fertile +  and bisexual +
0–10 m +
hairy +  and glabrous +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Coastal dunes +
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 /> (2.2 cm22 mm <br />0.022 m <br />) +
hemispheric +
1.2 cm12 mm <br />0.012 m <br /> (2.3 cm23 mm <br />0.023 m <br />) +
sessile +  and petiolate +
yellow;reddish +
triangular +
serrate +, shallowly +  and serrulate +
subentire +  and serrate +
2-carpellate +
0.75 cm7.5 mm <br />0.0075 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
persistent +
coroniform +
20 cm200 mm <br />0.2 m <br /> (22 cm220 mm <br />0.22 m <br />) +
10 cm100 mm <br />0.1 m <br /> (20 cm200 mm <br />0.2 m <br />) +
1 cm10 mm <br />0.01 m <br /> (7 cm70 mm <br />0.07 m <br />) +
Flowering year round. +
0.8 cm8 mm <br />0.008 m <br /> (1.7 cm17 mm <br />0.017 m <br />) +
20 +  and 30 +
0.1 cm1 mm <br />0.001 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
Trans. Amer. Philos. Soc., n. s. +
1.2 cm12 mm <br />0.012 m <br /> (2 cm20 mm <br />0.02 m <br />) +
bearing subulate enations +, hairy +  and bristly +
flat;slightly convex +
lance-linear +  and lanceolate +
0.12 cm1.2 mm <br />0.0012 m <br /> (0.25 cm2.5 mm <br />0.0025 m <br />) +
exalbuminous +
procumbent +  and decumbent +
decumbent +  and erect +
appendaged +  and truncate +
hirsutulous +  and glabrous +
papillate +
Undefined (tribe Undefined) subtribe Lagasceinae +
Helianthus debilis subsp. debilis +
Helianthus debilis +
subspecies +
campanulate +
toothed +  and entire +
300 cm3,000 mm <br />3 m <br /> (500 cm5,000 mm <br />5 m <br />) +
perennial +  and annual +
30 cm300 mm <br />0.3 m <br /> (200 cm2,000 mm <br />2 m <br />) +
shrub +  and subshrub +