Helianthus deserticola

Heiser

Proc. Indiana Acad. Sci. 70: 209, fig. 1. 1960.

Common names: Desert sunflower
Treatment appears in FNA Volume 21. Treatment on page 154. Mentioned on page 143, 155.
Revision as of 22:16, 29 July 2020 by imported>Volume Importer
(diff) ← Older revision | Latest revision (diff) | Newer revision → (diff)

Annuals, 10–40 cm. Stems (green or red) erect, densely hirsute and glanddotted. Leaves mostly cauline; mostly alternate; petioles 1–6 cm; blades lanceolate to lanceovate, 2.5–5 × 1–2 cm, bases cuneate, margins entire, abaxial faces hispid-hirsute, densely glanddotted. Heads 1–5. Peduncles 1–3 (–8) cm. Involucres hemispheric, 13–25 mm diam. Phyllaries 13–21, lanceolate to lanceovate, 7–19 × 1.5–2 mm (equaling or slightly surpassing discs), (margins ciliate) apices acuminate, abaxial faces hispid (hairs erect, often 1+ mm) glanddotted. Paleae 8–9 mm, ± 3-toothed (middle teeth equaling or slightly surpassing discs, apices yellowish-brown, usually hispid). Ray-florets 7–13; laminae 10–30 mm (abaxial faces glanddotted). Disc-florets 25+; corollas 5.5–6 mm, lobes reddish; anthers dark, appendages purplish (style-branches reddish). Cypselae 4–5 mm, pilose; pappi usually of 2 linear scales 1.6–2.5 mm plus 4–6 linear or ovate, erose scales 0.5–1 mm. 2n = 34.


Phenology: Flowering spring–fall.
Habitat: Dry, open areas
Elevation: 400–1500 m

Discussion

Helianthus deserticola is relatively uncommon; it is not federally listed. Abundant subsessile glands (“resin dots”) on stems, leaves, phyllaries, and abaxial faces of ray laminae help to distinguish H. deserticola from H. anomalus, with which it is sometimes lumped. L. H. Rieseberg (1991) demonstrated that it is of hybrid origin; parental species are H. annuus and H. petiolaris.

Selected References

None.

Lower Taxa

None.
... more about "Helianthus deserticola"
hispid +  and hispid-hirsute +
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 +
Heiser +
cuneate +
2.5 cm25 mm <br />0.025 m <br /> (5 cm50 mm <br />0.05 m <br />) +
lanceolate;lanceovate +
1 cm10 mm <br />0.01 m <br /> (2 cm20 mm <br />0.02 m <br />) +
winged;ribbed;winged;ribbed +
tuberculate +  and rugose +
barbellulate +  and barbellate +
Desert sunflower +
reddish +  and yellow +
0.55 cm5.5 mm <br />0.0055 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
compressed +  and obpyramidal +
fertile +  and bisexual +
fertile +  and bisexual +
Ariz. +, Nev. +  and Utah. +
400–1500 m +
hairy +  and glabrous +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Dry, open areas +
in more or less corymbiform , paniculiform or spiciform , arrays +  and singly +
indeterminate +
homogamous +  and heterogamous +
each +  and sessile +
1.3 cm13 mm <br />0.013 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
hemispheric +
1 cm10 mm <br />0.01 m <br /> (3 cm30 mm <br />0.03 m <br />) +
sessile +  and petiolate +
triangular +
2-carpellate +
3-toothed +
0.8 cm8 mm <br />0.008 m <br /> (0.9 cm9 mm <br />0.009 m <br />) +
persistent +
4 +  and 6 +
ovate +  and linear +
3 cm30 mm <br />0.03 m <br /> (8 cm80 mm <br />0.08 m <br />) +
1 cm10 mm <br />0.01 m <br /> (3 cm30 mm <br />0.03 m <br />) +
1 cm10 mm <br />0.01 m <br /> (6 cm60 mm <br />0.06 m <br />) +
Flowering spring–fall. +
0.7 cm7 mm <br />0.007 m <br /> (1.9 cm19 mm <br />0.019 m <br />) +
13 +  and 21 +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
Proc. Indiana Acad. Sci. +
bearing subulate enations +, hairy +  and bristly +
flat;slightly convex +
aristate +  and lanceolate +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
exalbuminous +
procumbent +  and decumbent +
appendaged +  and truncate +
hirsutulous +  and glabrous +
papillate +
Undefined (tribe Undefined) subtribe Lagasceinae +
Helianthus deserticola +
Helianthus +
species +
campanulate +
toothed +  and entire +
300 cm3,000 mm <br />3 m <br /> (500 cm5,000 mm <br />5 m <br />) +
10 cm100 mm <br />0.1 m <br /> (40 cm400 mm <br />0.4 m <br />) +
2 cm20 mm <br />0.02 m <br /> (20 cm200 mm <br />0.2 m <br />) +
shrub +  and subshrub +