Helianthus niveus subsp. tephrodes

(A. Gray) Heiser

Mem. Torrey Bot. Club 22(3): 43. 1969.

Common names: Algodones or Algodones dunes sunflower
Conservation concern
Basionym: Helianthus tephrodes A. Gray in W. H. Emory, Rep. U.S. Mex. Bound. 2(1): 90. 1859
Treatment appears in FNA Volume 21. Treatment on page 154.

Annuals or perennials, 50–150 cm (taproots stout). Stems erect or decumbent, sericeo-villous (hairs white). Leaves mostly cauline; mostly alternate; petioles 1.5–3.5 cm; blades deltate or deltate-ovate, 3–7 × 2–4 cm, bases cuneate, margins entire or serrulate, abaxial faces densely sericeous, glanddotted. Heads 1–3. Peduncles 4–17 cm. Involucres hemispheric, 8–28 mm diam. Phyllaries 18–21, lanceolate, 8–10 × 1–3.5 mm, apices shortly attenuate, abaxial faces densely white-canescent. Paleae 8–11 mm, subentire to 3-toothed. Ray-florets 10–13; laminae 16–25 mm. Disc-florets 50+; corollas 4.5–6 mm, lobes reddish; anthers brownish red, appendages reddish (style-branches reddish). Cypselae 4–8 mm, ± villous; pappi of 2 (–3) lanceolate scales 1.5–3 mm plus 2–4 obtuse scales 0.5–1 mm. 2n = 34.


Phenology: Flowering fall–spring.
Habitat: Sand hills
Elevation: 50–300 m

Distribution

V21-364-distribution-map.gif

Ariz., Calif., Mexico (Sonora)

Discussion

Of conservation concern.

Subspecies tephrodes differs from subsp. niveus, which is not known to occur north of Mexico, by having less densely hairy phyllaries and generally broader leaves (larger leaves more than 3 cm broad). Both differ from H. petiolaris subsp. canescens (H. niveus subsp. canescens) by lacking the conspicuous white-villous tufts (“beard”) of the median cusp of the paleae in the center of the head that characterize H. petiolaris.

Subspecies tephrodes is in the Center for Plant Conservation’s National Collection of Endangered Plants.

Selected References

None.

Lower Taxa

None.
white-canescent +  and sericeous +
not tailed +, rounded +  and obtuse +
brownish red +
pale +  and dark +
connate +  and distinct +
attenuate +
subequal +
scarious +
usually ovate +  and lanceolate +
usually deltate +  and lanceolate +
spiciform +, paniculiform +  and corymbiform +
indeterminate +  and determinate +
Edward E. Schilling +
(A. Gray) Heiser +
cuneate +
Helianthus tephrodes +
3 cm30 mm <br />0.03 m <br /> (7 cm70 mm <br />0.07 m <br />) +
deltate-ovate;deltate +
2 cm20 mm <br />0.02 m <br /> (4 cm40 mm <br />0.04 m <br />) +
winged;ribbed;winged;ribbed +
tuberculate +  and rugose +
barbellulate +  and barbellate +
Algodones or Algodones dunes sunflower +
reddish +  and yellow +
0.45 cm4.5 mm <br />0.0045 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
compressed +  and obpyramidal +
fertile +  and bisexual +
fertile +  and bisexual +
Ariz. +, Calif. +  and Mexico (Sonora) +
50–300 m +
hairy +  and glabrous +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Sand hills +
in more or less corymbiform , paniculiform or spiciform , arrays +  and singly +
indeterminate +
homogamous +  and heterogamous +
each +  and sessile +
0.8 cm8 mm <br />0.008 m <br /> (2.8 cm28 mm <br />0.028 m <br />) +
hemispheric +
1.6 cm16 mm <br />0.016 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
sessile +  and petiolate +
triangular +
serrulate +  and entire +
2-carpellate +
subentire;3-toothed +
0.8 cm8 mm <br />0.008 m <br /> (1.1 cm11 mm <br />0.011 m <br />) +
persistent +
2 +  and 4 +
coroniform +
4 cm40 mm <br />0.04 m <br /> (17 cm170 mm <br />0.17 m <br />) +
1.5 cm15 mm <br />0.015 m <br /> (3.5 cm35 mm <br />0.035 m <br />) +
Flowering fall–spring. +
0.8 cm8 mm <br />0.008 m <br /> (1 cm10 mm <br />0.01 m <br />) +
18 +  and 21 +
0.1 cm1 mm <br />0.001 m <br /> (0.35 cm3.5 mm <br />0.0035 m <br />) +
Mem. Torrey Bot. Club +
bearing subulate enations +, hairy +  and bristly +
flat;slightly convex +
obtuse +  and lanceolate +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
exalbuminous +
Conservation concern +
procumbent +  and decumbent +
decumbent +  and erect +
sericeo-villous +
appendaged +  and truncate +
hirsutulous +  and glabrous +
papillate +
Undefined (tribe Undefined) subtribe Lagasceinae +
Helianthus niveus subsp. tephrodes +
Helianthus niveus +
subspecies +
campanulate +
toothed +  and entire +
300 cm3,000 mm <br />3 m <br /> (500 cm5,000 mm <br />5 m <br />) +
perennial +  and annual +
50 cm500 mm <br />0.5 m <br /> (150 cm1,500 mm <br />1.5 m <br />) +
2 cm20 mm <br />0.02 m <br /> (20 cm200 mm <br />0.2 m <br />) +
shrub +  and subshrub +