Helianthus glaucophyllus

D. M. Smith

Brittonia 10: 192, fig. 1. 1958.

Common names: Whiteleaf sunflower
Endemic
Treatment appears in FNA Volume 21. Treatment on page 158. Mentioned on page 145.

Perennials, 100–200+ cm (rhizomatous). Stems erect, glabrous (glaucous). Leaves mostly cauline; opposite (proximal) or alternate; petioles 1–3 cm; blades (light to dark green, abaxially whitish, 3-nerved), lanceolate to lanceovate, 9–18 × 2.5–7 cm, bases abruptly narrowed, margins serrate, faces glabrous (abaxial) or sparsely scabrous (adaxial), not glanddotted (abaxial glaucous). Heads 3–15+. Peduncles 0.5–8 cm. Involucres hemispheric, 8–9 mm diam. Phyllaries 12–15, lanceolate to ovate, 8–9 × 1.8–3 mm, (margins ciliate) apices acuminate. Paleae 6.2–7.5 mm, 3-toothed (apices hairy). Ray-florets 5–8; laminae 12–14 mm (abaxial faces not glanddotted). Disc-florets 20–35; corollas 5–6 mm, lobes yellow; anthers dark, appendages dark. Cypselae 3.5–3.8 mm, glabrous; pappi of 2 aristate scales 3.2–3.5 mm. 2n = 34.


Phenology: Flowering late summer–fall.
Habitat: Mesic woodlands
Elevation: 700–1300 m

Discussion

Helianthus glaucophyllus is found in the southern Blue Ridge Province. It is distinguished from H. microcephalus, with which it shares relatively small heads, by glabrous or sparsely scabrous, glaucous leaves. Its closest relative may be H. decapetalus, which has larger heads and, usually, longer phyllaries.

Selected References

None.

Lower Taxa

None.
... more about "Helianthus glaucophyllus"
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 +
D. M. Smith +
narrowed +
9 cm90 mm <br />0.09 m <br /> (18 cm180 mm <br />0.18 m <br />) +
lanceolate;lanceovate +
2.5cm;7cm +
winged;ribbed;winged;ribbed +
tuberculate +  and rugose +
barbellulate +  and barbellate +
Whiteleaf sunflower +
reddish +  and yellow +
0.5 cm5 mm <br />0.005 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
compressed +  and obpyramidal +
fertile +  and bisexual +
fertile +  and bisexual +
N.C. +, S.C. +  and Tenn. +
700–1300 m +
scabrous +  and glabrous +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Mesic woodlands +
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 /> (0.9 cm9 mm <br />0.009 m <br />) +
hemispheric +
1.2 cm12 mm <br />0.012 m <br /> (1.4 cm14 mm <br />0.014 m <br />) +
sessile +  and petiolate +
alternate +  and opposite +
triangular +
2-carpellate +
3-toothed +
0.62 cm6.2 mm <br />0.0062 m <br /> (0.75 cm7.5 mm <br />0.0075 m <br />) +
persistent +
coroniform +
0.5 cm5 mm <br />0.005 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 />) +
Flowering late summer–fall. +
0.8 cm8 mm <br />0.008 m <br /> (0.9 cm9 mm <br />0.009 m <br />) +
12 +  and 15 +
0.18 cm1.8 mm <br />0.0018 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
bearing subulate enations +, hairy +  and bristly +
flat;slightly convex +
aristate +
0.32 cm3.2 mm <br />0.0032 m <br /> (0.35 cm3.5 mm <br />0.0035 m <br />) +
exalbuminous +
procumbent +  and decumbent +
appendaged +  and truncate +
hirsutulous +  and glabrous +
papillate +
Undefined (tribe Undefined) subtribe Lagasceinae +
Helianthus glaucophyllus +
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 +