Helianthus nuttallii

Torrey & A. Gray

Fl. N. Amer. 2: 324. 1842.

Common names: Nuttall’s sunflower hélianthe de Nuttall
Treatment appears in FNA Volume 21. Treatment on page 166. Mentioned on page 146, 147, 165.

Perennials, 100–400 cm (rhizomatous). Stems (usually yellowbrown or greenish, sometimes glaucous) erect, glabrous, hispid, ± hirsute, or scabrous. Leaves cauline; all or mostly opposite to mostly alternate; petioles 0.5–1.5 cm; blades light to dark green, 3-nerved (distal to bases) ± lanceolate to ± ovate, 4–20 × 0.8–4 cm, bases cuneate, margins entire or ± serrate (flat), abaxial faces hispid to hispidulous or tomentulose to villous-tomentose, glanddotted. Heads 1–6. Peduncles 1–18 cm. Involucres hemispheric, 10–20 mm diam. Phyllaries 30–38 (loose, spreading), lanceolate to lanceovate, 8–16 × 1.5–3 mm, (margins ciliate) apices acute to acuminate, abaxial faces usually ± strigose, rarely glabrate, not glanddotted. Paleae 8–12 mm, 3-toothed. Ray-florets 10–21; laminae 20–25 mm (abaxial faces not glanddotted). Disc-florets 60+; corollas 5–7 mm, lobes yellow; anthers dark-brown to black, appendages yellow. Cypselae 3–5 mm, glabrate; pappi of 2 aristate scales 2.2–4.5 mm plus 0–2 lanceolate scales 0.5–1 mm. 2n = 34 (subspecies unknown).

Distribution

V21-402-distribution-map.gif

Alta., B.C., Man., Ont., Que., Sask., Ariz., Calif., Colo., Idaho, Iowa, Kans., Minn., Mo., Mont., N.Dak., N.Mex., Nebr., Nev., Okla., Oreg., S.Dak., Utah, Wash., Wyo.

Discussion

Subspecies 3 (3 in the flora).

Selected References

None.

Key

1 Leaves: abaxial faces tomentulose to villous-tomentose; phyllaries densely hairy (longer hairs 1+ mm) Helianthus nuttallii subsp. parishii
1 Leaves: abaxial faces hispid to hispidulous; phyllaries ± glabrate (longer hairs 0.5–1 mm). > 2
2 Plants usually 200–300 cm; leaves mostly alternate, blades narrowly to broadly lanceolate,apices acute to acuminate Helianthus nuttallii subsp. nuttallii
2 Plants usually 100–250 cm; leaves all or mostly opposite, blades lanceolate to nearly ovate, apices acute to obtuse Helianthus nuttallii subsp. rydbergii
... more about "Helianthus nuttallii"
glabrate +, strigose +, hispid +  and hispidulous or tomentulose +
not tailed +, rounded +  and obtuse +
dark-brown +  and black +
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 +
Torrey & A. Gray +
cuneate +
light +  and dark green +
4 cm40 mm <br />0.04 m <br /> (20 cm200 mm <br />0.2 m <br />) +
less lanceolate;more or less ovate +
0.8cm;4cm +
winged;ribbed;winged;ribbed +
tuberculate +  and rugose +
barbellulate +  and barbellate +
Nuttall’s sunflower +  and hélianthe de Nuttall +
reddish +  and yellow +
0.5 cm5 mm <br />0.005 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
compressed +  and obpyramidal +
fertile +  and bisexual +
fertile +  and bisexual +
Alta. +, B.C. +, Man. +, Ont. +, Que. +, Sask. +, Ariz. +, Calif. +, Colo. +, Idaho +, Iowa +, Kans. +, Minn. +, Mo. +, Mont. +, N.Dak. +, N.Mex. +, Nebr. +, Nev. +, Okla. +, Oreg. +, S.Dak. +, Utah +, Wash. +  and Wyo. +
hairy +  and glabrous +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
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 cm20 mm <br />0.02 m <br />) +
hemispheric +
2 cm20 mm <br />0.02 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
sessile +  and petiolate +
triangular +
serrate +  and entire +
2-carpellate +
3-toothed +
0.8 cm8 mm <br />0.008 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
persistent +
0 +  and 2 +
coroniform +
1 cm10 mm <br />0.01 m <br /> (18 cm180 mm <br />0.18 m <br />) +
0.5 cm5 mm <br />0.005 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
0.8 cm8 mm <br />0.008 m <br /> (1.6 cm16 mm <br />0.016 m <br />) +
30 +  and 38 +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
Fl. N. Amer. +
bearing subulate enations +, hairy +  and bristly +
flat;slightly convex +
lanceolate +  and aristate +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
exalbuminous +
procumbent +  and decumbent +
Scabrous (?) +, Hirsute (?) +, Hispid (?) +  and Glabrous (?) +
appendaged +  and truncate +
hirsutulous +  and glabrous +
papillate +
Undefined (tribe Undefined) subtribe Lagasceinae +
Helianthus nuttallii +
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 /> (400 cm4,000 mm <br />4 m <br />) +
shrub +  and subshrub +