Helianthus pumilus

Nuttall

Trans. Amer. Philos. Soc., n. s. 7: 366. 1841.

Common names: Little sunflower
Endemic
Treatment appears in FNA Volume 21. Treatment on page 168. Mentioned on page 147.

Perennials, 30–100 cm (taproots slightly thickened). Stems erect, hispid or strigose. Leaves cauline; opposite; petioles 0.4–3 cm; blades (ashy green, usually 3-nerved from bases) lanceolate to ovate, 4–15 × 1–5 cm, bases ± cuneate to truncate, margins entire or serrate, faces strigoso-hispid, glanddotted. Heads 1–6. Peduncles 0.5–5.5 cm. Involucres cylindric, 7–14 mm diam. Phyllaries 15–25 (loosely appressed), lanceolate to ovate, 3.5–7.5 × 2–3.5 mm, apices acute to acuminate, abaxial faces ± hispid or strigose (hairs whitish), glanddotted. Paleae 7–8 mm, entire or ± 3-toothed (apices acute to acuminate, hispid). Ray-florets 8–13; laminae 15–20 mm (abaxial faces glanddotted). Disc-florets 30+: corollas 5–6 mm, lobes yellow; anthers dark-brown to black, appendages dark. Cypselae 3–4 mm, sparsely hairy; pappi of 2 aristate scales 4–4.5 mm plus 0–4 deltate scales 0.5–1 mm. 2n = 34.


Phenology: Flowering late summer.
Habitat: Dry, rocky soil in open areas
Elevation: 1200–2700 m

Discussion

Selected References

None.

Lower Taxa

None.
... more about "Helianthus pumilus"
strigose +  and hispid +
not tailed +, rounded +  and obtuse +
dark-brown +  and black +
pale +  and dark +
connate +  and distinct +
acute;acuminate +
subequal +
scarious +
usually ovate +  and lanceolate +
usually deltate +  and lanceolate +
spiciform +, paniculiform +  and corymbiform +
indeterminate +  and determinate +
Edward E. Schilling +
Nuttall +
cuneate to truncate +  and cuneate +
4 cm40 mm <br />0.04 m <br /> (15 cm150 mm <br />0.15 m <br />) +
lanceolate;ovate +
1 cm10 mm <br />0.01 m <br /> (5 cm50 mm <br />0.05 m <br />) +
winged;ribbed;winged;ribbed +
tuberculate +  and rugose +
barbellulate +  and barbellate +
Little 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 +
Colo. +  and Wyo. +
1200–2700 m +
strigoso-hispid +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Dry, rocky soil in open areas +
in more or less corymbiform , paniculiform or spiciform , arrays +  and singly +
indeterminate +
homogamous +  and heterogamous +
each +  and sessile +
0.7 cm7 mm <br />0.007 m <br /> (1.4 cm14 mm <br />0.014 m <br />) +
1.5 cm15 mm <br />0.015 m <br /> (2 cm20 mm <br />0.02 m <br />) +
sessile +  and petiolate +
triangular +
serrate +  and entire +
2-carpellate +
3-toothed;entire +
0.7 cm7 mm <br />0.007 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
persistent +
0 +  and 4 +
coroniform +
0.5 cm5 mm <br />0.005 m <br /> (5.5 cm55 mm <br />0.055 m <br />) +
0.4 cm4 mm <br />0.004 m <br /> (3 cm30 mm <br />0.03 m <br />) +
Flowering late summer. +
0.35 cm3.5 mm <br />0.0035 m <br /> (0.75 cm7.5 mm <br />0.0075 m <br />) +
15 +  and 25 +
0.2 cm2 mm <br />0.002 m <br /> (0.35 cm3.5 mm <br />0.0035 m <br />) +
Trans. Amer. Philos. Soc., n. s. +
bearing subulate enations +, hairy +  and bristly +
flat;slightly convex +
deltate +  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 +
strigose +  and hispid +
appendaged +  and truncate +
hirsutulous +  and glabrous +
papillate +
Undefined (tribe Undefined) subtribe Lagasceinae +
Helianthus pumilus +
Helianthus +
species +
campanulate +
toothed +  and entire +
300 cm3,000 mm <br />3 m <br /> (500 cm5,000 mm <br />5 m <br />) +
30 cm300 mm <br />0.3 m <br /> (100 cm1,000 mm <br />1 m <br />) +
2 cm20 mm <br />0.02 m <br /> (20 cm200 mm <br />0.2 m <br />) +
shrub +  and subshrub +