Helianthus pauciflorus subsp. pauciflorus

Common names: Stiff sunflower hélianthe rigide
Endemic
Synonyms: Helianthus laetiflorus var. rigidus (Cassini) Fernald Helianthus rigidus (Cassini) Desfontaines
Treatment appears in FNA Volume 21. Treatment on page 161. Mentioned on page 156, 160.

Plants 80–200 cm. Leaves usually alternate distally; blades oblong-lanceolate to lanceovate, 8–27 cm, apices acuminate.


Phenology: Flowering late summer–fall.
Habitat: Dry to moderately wet prairies, open places
Elevation: 50–600+ m

Distribution

V21-386-distribution-map.gif

Alta., B.C., Man., Ont., P.E.I., Que., Sask., Ark., Conn., Ga., Ill., Ind., Iowa, Kans., Ky., Maine, Mass., Mich., Minn., Mo., Mont., Nebr., N.H., N.J., N.Dak., Okla., R.I., S.Dak., Tex., Vt., Va., Wis.

Discussion

Subspecies pauciflorus is introduced in Ontario, and probably in all eastern Canada.

Selected References

None.

Lower Taxa

None.
glabrate +  and hispid +
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 +
Nuttall +
cuneate +
5 cm50 mm <br />0.05 m <br /> (27 cm270 mm <br />0.27 m <br />) +
oblong-lanceolate;lanceovate +
8 cm80 mm <br />0.08 m <br /> (27 cm270 mm <br />0.27 m <br />) +
2cm;6cm +
winged;ribbed;winged;ribbed +
tuberculate +  and rugose +
barbellulate +  and barbellate +
Stiff sunflower +  and hélianthe rigide +
reddish +  and yellow +
0.65 cm6.5 mm <br />0.0065 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. +, P.E.I. +, Que. +, Sask. +, Ark. +, Conn. +, Ga. +, Ill. +, Ind. +, Iowa +, Kans. +, Ky. +, Maine +, Mass. +, Mich. +, Minn. +, Mo. +, Mont. +, Nebr. +, N.H. +, N.J. +, N.Dak. +, Okla. +, R.I. +, S.Dak. +, Tex. +, Vt. +, Va. +  and Wis. +
50–600+ m +
hairy +  and glabrous +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Dry to moderately wet prairies, open places +
in more or less corymbiform , paniculiform or spiciform , arrays +  and singly +
indeterminate +
homogamous +  and heterogamous +
each +  and sessile +
1.5 cm15 mm <br />0.015 m <br /> (2.3 cm23 mm <br />0.023 m <br />) +
hemispheric +
2 cm20 mm <br />0.02 m <br /> (3.5 cm35 mm <br />0.035 m <br />) +
sessile +  and petiolate +
yellow;reddish +
triangular +
serrate +  and entire +
serrate +  and subentire +
2-carpellate +
shallowly 3-toothed;subentire +
0.9 cm9 mm <br />0.009 m <br /> (1 cm10 mm <br />0.01 m <br />) +
persistent +
1 +  and 4 +
coroniform +
3 cm30 mm <br />0.03 m <br /> (12 cm120 mm <br />0.12 m <br />) +
0 cm0 mm <br />0 m <br /> (1 cm10 mm <br />0.01 m <br />) +
Flowering late summer–fall. +
0.6 cm6 mm <br />0.006 m <br /> (1 cm10 mm <br />0.01 m <br />) +
25 +  and 35 +
0.3 cm3 mm <br />0.003 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
Gen. N. Amer. Pl. +
bearing subulate enations +, hairy +  and bristly +
flat;slightly convex +
aristate +
0.45 cm4.5 mm <br />0.0045 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
exalbuminous +
0.03 cm0.3 mm <br />3.0e-4 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
procumbent +  and decumbent +
appendaged +  and truncate +
hirsutulous +  and glabrous +
papillate +
Helianthus laetiflorus var. rigidus +  and Helianthus rigidus +
Helianthus pauciflorus subsp. pauciflorus +
Helianthus pauciflorus +
subspecies +
campanulate +
toothed +  and entire +
300 cm3,000 mm <br />3 m <br /> (500 cm5,000 mm <br />5 m <br />) +
50 cm500 mm <br />0.5 m <br /> (200 cm2,000 mm <br />2 m <br />) +