Silphium radula var. radula

Endemic
Synonyms: Silphium reverchonii Bush Silphium simpsonii var. wrightii
Treatment appears in FNA Volume 21. Treatment on page 80.

Plants 50–250 cm. Basal leaves caducous. Heads to 30. Ray-florets 20–30+. Disc-florets 125–175.2n = 14.


Phenology: Flowering summer.
Habitat: Prairies, fencerows, roadsides
Elevation: 0–400 m

Distribution

V21-183-distribution-map.gif

Ark., Kans., La., Mo., Okla., Tex.

Discussion

Selected References

None.

Lower Taxa

None.

"broader" is not a number.

not tailed +, rounded +  and obtuse +
connate +  and distinct +
acute;acuminate;acute +
subequal +
scarious +
usually ovate +  and lanceolate +
usually deltate +  and lanceolate +
racemiform +  and paniculiform +
indeterminate +  and determinate +
Jennifer A. Clevinger +
Nuttall +
bristlelike +
coroniform +
attenuate +  and round +
compound +  and simple +
2 cm20 mm <br />0.02 m <br /> (22 cm220 mm <br />0.22 m <br />) +
lanceolate;ovate +
0.5 cm5 mm <br />0.005 m <br /> (8 cm80 mm <br />0.08 m <br />) +
winged;ribbed;winged;ribbed +
tuberculate +  and rugose +
barbellulate +  and barbellate +
sessile +  and petiolate +
opposite +  and alternate +
1 cm10 mm <br />0.01 m <br /> (1.7 cm17 mm <br />0.017 m <br />) +
hairy +  and glabrous +
less orbiculate +  and obovate or cuneate +
0.7 cm7 mm <br />0.007 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
fertile +  and bisexual +
fertile +  and bisexual +
Ark. +, Kans. +, La. +, Mo. +, Okla. +  and Tex. +
0–400 m +
hirsute +, hispid +  and scabrous +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Prairies, fencerows, roadsides +
in cymiform , corymbiform , paniculiform , racemiform or spiciform , arrays +  and singly +
indeterminate +
homogamous +  and heterogamous +
each +  and sessile +
1 cm10 mm <br />0.01 m <br /> (3 cm30 mm <br />0.03 m <br />) +
campanulate;hemispheric +
sessile +  and petiolate +
alternate +, subopposite +, opposite +  and whorled +
cauline +  and basal +
deltate +
entire +  and dentate +
toothed +  and entire +
reflexed +  and appressed +
2-carpellate +
persistent +
0.2 cm2 mm <br />0.002 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
Flowering summer. +
18 +  and 37 +
unequal +  and subequal +
Trans. Amer. Philos. Soc., n. s. +
bearing subulate enations +, hairy +  and bristly +
flat;slightly convex +
exalbuminous +
hirsute +, hispid +  and scabrous +
appendaged +  and truncate +
hirsutulous +  and glabrous +
papillate +
Silphium reverchonii +  and Silphium simpsonii var. wrightii +
Silphium radula var. radula +
Silphium radula +
variety +
cylindric +
cylindric +
shorter to longer than campanulate +
toothed +  and entire +
20 cm200 mm <br />0.2 m <br /> (250 cm2,500 mm <br />2.5 m <br />) +
fibrous-rooted +  and caulescent +
200 cm2,000 mm <br />2 m <br /> (400 cm4,000 mm <br />4 m <br />) +