Silphium integrifolium var. laeve

Torrey & A. Gray

Fl. N. Amer. 2: 279. 1842.

Endemic
Basionym: Silphium speciosum Nuttall Trans. Amer. Philos. Soc., n.s. 7: 341. 1840
Treatment appears in FNA Volume 21. Treatment on page 80.

Plants 100–150 cm. Leaves: blades glabrous. Phyllaries: abaxial faces glabrous. Ray-florets 20–36+. Disc-florets 130–225.2n = 14.


Phenology: Flowering mid summer–early fall.
Habitat: Prairies, along roads and railroads
Elevation: 100–600 m

Distribution

V21-181-distribution-map.gif

Ont., Ark., Iowa, Kans., Mo., Nebr., N.Mex., Okla., Tex., Wyo.

Discussion

Selected References

None.

Lower Taxa

None.

"broader" is not a number.

not tailed +, rounded +  and obtuse +
connate +  and distinct +
acute;acuminate +
subequal +
scarious +
usually ovate +  and lanceolate +
usually deltate +  and lanceolate +
racemiform +  and paniculiform +
indeterminate +  and determinate +
Jennifer A. Clevinger +
Torrey & A. Gray +
bristlelike +
coroniform +
round +  and caudate +
Silphium speciosum +
compound +  and simple +
2 cm20 mm <br />0.02 m <br /> (23 cm230 mm <br />0.23 m <br />) +
lanceolate;ovate +
0.1 cm1 mm <br />0.001 m <br /> (11 cm110 mm <br />0.11 m <br />) +
winged;ribbed;winged;ribbed +
tuberculate +  and rugose +
barbellulate +  and barbellate +
0.9 cm9 mm <br />0.009 m <br /> (1.4 cm14 mm <br />0.014 m <br />) +
hairy +  and glabrous +
less orbiculate +  and obovate or cuneate +
0.6 cm6 mm <br />0.006 m <br /> (1 cm10 mm <br />0.01 m <br />) +
fertile +  and bisexual +
fertile +  and bisexual +
Ont. +, Ark. +, Iowa +, Kans. +, Mo. +, Nebr. +, N.Mex. +, Okla. +, Tex. +  and Wyo. +
100–600 m +
glabrous +, scabrous +  and hispid +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Prairies, along roads and railroads +
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 serrate +
toothed +  and entire +
2-carpellate +
persistent +
0.1 cm1 mm <br />0.001 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
Flowering mid summer–early fall. +
17 +  and 37 +
unequal +  and subequal +
Fl. N. Amer. +
bearing subulate enations +, hairy +  and bristly +
flat;slightly convex +
exalbuminous +
glabrous +  and scabrous +
terete +  and slightly square +
appendaged +  and truncate +
hirsutulous +  and glabrous +
papillate +
Undefined (tribe Undefined) subtribe Enceliinae +, Undefined (tribe Undefined) subtribe Engelmanniinae +, Undefined (tribe Undefined) subtribe Spilanthinae +, Undefined (tribe Undefined) subtribe Verbesininae +  and Undefined (tribe Undefined) subtribe Zinniinae +
Silphium integrifolium var. laeve +
Silphium integrifolium +
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 />) +