Coreopsis sect. Silphidium

(Torrey & A. Gray) A. Gray in A. Gray et al.

in A. Gray et al., Syn. Fl. N. Amer. 1(2): 294. 1884.

Basionym: Silphidium Torrey & A. Gray Fl. N. Amer. 2: 341. 1842
Treatment appears in FNA Volume 21. Treatment on page 190. Mentioned on page 186.

Perennials. Leaves cauline, opposite; blades usually simple, sometimes with 1–2 auricles at base (margins dentate). Calyculi of 3–8+ bractlets. Phyllaries 5. Ray-florets 4–5, neuter; laminae ± elliptic to oblong, broadest at or near middle, apices entire or 2–3-toothed. Disc-florets 10–15+; corollas ochroleucous or pale-yellow, lobes 5; style-branch apices ± conic-attenuate. Paleae ± linear. Cypselae ± linear, margins thin, not winged, not ciliolate, faces smooth, glabrous; pappi 0 or (1–) 2 cusps (0.1–0.2+ mm). x = 13.

Distribution

se United States

Discussion

Species 1.

Selected References

None.

"broader" is not a number.

not tailed +, rounded +  and obtuse +
dark +  and pale +
connate +  and distinct +
subequal +
scarious +
usually ovate +  and lanceolate +
usually deltate +  and lanceolate +
paniculiform +, cymiform +  and corymbiform +
indeterminate +  and determinate +
John L. Strother +
(Torrey & A. Gray) A. Gray in A. Gray et al. +
smooth +  and ciliate or barbed +
1 +  and 2 +
decurrent +
Silphidium +
winged;ribbed;winged;ribbed +
tuberculate +  and rugose +
barbellulate +  and barbellate +
pale-yellow +  and ochroleucous +
winged +  and thin-margined +
less orbiculate +  and ovate oblong or linear +
fertile +  and bisexual +
fertile +  and bisexual +
se United States +
more or less papillate +  and tuberculate +
linear-fusiform;4-angled;ovate;orbiculate;oblong;linear;cuneate +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
discoid +  and radiate +
in open , more or less corymbiform arrays +  and singly +
indeterminate +
homogamous +  and heterogamous +
each +  and sessile +
0.4 cm4 mm <br />0.004 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
less globose;cylindric +
less elliptic +  and oblong +
broadest +
sessile +  and petiolate +
less deltate +  and lanceovate +
dentate to pinnatifid or palmatifid +  and entire +
not ciliolate +
2-carpellate +
ovate;linear or subulate +
persistent +
of 1-2 , smooth to ciliate or barbed awns or scales +  and coroniform +
in A. Gray et al., Syn. Fl. N. Amer. +
fertile +  and sterile +
bearing subulate enations +, hairy +  and bristly +
flat;convex +
exalbuminous +
appendaged +  and truncate +
hirsutulous +  and glabrous +
papillate +
Undefined (tribe Undefined) subtribe Coreopsideae +  and Undefined (tribe Undefined) subtribe Petrobiinae +
Coreopsis sect. Silphidium +
Coreopsis +
section +
toothed +  and entire +
shrub +  and subshrub +
corky +  and chartaceous +
lobed +  and toothed +
membranous +