Oxytenia

Nuttall

Proc. Acad. Nat. Sci. Philadelphia 4: 20. 1848.

Common names: Copper-weed
Etymology: Greek oxytenes, acuminate, “in allusion to the rigid narrow foliage”
Treatment appears in FNA Volume 21. Treatment on page 29. Mentioned on page 9, 25.
 TaxonIllustrator 
FNA21 P05 Oxytenia acerosa.jpegOxytenia acerosa
Leuciva dealbata
Hedosyne ambrosiifolia
Linda Ann Vorobik
Barbara Alongi
Yevonn Wilson-Ramsey

Subshrubs or shrubs, 50–200 cm. Stems erect, virgately branched. Leaves cauline; alternate; petiolate or ± sessile; blades mostly pinnately lobed (lobes 3–7+, linear to filiform), distal (not lobed) linear to filiform, faces usually sericeous to strigillose, sometimes glabrate or glabrous, usually glanddotted. Heads disciform, in (ebracteate or nearly so) paniculiform arrays, or borne singly or in glomerules of 1–5+. Involucres ± hemispheric, 4–5+ mm diam. Phyllaries persistent, 10–15+ in 2–3 series, distinct, outer 5–7 herbaceous, inner scarious to membranous (± villous). Receptacles convex; paleae spatulate to cuneiform, membranous, distally ± villous. Pistillate florets 5; corollas 0. Functionally staminate florets 10–25+; corollas whitish, funnelform, lobes 5, erect (filaments connate, anthers distinct or weakly coherent). Cypselae plumply obovoid, obcompressed or weakly 3–4-angled, smooth, ± villous, little, if at all, glanddotted; pappi 0. x = 18.

Distribution

w United States

Discussion

Species 1.

Selected References

None.

Lower Taxa

... more about "Oxytenia"
not tailed +, rounded +  and obtuse +
connate +  and distinct +
subequal +
scarious +
usually ovate +  and lanceolate +
usually deltate +  and lanceolate +
paniculiform +
indeterminate +  and determinate +
John L. Strother +
Nuttall +
decurrent +
compound +  and simple +
winged;ribbed;winged;ribbed +
tuberculate +  and rugose +
barbellulate +  and barbellate +
Copper-weed +
scabrellous +  and tuberculate +
3-4-angled +, obcompressed +  and obovoid +
fertile +  and bisexual +
w United States +
Greek oxytenes, acuminate, “in allusion to the rigid narrow foliage” +
glabrous +, glabrate +, usually sericeous +  and strigillose +
staminate +  and pistillate +
winged +  and beaked +
dispersed +
in corymbiform , glomerate , paniculiform , racemiform or spiciform , arrays +  and singly +
indeterminate +
homogamous +  and heterogamous +
each +  and sessile +
scarious +  and membranous +
0.4 cm4 mm <br />0.004 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
hemispheric +
conspicuous +
sessile +  and petiolate +
deltate +
dentate to pinnatifid or palmatifid +  and entire +
2-carpellate +
spatulate;cuneiform +
membranous +
persistent +
10 +  and 15 +
unequal +  and subequal +
Proc. Acad. Nat. Sci. Philadelphia +
bearing subulate enations +, hairy +  and bristly +
exalbuminous +
appendaged +  and truncate +
hirsutulous +  and glabrous +
papillate +
Undefined (tribe Undefined) subtribe Ambrosieae +  and Undefined (tribe Undefined) subtribe Iveae +
Oxytenia +
Asteraceae (tribe Heliantheae) subtribe Ambrosiinae +
campanulate +  and cylindric +
toothed +  and entire +
perennial +, biennial +  and annual +
shrub +  and subshrub +