Cyclachaena

Fresenius

Index Seminum (Frankfurt) 1836: 4. 1838.

Etymology: Greek cyclo -, circular, and Latin achenium, achene allusion uncertain, perhaps to the ring of cypselae in each fruiting head
Treatment appears in FNA Volume 21. Treatment on page 28. Mentioned on page 9, 25.
 TaxonIllustrator 
FNA21 P04 Iva frutescens.jpegIva frutescens
Iva axillaris
Cyclachaena xanthiifolia
Yevonn Wilson-Ramsey
Yevonn Wilson-Ramsey
Marjorie C. Leggitt

Annuals, 30–120 (–200) cm. Stems erect, strictly, if at all, branched. Leaves cauline; mostly opposite (distal sometimes alternate); petiolate; blades (3–5-nerved) ± deltate, ovate, or rhombic (proximal 1–3 pairs, often 3–5-lobed), margins usually toothed, faces densely to sparsely scabrellous to strigillose (abaxial often canescent), both usually glanddotted. Heads ± disciform, in (± ebracteate) paniculiform arrays. Involucres turbinate to hemispheric, 3–5+ mm diam. Phyllaries persistent, 10–12+ in 2+ series, distinct, outer 5 herbaceous, inner scarious to membranous. Receptacles convex to conic; paleae spatulate to linear, ± membranous, sometimes 0. Pistillate florets 5; corollas whitish, tubular, or 0. Functionally staminate florets 5–10 (–20+); corollas whitish, funnelform, lobes 5, erect (filaments connate, anthers distinct). Cypselae plumply obovoid to obcompressed, finely striate, sparsely strigillose or hispidulous distally, little, if at all, glanddotted; pappi 0. x = 18.

Distribution

North America, in Europe

Discussion

Species 1.

Selected References

None.

... more about "Cyclachaena"
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 +
Fresenius +
decurrent +
compound +  and simple +
rhombic;ovate;rhombic;ovate;deltate +
winged;ribbed;winged;ribbed +
tuberculate +  and rugose +
barbellulate +  and barbellate +
hispidulous +, strigillose +  and striate +
scabrellous +  and tuberculate +
plumply obovoid +  and obcompressed +
fertile +  and bisexual +
North America +  and in Europe +
Greek cyclo -, circular, and Latin achenium, achene +  and allusion uncertain, perhaps to the ring of cypselae in each fruiting head +
strigillose +
scabrellous +
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 +
0.3 cm3 mm <br />0.003 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
turbinate;hemispheric +
conspicuous +
deltate +
dentate to pinnatifid or palmatifid +  and entire +
2-carpellate +
spatulate;linear +
membranous +
persistent +
10 +  and 12 +
unequal +  and subequal +
Index Seminum (Frankfurt) +
bearing subulate enations +, hairy +  and bristly +
convex;conic +
exalbuminous +
appendaged +  and truncate +
hirsutulous +  and glabrous +
papillate +
Undefined (tribe Undefined) subtribe Ambrosieae +  and Undefined (tribe Undefined) subtribe Iveae +
Cyclachaena +
Asteraceae (tribe Heliantheae) subtribe Ambrosiinae +
campanulate +  and cylindric +
toothed +  and entire +
120 cm1,200 mm <br />1.2 m <br /> (200 cm2,000 mm <br />2 m <br />) +
30 cm300 mm <br />0.3 m <br /> (120 cm1,200 mm <br />1.2 m <br />) +
shrub +  and subshrub +