Centratherum

Cassini

Bull. Sci. Soc. Philom. Paris 1817: 31. 1817.

,

in F. Cuvier, Dict. Sci. Nat. ed. 2, 7: 383. 1817.

Common names: Larkdaisy
Etymology: Latin centrum, center, and atherum, prickle or awn, perhaps alluding to spine-tipped middle phyllaries of original species
Treatment appears in FNA Volume 19. Treatment on page 206. Mentioned on page 67, 201.
 TaxonIllustrator 
FNA19 P15 Cyanthillium cinereum.jpegCyanthillium cinereum
Centratherum punctatum
Vernonia arkansana
Bee F. Gunn
Bee F. Gunn
Bee F. Gunn

Perennials (or functionally annuals), 1–3 (–8+) dm (stems sometimes rooting at proximal nodes). Leaves cauline; sessile or petiolate, petioles ± winged; blades ovate to obovate, lanceolate, or linear, bases ± cuneate, margins toothed, apices acute, abaxial faces usually ± hirtellous to strigillose or tomentose, sometimes nearly glabrous, adaxial faces sparsely scabrellous or glabrate, both usually resin-gland-dotted. Heads discoid (pedunculate, each subtended by 3–8+, ± foliaceous bracts), borne singly. Involucres ± hemispheric, 6–12 (–18+) mm diam. Phyllaries 24–50+ in 4–8+ series, each proximally firm, distally ± scarious, the outer ovate to deltate or lanceolate, inner oblong to lanceolate, margins entire, tips rounded to acute, usually apiculate to seta-tipped or attenuate-spinose, abaxial faces glabrous or sparsely strigillose to tomentose and usually ± resin-gland-dotted distally. Florets 30–50 (–100+); corollas usually lavender to purplish (rarely white), tubes longer than funnelform throats, lobes 5, lance-linear, ± equal. Cypselae ± columnar to plumply clavate, 8–10-ribbed, glabrous, often resin-gland-dotted; pappi caducous, of 20–40 lance-linear to subulate scales. x = 16.

Distribution

Fla., Neotropics, Pacific Islands (Philippines), Australia

Discussion

Species 2–4 (1 in the flora).

"dm" is not declared as a valid unit of measurement for this property."dm" is not declared as a valid unit of measurement for this property.

... more about "Centratherum"
resin-gland-dotted +, sparsely strigillose +  and tomentose +
resin-gland-dotted +  and glabrate +
scarious +
ovate +  and lanceolate +
indeterminate +  and determinate +
John L. Strother +
Cassini +
cuneate +
compound +  and simple +
ovate;obovate lanceolate or linear +
ribbed;nerved;ribbed;nerved;smooth +
lance-linear;more or less lanceolate +
Larkdaisy +
zygomorphic +, actinomorphic +  and (3-)5-merous +
usually lavender +  and purplish +
resin-gland-dotted +  and glabrous +
less columnar +  and plumply clavate +
fertile +  and bisexual +
Fla. +, Neotropics +, Pacific Islands (Philippines) +  and Australia +
Latin centrum, center, and atherum, prickle or awn, perhaps alluding to spine-tipped middle phyllaries of original species +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
indeterminate +
each +  and sessile +
0.6 cm6 mm <br />0.006 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
hemispheric +
petiolate +  and sessile +
ovate +  and deltate or lanceolate +
2-carpellate +
24 +  and 50 +
Bull. Sci. Soc. Philom. Paris +  and in F. Cuvier, Dict. Sci. Nat. ed. +
bearing subulate enations +, hairy +  and bristly +
flat;convex +
gleason1922a +  and kirkman1981a +
20 +  and 40 +
lance-linear +  and subulate +
exalbuminous +
prostrate +  and ascending +
appendaged +  and truncate +
hirsutulous +
Compositae +
Centratherum +
Asteraceae tribe Vernonieae +
usually apiculate +  and seta-tipped or attenuate-spinose +
rounded +  and acute +