Conyza floribunda

Kunth in A. von Humboldt et al.

in A. von Humboldt et al., Nov. Gen. Sp. 4(fol.): 57. 1818.

,

4(qto.): 73. 1820.

Introduced
Synonyms: Conyza bilbaoana Remy Conyza bonariensis var. leiotheca (S. F. Blake) Cuatrecasas
Treatment appears in FNA Volume 20. Treatment on page 350. Mentioned on page 349.

Plants erect, 30–150+ cm, branched mostly distally. Leaves: faces sparsely strigose to hispidulous or glabrate (margins ± ciliolate proximally, hairs erect, on nerves); proximal narrowly oblanceolate to linear, 50–100 × 5–15 mm, toothed or entire; distal similar, smaller, entire. Heads in paniculiform or corymbiform arrays. Involucres 3–4 mm. Phyllaries usually sparsely strigose (at least the outer; margins chartaceous to scarious), outer greenish, becoming reddish-brown, lanceolate, shorter, inner stramineous to reddish, lance-attenuate. Receptacles 1–2+ mm diam. in fruit. Pistillate florets 30–40+; corollas ± equaling or surpassing styles, laminae 0 or to 0.3 mm. Disc-florets 10–20+. Cypselae pale tan (usually some with reddish nerves), 1–1.5 mm, faces sparsely strigillose or glabrate; pappi of 15–25 white bristles 2–3 mm. 2n = 18; 54 or 56.


Phenology: Flowering summer–fall.
Habitat: Disturbed sites
Elevation: 10–100 m

Distribution

V20-805-distribution-map.gif

Introduced; Calif., Fla., Mexico, Central America, South America, Europe, Asia, Africa

Discussion

Conyza floribunda is thought to be native to South America.

In some floras of the past 50 or so years, Conyza bilbaoana has been treated as distinct from C. floribunda; in others, C. bilbaoana and C. floribunda have been treated as synonyms of C. bonariensis. For some traits (e.g., indument, phyllaries, florets), members of C. floribunda are intermediate to C. bonariensis and C. canadensis; some specimens that I have called C. floribunda may be hybrids. For example, a robust specimen from Santa Cruz Island, California, was originally labeled “C. bonariensis ×canadensis (?).” Locally (e.g., in Berkeley, California), C. canadensis usually comes into flower as C. bonariensis goes to seed. So far as sampled, C. canadensis is diploid; C. bonariensis is hexaploid. Pollen stainability in the Santa Cruz Island specimen is ca. 99%.

If treated as a variety of Conyza bonariensis, the correct name for the taxon treated here as C. floribunda is C. bonariensis var. leiotheca.

Some botanists, e.g., J. B. Marshall (1974), have treated the nomenclatural types of Conyza floribunda and C. sumatrensis (Retzius) E. Walker (= Erigeron sumatrensis Retzius) as conspecific.

Lower Taxa

None.
... more about "Conyza floribunda"
strigose +, hispidulous +, hirsutulous +  and glabrous +
not tailed +, rounded +  and obtuse +
distinct +
subequal +
scarious +
usually triangular +  and linear +
usually deltate +  and lanceolate +
corymbiform +  and paniculiform +
indeterminate +  and determinate +
John L. Strother +
Kunth in A. von Humboldt et al. +
decurrent +
compound +  and simple +
mostly lanceolate;oblanceolate or linear +
rugulose +  and muricate +
barbellulate +  and barbellate +
0.2 cm2 mm <br />0.002 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
not 2-lipped +  and actinomorphic +
yellowish +, ochroleucous +, white +  and purplish +
20 +  and 150 +
surpassing styles +  and equaling +
beaked +, 2-ribbed +  and 5-ribbed +
oblong +  and elliptic +
fertile +  and bisexual +
fertile +  and bisexual +
Calif. +, Fla. +, Mexico +, Central America +, South America +, Europe +, Asia +  and Africa +
10–100 m +
glabrate +, strigillose +, sparsely strigose +  and hispidulous or glabrate +
winged +  and beaked +
dispersed +
Disturbed sites +
corymbiform +, paniculiform +, disciform +  and radiate +
indeterminate +
heterogamous +  and homogamous +
each +  and sessile +
stramineous +  and reddish +
lance-attenuate +
0.2 cm2 mm <br />0.002 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
0.3 cm3 mm <br />0.003 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
sessile +  and petiolate +
cauline +  and basal +
spreading;erect +
deltate +
dentate to pinnatifid +  and entire +
entire +, toothed +  and lobed +
membranous +
reddish-brown +  and greenish +
2-carpellate +
white +, tawny +  and sordid +
persistent +
56 +  and 54 +
Flowering summer–fall. +
lanceolate +  and linear +
unequal +  and larger +
5 cm50 mm <br />0.05 m <br /> (10 cm100 mm <br />0.1 m <br />) +
0.5 cm5 mm <br />0.005 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
in A. von Humboldt et al., Nov. Gen. Sp. +
1818 +  and 1820 +
styliferous +, neuter +  and pistillate +
bearing subulate enations +, hairy +  and bristly +
concave;usually flat;conic +
marshall1974a +
exalbuminous +
Introduced +
strigose +, strigillose +, hispidulous +, hispid +  and glabrous +
appendaged +  and truncate +
papillate +  and smooth +
Conyza bilbaoana +  and Conyza bonariensis var. leiotheca +
Conyza floribunda +
species +
120 cm1,200 mm <br />1.2 m <br /> (350 cm3,500 mm <br />3.5 m <br />) +
10 cm100 mm <br />0.1 m <br /> (120 cm1,200 mm <br />1.2 m <br />) +