Chloracantha spinosa var. spinosa

Illustrated
Treatment appears in FNA Volume 20. Treatment on page 358.

Stems 50–120 (–150) cm, usually thorny proximally but armament of distal portions variable among populations, some producing only thornless, wandlike branches. Leaves mostly 10–40 mm. Involucres 4–5.5 (–6) mm. Ray-floret laminae 3.5–5 (–7) mm. 2n = 18.


Phenology: Flowering (May–)Aug–Nov.
Habitat: Riverbanks, freshwater swamps, bottomlands, low prairies, saline flats, ditches, irrigation channels
Elevation: 0–1200(–1500) m

Distribution

V20-830-distribution-map.gif

Ariz., Calif., La., Nev., N.Mex., Okla., Tex., Utah, Mexico

Discussion

Selected References

None.

Lower Taxa

None.

not tailed +, rounded +  and obtuse +
distinct +
subequal +
scarious +
usually triangular +  and linear +
usually deltate +  and lanceolate +
corymbo-paniculiform +
indeterminate +  and determinate +
Scott D. Sundberg† +  and Guy L. Nesom +
(Bentham) G. L. Nesom +
decurrent +
Aster spinosus +
oblanceolate +
rugulose +  and muricate +
wand-like +
attenuate +
not 2-lipped +  and actinomorphic +
yellow +  and white +
beaked +, 2-ribbed +  and 5-ribbed +
compressed +  and fusiform-cylindric +
fertile +  and bisexual +
fertile +  and bisexual +
Ariz. +, Calif. +, La. +, Nev. +, N.Mex. +, Okla. +, Tex. +, Utah +  and Mexico +
0–1200(–1500) m +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Riverbanks, freshwater swamps, bottomlands, low prairies, saline flats, ditches, irrigation channels +
indeterminate +
heterogamous +  and homogamous +
each +  and sessile +
0.55 cm5.5 mm <br />0.0055 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
0.45 cm4.5 mm <br />0.0045 m <br /> (0.75 cm7.5 mm <br />0.0075 m <br />) +
broadly turbinate;hemispheric +
0.4 cm4 mm <br />0.004 m <br /> (0.55 cm5.5 mm <br />0.0055 m <br />) +
0.5 cm5 mm <br />0.005 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
1 cm10 mm <br />0.01 m <br /> (?) +  and 4 cm40 mm <br />0.04 m <br /> (?) +
erect;spreading +
deltate +
rarely +  and entire +
2-carpellate +
persistent +
Flowering (May–)Aug–Nov. +
parallel-nerved +
oblongelliptic +  and lanceolate +
0.5 cm5 mm <br />0.005 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
0.35 cm3.5 mm <br />0.0035 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
bearing subulate enations +, hairy +  and bristly +
exalbuminous +
Illustrated +
50 cm500 mm <br />0.5 m <br /> (120 cm1,200 mm <br />1.2 m <br />) +
acute +  and deltate +
appendaged +  and truncate +
papillate +  and smooth +
Leucosyris spinosa +
Chloracantha spinosa var. spinosa +
Chloracantha spinosa +
variety +
2 times longer than +
150 cm1,500 mm <br />1.5 m <br /> (250 cm2,500 mm <br />2.5 m <br />) +
glabrate +, glabrous +  and glaucous +
50 cm500 mm <br />0.5 m <br /> (150 cm1,500 mm <br />1.5 m <br />) +
glabrate +, glabrous +  and glaucous +