Prenanthella exigua

(A. Gray) Rydberg

Bull. Torrey Bot. Club 33: 161. 1906.

Common names: Brightwhite desert prenanthella
Illustrated
Basionym: Prenanthes exigua A. Gray Smithsonian Contr. Knowl. 5(6): 105. 1853
Synonyms: Lygodesmia exigua (A. Gray) A. Gray
Treatment appears in FNA Volume 19. Treatment on page 360.

Leaves 1–3 cm, reduced distally to bracts 0.5–5 mm. Heads 10–150+. Calyculus bractlets 0.5–1+ mm. Principal phyllaries 3–5 mm after flowering. Corollas 1.5–2 mm. Cypselae 2.5–3.5 mm; pappi: longest bristles 2–3 mm. 2n = 14.


Phenology: Flowering Mar–Jun.
Habitat: Sandy, gravelly, or clay soils, desert washes and open slopes to sagebrush-juniper steppes
Elevation: 20–1900 m

Distribution

V19-571-distribution-map.gif

Ariz., Calif., Colo., Nev., Oreg., Tex., Utah, Mexico (Baja California), Mexico (Sonora)

Discussion

Selected References

None.

Lower Taxa

None.

"fine" is not a number.

... more about "Prenanthella exigua"
scarious +
ovate +  and lanceolate +
paniculiform +
indeterminate +  and determinate +
Kenton L. Chambers +
(A. Gray) Rydberg +
decurrent +
Prenanthes exigua +
compound +  and simple +
runcinate;spatulate;oblanceolate +
tuberculate +, rugose +, muricate +  and smooth +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
unequal +  and minute +
filiform +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
Brightwhite +  and desert prenanthella +
zygomorphic +, actinomorphic +  and (3-)5-merous +
white +  and pink +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
5-ribbed +  and not beaked +
tapering +  and columnar +
Ariz. +, Calif. +, Colo. +, Nev. +, Oreg. +, Tex. +, Utah +, Mexico (Baja California) +  and Mexico (Sonora) +
20–1900 m +
winged +  and beaked +
dispersed +
Sandy, gravelly, or clay soils, desert washes and open slopes to sagebrush-juniper steppes +
indeterminate +
each +  and sessile +
0.2 cm2 mm <br />0.002 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
cylindric;ovoid +
petiolate +  and sessile +
cauline +  and basal +
reduced +
1 cm10 mm <br />0.01 m <br /> (?) +  and 3 cm30 mm <br />0.03 m <br /> (?) +
0.2 cm2 mm <br />0.002 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
irregularly dentate +  and lobed +
2-carpellate +
not inflated +
Flowering Mar–Jun. +
connate +  and distinct +
subequal +  and unequal +
0.3 cm3 mm <br />0.003 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
Bull. Torrey Bot. Club +
flat;convex +
exalbuminous +
Illustrated +
glandular-puberulent +  and glabrescent +
1 +  and 5 +
appendaged +  and truncate +
papillate +
Lygodesmia exigua +
Prenanthella exigua +
Prenanthella +
species +
5 cm50 mm <br />0.05 m <br /> (30 cm300 mm <br />0.3 m <br />) +
shrub +  and subshrub +