Xanthisma viscidum

(Wooton & Standley) D. R. Morgan & R. L. Hartman

Sida 20: 1410. 2003.

Endemic
Basionym: Sideranthus viscidus Wooton & Standley Contr. U.S. Natl. Herb. 16: 180. 1913
Synonyms: Haplopappus havardii Waterfall Haplopappus viscidus (Wooton & Standley) S. F. Blake Machaeranthera havardii (Waterfall) Shinners Machaeranthera viscida (Wooton & Standley) R. L. Hartman
Treatment appears in FNA Volume 20. Treatment on page 393. Mentioned on page 384.

Annuals, 25–60 cm; taproots 2–8+ cm. Stems 1, branched, moderately stout to stout, not wiry, stipitate-glandular. Leaves: basal usually withering by flowering; cauline evenly spaced, obovate to oblanceolate or oblong, 5–30 × 2–15 mm, markedly reduced distally, margins coarsely serrate to dentate, teeth 4–7 per side, entire, faces densely stipitate-glandular. Peduncles densely stipitate-glandular, usually ebracteate. Involucres hemispheric, 8–10 × 13–18 mm. Phyllaries in 5–7 series, linear, 2–7 mm, apices narrowly obtuse to acuminate, faces stipitate-glandular. Ray-florets 14–18; corollas yellow, tubes 3–3.5 mm, laminae 2.8–3.5 × 1.5–2 mm. Disc-florets 20–30+; corollas 5.5–6 mm. Cypselae oblong to narrowly ellipsoid, 2.3–2.7 mm, 18–22-nerved, sparsely whitish-silky; pappi tawny, 5–6 mm, mostly equal. 2n = 8.


Phenology: Flowering summer–fall.
Habitat: Sandy soils on flats, roadsides
Elevation: 1000–1700 m

Discussion

Selected References

None.

Lower Taxa

None.
... more about "Xanthisma viscidum"
not tailed +, rounded +  and obtuse +
not bristle-tipped +
distinct +
stipitate-glandular +
narrowly obtuse;acuminate +
subequal +
scarious +
usually triangular +  and linear +
usually deltate +  and lanceolate +
indeterminate +  and determinate +
Ronald L. Hartman +
(Wooton & Standley) D. R. Morgan & R. L. Hartman +
decurrent +
indurate +
Sideranthus viscidus +
lanceolate;oblanceolate or spatulate +
rugulose +  and muricate +
barbellulate +  and barbellate +
0.5 cm5 mm <br />0.005 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
0.5 cm5 mm <br />0.005 m <br /> (3 cm30 mm <br />0.03 m <br />) +
obovate +  and oblanceolate or oblong +
0.2 cm2 mm <br />0.002 m <br /> (?) +  and 1.5 cm15 mm <br />0.015 m <br /> (?) +
not 2-lipped +  and actinomorphic +
0.55 cm5.5 mm <br />0.0055 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
whitish-silky +
oblong +  and narrowly ellipsoid +
fertile +  and bisexual +
fertile +  and bisexual +
N.Mex. +  and Tex. +
1000–1700 m +
stipitate-glandular +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Sandy soils on flats, roadsides +
discoid +  and radiate +
in corymbiform arrays +  and singly +
indeterminate +
heterogamous +  and homogamous +
each +  and sessile +
0.8 cm8 mm <br />0.008 m <br /> (1 cm10 mm <br />0.01 m <br />) +
hemispheric +
1.3 cm13 mm <br />0.013 m <br /> (1.8 cm18 mm <br />0.018 m <br />) +
2.8mm;3.5mm +
ovate +  and orbiculate or depressed-elliptic +
unequal +
1.5mm;2mm +
dentate +  and serrate +
sessile +  and short-petiolate +
cauline +  and basal +
triangular +
coarsely serrate +  and dentate +
2-pinnatifid +, pinnatifid +  and dentate +
2-carpellate +
persistent +
30 +  and 90 +
flattened +
0.5 cm5 mm <br />0.005 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
stipitate-glandular +
Flowering summer–fall. +
reflexed +, spreading +  and appressed +
linear +  and narrowly oblong +
0.2 cm2 mm <br />0.002 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
0.1 cm1 mm <br />0.001 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
bearing subulate enations +, hairy +  and bristly +
flat;convex +
exalbuminous +
distinct +
0.01 cm0.1 mm <br />1.0e-4 m <br /> (0.05 cm0.5 mm <br />5.0e-4 m <br />) +
not wiry +  and branched +
moderately stout +  and stout +
sprawling +, spreading +  and erect +
stipitate-glandular +
green patch +
expanded +
appendaged +  and truncate +
papillate +  and smooth +
Haplopappus havardii +, Haplopappus viscidus +, Machaeranthera havardii +  and Machaeranthera viscida +
Xanthisma viscidum +
Xanthisma sect. Havardii +
species +
not bristle-tipped +
distinct +
terminating in stiff callosities +  and blunt +
0.01 cm0.1 mm <br />1.0e-4 m <br /> (0.05 cm0.5 mm <br />5.0e-4 m <br />) +
0.3 cm3 mm <br />0.003 m <br /> (0.35 cm3.5 mm <br />0.0035 m <br />) +
discernible +
25 cm250 mm <br />0.25 m <br /> (60 cm600 mm <br />0.6 m <br />) +