Xanthisma viscidum

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

Sida 20: 1410. 2003.

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.
Revision as of 20:31, 16 December 2019 by FNA>Volume Importer

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"
Ronald L. Hartman +
(Wooton & Standley) D. R. Morgan & R. L. Hartman +
Sideranthus viscidus +
N.Mex. +  and Tex. +
1000–1700 m +
Sandy soils on flats, roadsides +
Flowering summer–fall. +
Haplopappus havardii +, Haplopappus viscidus +, Machaeranthera havardii +  and Machaeranthera viscida +
Xanthisma viscidum +
Xanthisma sect. Havardii +
species +