Pseudognaphalium viscosum

(Kunth) Anderberg

Opera Bot. 104: 148. 1991

Common names: Sticky rabbit-tobacco
Basionyms: Gnaphalium viscosum Kunth in A. von Humboldt et al., Nov. Gen. Sp. 4(fol.): 64. 1818; 4(qto.): 82. 1820
Treatment appears in FNA Volume 19. Treatment on page 422. Mentioned on page 416, 423.

Annuals (viscid and unpleasantly aromatic), 30–100 cm; taprooted. Stems persistently white-tomentose and stipitate-glandular. Leaf blades (crowded, internodes mostly 1–3, sometimes to 10, mm) linear-lanceolate, (2–)4–8 cm × 3–10 mm, bases not clasping, usually (at least the proximal) decurrent 3–10 mm, margins strongly revolute to revolute-undulate, faces bicolor, abaxial densely white-tomentose, adaxial densely stipitate-glandular. Heads in corymbiform arrays. Involucres campanulate, 5–6 mm. Phyllaries in 5–6 series, tawny-silvery to silvery white (hyaline, shiny), ovate-lanceolate (not keeled or thickened along midribs, not apiculate), glabrous. Pistillate florets 200–250. Bisexual florets (13–)16–29. Cypselae not ridged, papillate-roughened. 2n = 28.


Phenology: Flowering Jul–Sep.
Habitat: Rocky open sites, roadsides
Elevation: 1400–1800 m

Distribution

V19-692-distribution-map.gif

Tex., Mexico, Central America.

Discussion

Reports of Pseudognaphalium viscosum from the flora for states other than Texas are based on plants of P. macounii. Pseudognaphalium viscosum is similar to P. leucocephalum, which has broader and white-opaque phyllaries, longer bisexual corollas, and smooth cypselae.

Selected References

None.

Lower Taxa

None.