Pseudognaphalium viscosum

(Kunth) Anderberg

Opera Bot. 104: 148. 1991.

Common names: Sticky rabbit-tobacco
Basionym: 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), ovatelanceolate (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.
... more about "Pseudognaphalium viscosum"
white +  and gray +
white-tomentose +
grayish;greenish +
stipitate-glandular +
scarious +
mostly ovate +  and lanceovate or linear +
indeterminate +  and determinate +
Guy L. Nesom +
(Kunth) Anderberg +
decurrent +
0.3 cm3 mm <br />0.003 m <br /> (1 cm10 mm <br />0.01 m <br />) +
Gnaphalium viscosum +
compound +  and simple +
mostly narrowly lanceolate;oblanceolate +
5-ribbed +, 3-ribbed +  and 2-ribbed +
muriculate +, papillate +  and smooth +
Sticky rabbit-tobacco +
actinomorphic +
papillate-roughened +
not ridged +
Tex. +, Mexico +  and Central America +
1400–1800 m +
papillate-roughened +
winged +  and beaked +
dispersed +
Rocky open sites, roadsides +
singly +  and aggregated +
indeterminate +
homogamous +  and heterogamous +
each +  and sessile +
0.3 cm3 mm <br />0.003 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
campanulate +
0.5 cm5 mm <br />0.005 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
2 cm20 mm <br />0.02 m <br /> (4 cm40 mm <br />0.04 m <br />) +
4 cm40 mm <br />0.04 m <br /> (8 cm80 mm <br />0.08 m <br />) +
0.3 cm3 mm <br />0.003 m <br /> (1 cm10 mm <br />0.01 m <br />) +
cauline +  and basal +
rarely lanceovate +  and lanceolate +
strongly revolute +  and revolute-undulate +
2-carpellate +
persistent +
Flowering Jul–Sep. +
bearing subulate enations +, hairy +  and bristly +
conic;more or less columnar +
4 +  and 6 +
exalbuminous +
decumbent +  and procumbent +
appendaged +  and truncate +
papillate +
Compositae +
Pseudognaphalium viscosum +
Pseudognaphalium +
species +
150 cm1,500 mm <br />1.5 m <br /> (200 cm2,000 mm <br />2 m <br />) +
30 cm300 mm <br />0.3 m <br /> (100 cm1,000 mm <br />1 m <br />) +
shrub +  and subshrub +