Pseudognaphalium roseum

(Kunth) Anderberg

Opera Bot. 104: 148. 1991.

Common names: Rosy rabbit-tobacco
Introduced
Basionym: Gnaphalium roseum Kunth in A. von Humboldt et al., Nov. Gen. Sp. 4(fol.): 63. 1818; 4(qto.): 81. 1820
Treatment appears in FNA Volume 19. Treatment on page 424. Mentioned on page 417.

Annuals or perennials, 50–200 cm; taprooted. Stems persistently woolly-tomentose, not glandular. Leaf-blades oblong-lanceolate to oblanceolate, midcauline 3–7 cm × (3–) 6–15 (–20) mm, bases clasping to subclasping, not decurrent, margins usually undulate, faces concolor or weakly bicolor, usually woolly-tomentose, sometimes tardily glabrescent adaxially, stipitate or sessile-glandular beneath tomentum. Heads in corymbiform arrays. Involucres campanulate, 4–4.5 mm. Phyllaries in 5–6 series, usually white, sometimes pink (opaque or hyaline, dull to shiny), ovate to ovate-oblong, glabrous. Pistillate florets 45–90 (–110). Bisexual florets (5–) 6–12 (–18). Cypselae weakly ridged, smooth.


Phenology: Flowering Mar–Jun.
Habitat: Open, disturbed sites
Elevation: 10–50 [–1000+] m

Distribution

V19-697-distribution-map.gif

Introduced; Calif., Mexico, Central America

Discussion

Pseudognaphalium roseum usually grows above 1000 m in Mexico; it grows below 50 m in California, where it is probably adventive. The closest collections of the species southward from California are from Sinaloa and southern Chihuahua. It is abundant in Mexico only in the eastern and southern states.

Pseudognaphalium roseum is recognized by its persistently tomentose stems and leaves, the leaves clasping to subclasping and non-decurrent, weakly bicolor and sessile-glandular beneath the tomentum, often relatively thick stems, relatively large heads with relatively numerous, white or pink, opaque phyllaries, relatively numerous florets, and smooth-faced cypselae. It has been confused with P. canescens; plants of P. roseum with relatively few bisexual florets can be distinguished from P. canescens by their subclasping leaves commonly with closely wavy margins, broader and more numerous phyllaries, and smooth-faced cypselae. Plants from southern California are atypical in their slightly smaller heads.

Selected References

None.

Lower Taxa

None.
... more about "Pseudognaphalium roseum"
white +  and gray +
tomentose +  and velutinous +
grayish;greenish +
arachnose +, glabrescent +  and glabrous +
scarious +
mostly ovate +  and lanceovate or linear +
indeterminate +  and determinate +
Guy L. Nesom +
(Kunth) Anderberg +
clasping +  and subclasping +
not decurrent +
Gnaphalium roseum +
compound +  and simple +
mostly narrowly lanceolate;oblanceolate +
5-ribbed +, 3-ribbed +  and 2-ribbed +
muriculate +, papillate +  and smooth +
Rosy rabbit-tobacco +
actinomorphic +
Calif. +, Mexico +  and Central America +
10–50 [–1000+] m +
sessile-glandular +  and stipitate +
bicolor;concolor +
glabrescent +  and woolly-tomentose +
papillate-roughened +
winged +  and beaked +
dispersed +
Open, disturbed sites +
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 +
0.4 cm4 mm <br />0.004 m <br /> (0.45 cm4.5 mm <br />0.0045 m <br />) +
cauline +  and basal +
rarely lanceovate +  and lanceolate +
undulate +
1.5 cm15 mm <br />0.015 m <br /> (2 cm20 mm <br />0.02 m <br />) +
3 cm30 mm <br />0.03 m <br /> (7 cm70 mm <br />0.07 m <br />) +
0.6 cm6 mm <br />0.006 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
2-carpellate +
persistent +
Flowering Mar–Jun. +
bearing subulate enations +, hairy +  and bristly +
conic;more or less columnar +
4 +  and 6 +
exalbuminous +
Introduced +
decumbent +  and procumbent +
appendaged +  and truncate +
papillate +
Compositae +
Pseudognaphalium roseum +
Pseudognaphalium +
species +
150 cm1,500 mm <br />1.5 m <br /> (200 cm2,000 mm <br />2 m <br />) +
perennial +  and annual +
50 cm500 mm <br />0.5 m <br /> (200 cm2,000 mm <br />2 m <br />) +
shrub +  and subshrub +