Pseudognaphalium arizonicum

(A. Gray) Anderberg

Opera Bot. 104: 147. 1991.

Common names: Arizona rabbit-tobacco
Basionym: Gnaphalium arizonicum A. Gray Proc. Amer. Acad. Arts 19: 3. 1883
Treatment appears in FNA Volume 19. Treatment on page 424. Mentioned on page 417.

Annuals or perennials, 20–50 cm; taprooted. Stems loosely and densely woolly-tomentose (hairs usually with reddish or purplish cross-walls), not glandular. Leaf-blades linear-oblanceolate to linear-lanceolate, 2–6 cm × 2–7 mm, bases not clasping, decurrent 3–15 (–20) mm, margins weakly and narrowly revolute, faces concolor to weakly bicolor, tomentose (hairs commonly with reddish or purplish cross-walls), not glandular. Heads borne singly or in terminal glomerules or corymbiform arrays. Involucres turbinate-campanulate, 5–6 mm. Phyllaries in 4–5 series, usually brownish to tawny, rarely slightly rosy (opaque, shiny), ovatelanceolate to lanceolate, glabrous. Pistillate florets (25–) 30–49. Bisexual florets (1–) 3–6. Cypselae ridged, papillate-roughened.


Phenology: Flowering Aug–Sep.
Habitat: Open woodlands and chaparral [wide ranging habitats in Mexico, agricultural land to oak and pine woodlands]
Elevation: 1600–2300 m

Discussion

Pseudognaphalium arizonicum is superficially similar to P. stramineum in its narrow, concolor leaves; P. stramineum has non-decurrent leaves, light yellowish phyllaries, and more pistillate and bisexual florets.

Selected References

None.

Lower Taxa

None.
white +  and gray +
tomentose +  and velutinous +
grayish;greenish +
arachnose +, glabrescent +  and glabrous +
scarious +
mostly ovate +  and lanceovate or linear +
paniculiform +  and corymbiform +
indeterminate +  and determinate +
Guy L. Nesom +
(A. Gray) Anderberg +
decurrent +
0.3 cm3 mm <br />0.003 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
Gnaphalium arizonicum +
compound +  and simple +
mostly narrowly lanceolate;oblanceolate +
5-ribbed +, 3-ribbed +  and 2-ribbed +
muriculate +, papillate +  and smooth +
Arizona rabbit-tobacco +
actinomorphic +
papillate-roughened +
Ariz. +, Tex. +  and w Mexico +
1600–2300 m +
concolor;weakly bicolor +
papillate-roughened +
winged +  and beaked +
dispersed +
Open woodlands and chaparral [wide ranging habitats in Mexico, agricultural land to oak and pine woodlands] +
corymbiform +
in terminal glomerules +  and singly +
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 />) +
turbinate-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 /> (6 cm60 mm <br />0.06 m <br />) +
0.2 cm2 mm <br />0.002 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
cauline +  and basal +
rarely lanceovate +  and lanceolate +
2-carpellate +
persistent +
Flowering Aug–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 arizonicum +
Pseudognaphalium +
species +
150 cm1,500 mm <br />1.5 m <br /> (200 cm2,000 mm <br />2 m <br />) +
perennial +  and annual +
20 cm200 mm <br />0.2 m <br /> (50 cm500 mm <br />0.5 m <br />) +
shrub +  and subshrub +