Pseudognaphalium canescens

(de Candolle) Anderberg

Opera Bot. 104: 147. 1991.

Common names: Wright’s rabbit-tobacco
Basionym: Gnaphalium canescens de Candolle in A. P. de Candolle and A. L. P. P. de Candolle, Prodr. 6: 228. 1838
Synonyms: Gnaphalium sonorae I. M. Johnston Gnaphalium texanum I.M Johnston Gnaphalium viridulum I. M. Johnston Gnaphalium wrightii A. Gray
Treatment appears in FNA Volume 19. Treatment on page 418. Mentioned on page 417, 424.

Annuals or perennials, 20–70 (–100+) cm; taprooted. Stems persistently tomentose, not glandular (2–3 mm diam. near bases). Leaf-blades narrowly to broadly oblanceolate, mostly 2–4 (–5) cm × 2–8 (–15) mm, bases not clasping, not decurrent, margins flat, faces weakly bicolor, tomentose (adaxial less densely tomentose, sometimes sessile-glandular beneath tomentum). Heads usually in loose, corymbiform arrays. Involucres turbinate-campanulate, 4–5 mm. Phyllaries in 3–4 series, white (opaque to hyaline, dull to shiny), narrowly ovatelanceolate, glabrous. Pistillate florets (16–) 24–44. Bisexual florets (1–) 2–5 (–6), 5–6 more common in northern part of range. Cypselae ridged, weakly papillate-roughened. 2n = 28.


Phenology: Flowering Aug–Nov(–Jan).
Habitat: Lava beds, rocky sites, grasslands, oak, pine-oak, and pine woodlands
Elevation: 1100–2500(–2700) m

Distribution

V19-682-distribution-map.gif

Ariz., Calif., Colo., N.Mex., Okla., Tex., Utah, Mexico

Discussion

Most plants of Pseudognaphalium canescens produce white, opaque, keeled, apiculate phyllaries; in the southern portion of its range (Jalisco southeastward) and scattered localities elsewhere, the phyllaries may be more hyaline and lack a pronounced keel and apiculum.

Selected References

None.

Lower Taxa

None.
white +  and gray +
tomentose +  and velutinous +
grayish;greenish +
arachnose +, glabrescent +  and glabrous +
truncate-penicillate;truncate +
scarious +
mostly ovate +  and lanceovate or linear +
indeterminate +  and determinate +
Guy L. Nesom +
(de Candolle) Anderberg +
not decurrent +
Gnaphalium canescens +
compound +  and simple +
mostly narrowly lanceolate;oblanceolate +
5-ribbed +, 3-ribbed +  and 2-ribbed +
muriculate +, papillate +  and smooth +
Wright’s rabbit-tobacco +
actinomorphic +
papillate-roughened +
Ariz. +, Calif. +, Colo. +, N.Mex. +, Okla. +, Tex. +, Utah +  and Mexico +
1100–2500(–2700) m +
papillate-roughened +
common;5;6 +
winged +  and beaked +
dispersed +
Lava beds, rocky sites, grasslands, oak, pine-oak, and pine woodlands +
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 />) +
turbinate-campanulate +
0.4 cm4 mm <br />0.004 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
4 cm40 mm <br />0.04 m <br /> (5 cm50 mm <br />0.05 m <br />) +
0.8 cm8 mm <br />0.008 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
2 cm20 mm <br />0.02 m <br /> (4 cm40 mm <br />0.04 m <br />) +
oblanceolate +
cauline +  and basal +
rarely lanceovate +  and lanceolate +
2-carpellate +
persistent +
Flowering Aug–Nov(–Jan). +
bearing subulate enations +, hairy +  and bristly +
conic;more or less columnar +
4 +  and 6 +
exalbuminous +
decumbent +  and procumbent +
appendaged +  and truncate +
papillate +
Gnaphalium sonorae +, Gnaphalium texanum +, Gnaphalium viridulum +  and Gnaphalium wrightii +
Pseudognaphalium canescens +
Pseudognaphalium +
species +
70 cm700 mm <br />0.7 m <br /> (100 cm1,000 mm <br />1 m <br />) +
perennial +  and annual +
20 cm200 mm <br />0.2 m <br /> (70 cm700 mm <br />0.7 m <br />) +
shrub +  and subshrub +