Pseudognaphalium stramineum

(Kunth) Anderberg

Opera Bot. 104: 148. 1991.

Common names: Cotton-batting-plant
Illustrated
Basionym: Gnaphalium stramineum Kunth in A. von Humboldt et al., Nov. Gen. Sp. 4(fol.): 66. 1818; 4(qto.): 85. 1820
Synonyms: Gnaphalium chilense Sprengel Gnaphalium chilense var. confertifolium Greene Gnaphalium gossypinum Rydberg Gnaphalium lagopodioides Greene Gnaphalium proximum Rydberg Gnaphalium sulphurescens
Treatment appears in FNA Volume 19. Treatment on page 418. Mentioned on page 415, 416, 424.

Annuals or biennials, 30–60 (–80) cm; taprooted. Stems (1+ from base, erect to ascending) loosely tomentose, not glandular. Leaf-blades (crowded, internodes usually 1–5, sometimes to 10 mm) oblong to narrowly oblanceolate or subspatulate, 2–8 (–9.5) cm × 2–5 (–10) mm (smaller distally, narrowly lanceolate to linear), bases subclasping, usually not decurrent, sometimes decurrent 1–2 mm, margins flat or slightly revolute, faces concolor, loosely and persistently gray-tomentose, not glandular. Heads in terminal glomerules (1–2 cm diam.). Involucres subglobose, 4–6 mm. Phyllaries in 4–5 series, whitish (often yellowish with age, hyaline, shiny), ovate to oblong-obovate, glabrous. Pistillate florets 160–200. Bisexual florets [8–] 18–28. Cypselae weakly, if at all, ridged (otherwise smooth or papillate-roughened, glabrous, without papilliform hairs; pappus bristles loosely coherent basally, released in clusters or easily fragmented rings). 2n = 28.


Phenology: Flowering Mar–Oct.
Habitat: Sandy fields, streamsides, washes, swales, dunes, chaparral slopes, roadsides, fields, disturbed places, moist disturbed places
Elevation: 10–1600 m

Distribution

V19-681-distribution-map.gif

B.C., Ariz., Calif., Colo., Idaho, Mont., Nebr., Nev., N.Mex., N.Y., N.C., Okla., Oreg., S.C., Tex., Utah, Va., Wash., Wyo., Mexico, South America

Discussion

Pseudognaphalium stramineum is probably native from South America to western North America; it is adventive in sandy fields on the Atlantic coastal plain, where it flowers May–Aug.

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 +
paniculiform +  and corymbiform +
indeterminate +  and determinate +
Guy L. Nesom +
(Kunth) Anderberg +
subclasping +
decurrent +
0.1 cm1 mm <br />0.001 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
Gnaphalium stramineum +
compound +  and simple +
mostly narrowly lanceolate;oblanceolate +
5-ribbed +, 3-ribbed +  and 2-ribbed +
muriculate +, papillate +  and smooth +
Cotton-batting-plant +
actinomorphic +
B.C. +, Ariz. +, Calif. +, Colo. +, Idaho +, Mont. +, Nebr. +, Nev. +, N.Mex. +, N.Y. +, N.C. +, Okla. +, Oreg. +, S.C. +, Tex. +, Utah +, Va. +, Wash. +, Wyo. +, Mexico +  and South America +
10–1600 m +
gray-tomentose +
papillate-roughened +
winged +  and beaked +
dispersed +
Sandy fields, streamsides, washes, swales, dunes, chaparral slopes, roadsides, fields, disturbed places, moist disturbed places +
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 />) +
subglobose +
0.4 cm4 mm <br />0.004 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
8 cm80 mm <br />0.08 m <br /> (9.5 cm95 mm <br />0.095 m <br />) +
0.5 cm5 mm <br />0.005 m <br /> (1 cm10 mm <br />0.01 m <br />) +
2 cm20 mm <br />0.02 m <br /> (8 cm80 mm <br />0.08 m <br />) +
oblong;narrowly oblanceolate or subspatulate +
cauline +  and basal +
rarely lanceovate +  and lanceolate +
revolute +  and flat +
2-carpellate +
persistent +
Flowering Mar–Oct. +
bearing subulate enations +, hairy +  and bristly +
conic;more or less columnar +
4 +  and 6 +
exalbuminous +
Illustrated +
decumbent +  and procumbent +
appendaged +  and truncate +
papillate +
Gnaphalium chilense +, Gnaphalium chilense var. confertifolium +, Gnaphalium gossypinum +, Gnaphalium lagopodioides +, Gnaphalium proximum +  and Gnaphalium sulphurescens +
Pseudognaphalium stramineum +
Pseudognaphalium +
species +
60 cm600 mm <br />0.6 m <br /> (80 cm800 mm <br />0.8 m <br />) +
biennial +  and annual +
30 cm300 mm <br />0.3 m <br /> (60 cm600 mm <br />0.6 m <br />) +
shrub +  and subshrub +