Gamochaeta ustulata

(Nuttall) Holub

Folia Geobot. Phytotax. 11: 83. 1976.

Common names: Featherweed Pacific cudweed
Endemic
Basionym: Gnaphalium ustulatum Nuttall Trans. Amer. Philos. Soc., n. s. 7: 404. 1841
Synonyms: Gnaphalium pannosum Gandoger Gnaphalium purpureum var. ustulatum (Nuttall) B. Boivin
Treatment appears in FNA Volume 19. Treatment on page 435. Mentioned on page 432.

Annuals, biennials, or perennials, 10–40 cm; fibrous-rooted. Stems erect to ascending (commonly decumbent-ascending and rhizome like), densely white-pannose. Leaves basal and cauline, basal usually withering before flowering, blades spatulate to oblanceolate, 2–5 cm × 6–12 (–35) mm (little smaller distally), faces bicolor, abaxial white-pannose, adaxial sparsely to densely arachnose-tomentose. Heads in usually continuous, rarely interrupted (proximally), cylindric arrays 1–6 (–8+) cm × 12–18 mm (pressed). Involucres campanulo-urceolate, 4.5–5 mm, bases sparsely arachnose. Phyllaries in 4–6 series, outer (brown or greenish brown) broadly ovate-triangular, lengths ca. 1/2 inner, apices acute to acute-acuminate (mid phyllaries ± keeled near apices), inner oblong, laminae usually dark-brown, sometimes purplish (at stereome-lamina junction), apices rounded to obtuse, apiculate. Florets: bisexual (3–) 4–6; all corollas usually yellowish, sometimes purplish distally. Cypselae (tan to brownish) 0.7–0.8 mm.


Phenology: Flowering Apr–Jul(–Oct).
Habitat: Mostly coastal and near-coastal sites, dunes, ocean bluffs, sandy fields, and roadsides, clay-loam, roadcuts, ditches, cliffs, pine woods, chaparral slopes, tidal marsh edges
Elevation: 0–700(–1100) m

Distribution

V19-717-distribution-map.gif

B.C., Calif., Oreg., Wash.

Discussion

Gamochaeta ustulata usually has been included in G. purpurea; it differs mostly in its longer duration, thicker and shorter stems, larger, more compact arrays of larger, brown heads, and aspects of phyllary morphology.

Selected References

None.

Lower Taxa

None.
... more about "Gamochaeta ustulata"
gray +  and white +
pannose-tomentose +  and tomentose +
subpannose +, tomentose +, arachnose +, glabrous +  and glabrescent +
acute +  and acute-acuminate +
scarious +
mostly ovate +  and lanceovate or linear +
interrupted +  and continuous +
6 cm60 mm <br />0.06 m <br /> (8 cm80 mm <br />0.08 m <br />) +
indeterminate +  and determinate +
1 cm10 mm <br />0.01 m <br /> (6 cm60 mm <br />0.06 m <br />) +
cylindric +
12mm +  and 18mm +
Guy L. Nesom +
(Nuttall) Holub +
cuneate +  and more or less cordate +
Gnaphalium ustulatum +
compound +  and simple +
1.2 cm12 mm <br />0.012 m <br /> (3.5 cm35 mm <br />0.035 m <br />) +
2 cm20 mm <br />0.02 m <br /> (5 cm50 mm <br />0.05 m <br />) +
arachnose-tomentose +  and white-pannose +
spatulate;oblanceolate +
6mm;12mm +
5-ribbed +, 3-ribbed +  and 2-ribbed +
muriculate +, papillate +  and smooth +
Featherweed +  and Pacific cudweed +
actinomorphic +
purplish +  and yellowish +
flattened +  and oblong +
B.C. +, Calif. +, Oreg. +  and Wash. +
0–700(–1100) m +
1.2 cm12 mm <br />0.012 m <br /> (3.5 cm35 mm <br />0.035 m <br />) +
2 cm20 mm <br />0.02 m <br /> (5 cm50 mm <br />0.05 m <br />) +
arachnose-tomentose +  and white-pannose +
spatulate;oblanceolate +
0.6 cm6 mm <br />0.006 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
winged +  and beaked +
dispersed +
Mostly coastal and near-coastal sites, dunes, ocean bluffs, sandy fields, and roadsides, clay-loam, roadcuts, ditches, cliffs, pine woods, chaparral slopes, tidal marsh edges +
papilliform +
singly +  and aggregated +
indeterminate +
homogamous +  and heterogamous +
each +  and sessile +
campanulo-urceolate +
0.45 cm4.5 mm <br />0.0045 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
purplish +  and dark-brown +
basal +  and cauline +
rarely lanceovate +  and lanceolate +
ovate-triangular +
2-carpellate +
persistent +
Flowering Apr–Jul(–Oct). +
Folia Geobot. Phytotax. +
conic;more or less columnar +
exalbuminous +
erect +  and ascending +
appendaged +  and truncate +
papillate +
Gnaphalium pannosum +  and Gnaphalium purpureum var. ustulatum +
Gamochaeta ustulata +
Gamochaeta +
species +
1 cm10 mm <br />0.01 m <br /> (5 cm50 mm <br />0.05 m <br />) +
perennial +, biennial +  and annual +
10 cm100 mm <br />0.1 m <br /> (40 cm400 mm <br />0.4 m <br />) +
shrub +  and subshrub +