Psilostrophe cooperi

(A. Gray) Greene

Pittonia 2: 176. 1891.

Basionym: Riddellia cooperi A. Gray Proc. Amer. Acad. Arts 7: 358. 1868
Treatment appears in FNA Volume 21. Treatment on page 454. Mentioned on page 453.

Shrubs or subshrubs, (15–) 25–30 (–50+) cm. Stems pannose (white). Heads borne singly. Peduncles 35–60 (–80+) mm. Involucres 6–8 mm. Rays 3–6; laminae (8–) 12–20 mm, spreading to reflexed in fruit. Disc-florets (6–) 10–17 (–25). Cypselae usually glabrous, sometimes glanddotted; pappi of 4–6 oblong to ± lanceolate scales 2–2.5 mm. 2n = 32.


Phenology: Flowering (Feb–)Apr–Jun(–Dec).
Habitat: Creosote-bush scrub, sandy washes
Elevation: 100–2100 m

Distribution

V21-1139-distribution-map.gif

Ariz., Calif., Nev., Utah, Mexico (Baja California), Mexico (Sonora)

Discussion

Selected References

None.

Lower Taxa

None.
... more about "Psilostrophe cooperi"
not tailed +, rounded +  and obtuse +
connate +  and distinct +
subequal +
scarious +
usually ovate +  and lanceolate +
usually deltate +  and lanceolate +
indeterminate +  and determinate +
John L. Strother +
(A. Gray) Greene +
decurrent +
Riddellia cooperi +
compound +  and simple +
spatulate;oblanceolate or linear +
winged;ribbed;winged;ribbed +
tuberculate +  and rugose +
barbellulate +  and barbellate +
yellow +  and orange +
obcompressed +, cylindric +  and clavate or obpyramidal +
fertile +  and bisexual +
fertile +  and bisexual +
Ariz. +, Calif. +, Nev. +, Utah +, Mexico (Baja California) +  and Mexico (Sonora) +
100–2100 m +
strigillose +  and arachno-villous +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Creosote-bush scrub, sandy washes +
glomerulate +
indeterminate +
homogamous +  and heterogamous +
each +  and sessile +
0.2 cm2 mm <br />0.002 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
cylindric;campanulate or obconic +
0.6 cm6 mm <br />0.006 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
0.8 cm8 mm <br />0.008 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
spreading +  and reflexed +
1.2 cm12 mm <br />0.012 m <br /> (2 cm20 mm <br />0.02 m <br />) +
sessile +  and petiolate +
cauline +, all +  and basal +
deltate +
connate +  and distinct +
ovate +, oblong +, oblanceolate +, linear +, lanceolate +  and elliptic +
unequal +  and subequal +
2-carpellate +
persistent +
4 +  and 6 +
oblong +  and more or less lanceolate +
6 cm60 mm <br />0.06 m <br /> (8 cm80 mm <br />0.08 m <br />) +
3.5 cm35 mm <br />0.035 m <br /> (6 cm60 mm <br />0.06 m <br />) +
Flowering (Feb–)Apr–Jun(–Dec). +
5 +  and 12 +
bearing subulate enations +, hairy +  and bristly +
pitted +  and smooth +
convex;flat +
4 +  and 8 +
less oblong or elliptic +  and lanceolate or lance-subulate +
0.2 cm2 mm <br />0.002 m <br /> (0.25 cm2.5 mm <br />0.0025 m <br />) +
exalbuminous +
erect +  and spreading +
appendaged +  and truncate +
hirsutulous +  and glabrous +
papillate +
Compositae +
Psilostrophe cooperi +
Psilostrophe +
species +
cylindric +
dilated +
toothed +  and entire +
perennial +  and biennial +
30 cm300 mm <br />0.3 m <br /> (50 cm500 mm <br />0.5 m <br />) +
subshrub +  and shrub +