Psilactis asteroides

A. Gray

Mem. Amer. Acad. Arts, n. s. 4: 72. 1849.

Illustrated
Synonyms: Aster boltoniae Greene Machaeranthera boltoniae (Greene) B. L. Turner & D. B. Horne Psilactis leptos Shinners
Treatment appears in FNA Volume 20. Treatment on page 464. Mentioned on page 462.

Annuals, 25–150 cm. Stems and branches often sparsely appressed-hairy, stipitate-glandular distally, occasionally proximally. Distal leaf-blades lanceolate to narrowly elliptic or linear, smallest 2.5–5 × 0.7–1.5 mm, bases cuneate to slightly cordate, sometimes slightly clasping. Involucres hemispheric, 4–5 mm. Phyllaries unequal; outer oblong to narrowly elliptic to lanceolate, 2–2.5 × 0.6–0.9 mm, mostly herbaceous, bases inconspicuously indurate, scarious margins absent or obscured by stipitate-glands; inner oblanceolate to lanceolate or linear-lanceolate, 3–5 × 0.7–1 mm, bases indurate, margins scarious. Receptacles flat to convex, 1.8–4 mm wide. Ray-florets 20–40; laminae 5–9 × 0.5–1 mm. Disc-florets 40–75; corollas 2–3.5 mm. Ray cypselae 1–1.8 mm, sparsely appressed-hairy. Disc cypselae 1.2–2.2 mm, sparsely appressed-hairy; pappi 30–45, 1.5–3 mm. 2n = 8.


Phenology: Flowering May–Nov.
Habitat: Wet or occasionally flooded habitats, stream banks, lakeshores, ditches, fields, disturbed areas
Elevation: 900–2100 m

Distribution

V20-1072-distribution-map.gif

Ariz., N.Mex., Tex., Mexico

Discussion

Psilactis asteroides grows in eastern Arizona and western New Mexico and Texas.

Selected References

None.

Lower Taxa

None.

"[" is not declared as a valid unit of measurement for this property."]" is not declared as a valid unit of measurement for this property.

... more about "Psilactis asteroides"
not tailed +, rounded +  and obtuse +
distinct +
subequal +
scarious +
usually triangular +  and linear +
usually deltate +  and lanceolate +
indeterminate +  and determinate +
David R. Morgan +
A. Gray +
obovate +  and linear-oblanceolate +
cuneate +  and slightly cordate +
indurate +
compound +  and simple +
rugulose +  and muricate +
stipitate-glandular +  and appressed-hairy +
barbellulate +  and barbellate +
not 2-lipped +  and actinomorphic +
yellow +, white +  and blue or purple +
0.2 cm2 mm <br />0.002 m <br /> (0.35 cm3.5 mm <br />0.0035 m <br />) +
beaked +, 2-ribbed +  and 5-ribbed +
compressed +, fusiform +  and clavate or obovoid +
fertile +  and bisexual +
white;tawny +
appressed-hairy +
0.12 cm1.2 mm <br />0.0012 m <br /> (0.22 cm2.2 mm <br />0.0022 m <br />) +
persistent +
fertile +  and bisexual +
unequal +
ovate;lanceolate +
linear +  and elliptic +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
0.07 cm0.7 mm <br />7.0e-4 m <br /> (0.15 cm1.5 mm <br />0.0015 m <br />) +
Ariz. +, N.Mex. +, Tex. +  and Mexico +
900–2100 m +
appressed-hairy +  and stipitate-glandular +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Wet or occasionally flooded habitats, stream banks, lakeshores, ditches, fields, disturbed areas +
indeterminate +
heterogamous +  and homogamous +
each +  and sessile +
0.3 cm3 mm <br />0.003 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
oblanceolate +  and lanceolate or linear-lanceolate +
0.07 cm0.7 mm <br />7.0e-4 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
hemispheric +
0.4 cm4 mm <br />0.004 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
0.5mm;1mm +
cauline +  and basal +
deltate +  and lanceolate +
lobed +, toothed +  and entire +
0.2 cm2 mm <br />0.002 m <br /> (0.25 cm2.5 mm <br />0.0025 m <br />) +
0.06 cm0.6 mm <br />6.0e-4 m <br /> (0.09 cm0.9 mm <br />9.0e-4 m <br />) +
2-carpellate +
30 cm300 mm <br />0.3 m <br /> (45 cm450 mm <br />0.45 m <br />) +
Flowering May–Nov. +
lanceolate +  and linear +
obovate +  and linear-oblanceolate +
Mem. Amer. Acad. Arts, n. s. +
appressed-hairy +
0.1 cm1 mm <br />0.001 m <br /> (0.18 cm1.8 mm <br />0.0018 m <br />) +
bearing subulate enations +, hairy +  and bristly +
pitted +  and verrucose +
flat;convex +
0.18 cm1.8 mm <br />0.0018 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
exalbuminous +
Illustrated +
ascending +  and erect +
stipitate-glandular +  and appressed-hairy +
appendaged +  and truncate +
papillate +  and smooth +
Aster boltoniae +, Machaeranthera boltoniae +  and Psilactis leptos +
Psilactis asteroides +
Psilactis +
species +
25 cm250 mm <br />0.25 m <br /> (150 cm1,500 mm <br />1.5 m <br />) +
tree +, shrub +  and subshrub +
9 +, 4 +  and 3 +