Amphiachyris amoena

(Shinners) Solbrig

Rhodora 62: 52. 1960.

Common names: Texas broomweed
Endemic
Basionym: Xanthocephalum amoenum Shinners Field & Lab. 19: 77. 1951 Gutierrezia amoena (Shinners) Diggs Lipscomb & O’Kennon
Treatment appears in FNA Volume 20. Treatment on page 88.

Plants 20–40 (–60) cm. Primary-stems usually (2–) 5 mm diam. Leaf-blades linear, rarely linear-lanceolate, 5–25 (–35) × 0.2–1 (–2) mm. Heads in open paniculiform arrays. Phyllaries 3–4 × 1–2 mm. Receptacles with hooked, swollen-based hairs. Cypselae 2–3 mm, 4–6-ribbed, long-setulose. 2n = 8.


Phenology: Flowering late Sep–Oct.
Habitat: Calcareous soils and gravels on or near limestone outcrops
Elevation: 0–650 m

Discussion

Selected References

None.

Lower Taxa

None.
... more about "Amphiachyris amoena"
not tailed +, rounded +  and obtuse +
distinct +
subequal +
scarious +
usually triangular +  and linear +
usually deltate +  and lanceolate +
paniculiform +  and open +
indeterminate +  and determinate +
Guy L. Nesom +
(Shinners) Solbrig +
decurrent +
Xanthocephalum amoenum +  and Gutierrezia amoena +
compound +  and simple +
linear;lanceolate +
rugulose +  and muricate +
barbellulate +  and barbellate +
Texas broomweed +
not 2-lipped +  and actinomorphic +
yellow +  and orange-tinged +
long-setulose +
obovoid-turbinate +
fertile +  and bisexual +
0–650 m +
resinous +
whitish;gland-dotted +
short-setulose +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Calcareous soils and gravels on or near limestone outcrops +
swollen-based +
indeterminate +
heterogamous +  and homogamous +
each +  and sessile +
0.2 cm2 mm <br />0.002 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
narrowly campanulate;turbinate +
2.5 cm25 mm <br />0.025 m <br /> (3.5 cm35 mm <br />0.035 m <br />) +
0.1 cm1 mm <br />0.001 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
0.5 cm5 mm <br />0.005 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
0.02 cm0.2 mm <br />2.0e-4 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
deltate +
2-carpellate +
coroniform +
Flowering late Sep–Oct. +
0.3 cm3 mm <br />0.003 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
0.1 cm1 mm <br />0.001 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
5 cm50 mm <br />0.05 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
bearing subulate enations +, hairy +  and bristly +
flat;slightly convex +
exalbuminous +
appendaged +  and truncate +
papillate +  and smooth +
Compositae +
Amphiachyris amoena +
Amphiachyris +
species +
cylindric +
100 cm1,000 mm <br />1 m <br /> (200 cm2,000 mm <br />2 m <br />) +
20 cm200 mm <br />0.2 m <br /> (100 cm1,000 mm <br />1 m <br />) +