Amphiachyris dracunculoides

(de Candolle) Nuttall

Trans. Amer. Philos. Soc., n. s. 7: 313. 1840.

Common names: Prairie broomweed
IllustratedEndemic
Basionym: Brachyris dracunculoides de Candolle Mém. Soc. Phys. Genève 7: 265. 1836
Synonyms: Gutierrezia dracunculoides (de Candolle) S. F. Blake Xanthocephalum amoenum var. intermedium Shinners
Treatment appears in FNA Volume 20. Treatment on page 88.

Plants 30–100 (–200) cm. Primary-stems 0.3–1 (–2) mm diam. Leaf-blades narrowly to broadly lanceolate, 5–60 × 0.5–6 mm. Heads in crowded corymbiform arrays. Phyllaries 2–3 × 1–2 mm. Receptacles deeply pitted, glabrous. Cypselae 1.2–2.2 mm, 7–9-ribbed, short-setulose. 2n = 10 (rarely 8).


Phenology: Flowering Jul–Nov.
Habitat: Calcareous, clay, or sandy soils, disturbed habitats
Elevation: 0–500 m

Distribution

V20-169-distribution-map.gif

Ala., Ark., Ill., Ind., Iowa, Kans., Ky., La., Miss., Mo., Nebr., N.Mex., Okla., Ohio, Pa., S.C., Tenn., Va.

Discussion

Amphiachyris dracunculoides is common in the south-central states, often in relatively large populations.

Selected References

None.

Lower Taxa

None.
not tailed +, rounded +  and obtuse +
distinct +
subequal +
scarious +
usually triangular +  and linear +
usually deltate +  and lanceolate +
indeterminate +  and determinate +
Guy L. Nesom +
(de Candolle) Nuttall +
decurrent +
Brachyris dracunculoides +
compound +  and simple +
linear;lanceolate +
rugulose +  and muricate +
barbellulate +  and barbellate +
Prairie broomweed +
not 2-lipped +  and actinomorphic +
yellow +  and orange-tinged +
short-setulose +
obovoid-turbinate +
fertile +  and bisexual +
Ala. +, Ark. +, Ill. +, Ind. +, Iowa +, Kans. +, Ky. +, La. +, Miss. +, Mo. +, Nebr. +, N.Mex. +, Okla. +, Ohio +, Pa. +, S.C. +, Tenn. +  and Va. +
0–500 m +
resinous +
whitish;gland-dotted +
short-setulose +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Calcareous, clay, or sandy soils, disturbed habitats +
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 +
0.5 cm5 mm <br />0.005 m <br /> (6 cm60 mm <br />0.06 m <br />) +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
deltate +
2-carpellate +
coroniform +
Flowering Jul–Nov. +
0.2 cm2 mm <br />0.002 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
0.1 cm1 mm <br />0.001 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
0.03 cm0.3 mm <br />3.0e-4 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
Trans. Amer. Philos. Soc., n. s. +
flat;slightly convex +
exalbuminous +
Illustrated +  and Endemic +
appendaged +  and truncate +
papillate +  and smooth +
Gutierrezia dracunculoides +  and Xanthocephalum amoenum var. intermedium +
Amphiachyris dracunculoides +
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 />) +