Amphiachyris dracunculoides
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
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.
... more about "Amphiachyris dracunculoides"
introrse +
connate +
distinct +
herbaceous +
scarious +
hirsute +
papillate +
corymbiform +
crowded +
continuous +
decurrent +
linear;lanceolate +
ribbed +
stigmatic +
persistent +
absent +
Prairie broomweed +
drying +
absent +
monomorphic +
7-9-ribbed +
dimorphic +
short-setulose +
obovoid-turbinate +
plump +
1.2mm;2.2mm +
staminate +
staminate +
straight +
resinous +
whitish;gland-dotted +
long +
short-setulose +
distinct +
proximal +
1;5 +
bisexual +
dispersed +
singly +
indeterminate +
Present +
surrounding +
narrowly campanulate;turbinate +
lanceolate +
0.5mm;6mm +
sessile +
alternate +
cauline +
erect +
deltate +
hyaline +
2-carpellate +
inferior +
attached +
anatropous +
coroniform +
tough +
thick +
absent +
connate +
1-nerved +
persistent +
distinct +
falling +
proximal +
ovate +
unequal +
Trans. Amer. Philos. Soc., n. s. +
1840 +
pistillate +
absent +
fertile +
epaleate +
glabrous +
pitted +
flat;slightly convex +
fibrous +
exalbuminous +
modifed +
1;2 +
alternate +
branched +
erect +
2-branched +
glabrous +
Amphiachyris dracunculoides +
Amphiachyris +
species +
cylindric +
shorter +
annual +