Amphiachyris dracunculoides
Amphiachyris
common broomweed, prairie broomweed
broomweed
erect, usually branched distally (bases usually lignescent).
blades narrowly to broadly lanceolate, 5–60 × 0.5–6 mm.
cauline; alternate;
sessile;
blades (1- or 3-nerved) linear to lanceolate, margins entire, faces gland-dotted.
narrowly campanulate to turbinate, 2–4 mm diam.
deeply pitted, glabrous.
flat to slightly convex, smooth (glabrous or hairy with multicellular, 1-seriate hairs), epaleate.
7–12, pistillate, fertile;
corollas yellow, sometimes drying orange-tinged.
10–21, functionally staminate;
corollas yellow, tubes shorter than cylindric throats, lobes 5, erect, deltate;
style-branch appendages fused (pappi of 5–8 white, basally connate, linear, spatulate-tipped scales in 1 series, ± equaling corollas).
2–3 × 1–2 mm.
12–15 in 1–2(–3) series, 1-nerved (nerves without green margins) ovate, unequal, proximal 2/3 indurate, margins hyaline, faces whitish resinous.
in crowded corymbiform arrays.
radiate, in paniculiform or corymbiform arrays.
1.2–2.2 mm, 7–9-ribbed, short-setulose.
(ray, purplish black) obovoid-turbinate, plump, 4–9-ribbed (apices attenuate to slightly clavate), faces densely long- or short-setulose (hairs appressed, white), mostly occurring in lines between ribs;
pappi coroniform.
stems 0.3–1(–2) mm diam.
= 4, 5.
= 10 (rarely 8).
Amphiachyris dracunculoides
Amphiachyris
Amphiachyris dracunculoides is common in the south-central states, often in relatively large populations.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
Species 2 (2 in the flora).
Amphiachyris was recently treated within a more inclusive Gutierrezia (G. M. Diggs et al. 1999); apparently, it is more closely related to monotypic Thurovia than to Gutierrezia (Y. Suh and B. B. Simpson 1990). Amphiachyris is distinguished from Gutierrezia by a combination of glandular hairs only on the abaxial leaf faces, functionally staminate disc florets, disc pappi of basally connate, narrowly spatulate scales ± equaling corollas, and abaxial nerves of the phyllaries without green borders.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
1. Plants 20–40(–60) cm; heads in open paniculiform arrays; cypselae 4–6-ribbed, long-setulose; leaf blades 0.2–1(–2) mm wide; receptacles with hooked, swollen-based hairs | A. amoena |
1. Plants 30–100(–200) cm; heads in crowded corymbiform arrays; cypselae 7–9-ribbed, short-setulose; leaf blades 0.5–6 mm wide; receptacles glabrous | A. dracunculoides |
IL Wildflowers
KS Wildflowers
LA Plants
MO Plants
WildflowerSearch
iNaturalist
USDA Plants Database
