Flora of North America species comparison

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Amphiachyris

broomweed
Habit Annuals, 20–100(–200) cm (glabrous, with strong terpenoid smell when crushed; taprooted).
Stems

erect, usually branched distally (bases usually lignescent).
Leaves

cauline; alternate;

sessile;

blades (1- or 3-nerved) linear to lanceolate, margins entire, faces gland-dotted.
Involucres

narrowly campanulate to turbinate, 2–4 mm diam.
Receptacles

flat to slightly convex, smooth (glabrous or hairy with multicellular, 1-seriate hairs), epaleate.
Ray florets

7–12, pistillate, fertile;

corollas yellow, sometimes drying orange-tinged.
Disc florets

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).
Phyllaries

12–15 in 1–2(–3) series, 1-nerved (nerves without green margins) ovate, unequal, proximal 2/3 indurate, margins hyaline, faces whitish resinous.
Heads

radiate, in paniculiform or corymbiform arrays.
Cypselae

(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.
x

= 4, 5.

Amphiachyris
Distribution
from USDA
c United States
[BONAP county map]
Discussion

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.)
Key
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
Source FNA vol. 20, p. 87. Author: Guy L. Nesom.
Parent taxa Asteraceae > tribe Astereae
Subordinate taxa
A. amoena, A. dracunculoides
Synonyms Brachyris section A.
Name authority (de Candolle) Nuttall: Trans. Amer. Philos. Soc., n. s. 7: 313. (1840)
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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