Flora of North America species comparison

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Amphipappus fremontii

Amphipappus

chaffbush, eytelia, Fremont's chaff bush

chaff-bush
Habit Shrubs, 30–60 cm (rounded).
Stems

erect (bark whitish), intricately branched, becoming leafless and spinescent, branchlets glabrous or densely, hirtellous.
Leaves

3–11 mm.

cauline; alternate (ascending); petiolate to subsessile;

blades 1-nerved, obovate to narrowly elliptic, margins entire, faces glabrous or hirtellous, often resinous.
Involucres

turbino-cylindric, 4–5.5 × 2–3 mm.
Receptacles

flat, pitted, epaleate.
Ray florets

(0–)1–2, pistillate, fertile;

corollas yellow (laminae slightly longer than involucres).
Disc florets

3–7, functionally staminate;

corollas yellow, tubes longer than narrowly funnelform throats (nerves 1, yellow, not resinous), lobes 5, reflexed or coiling back, lanceolate;

style-branch appendages triangular (nonfunctional, lacking stigmatic lines).
Phyllaries

7–12 in 3 series, greenish white, 1-nerved (outer keeled), ovate to elliptic, unequal, thin-indurate, margins not scarious, faces glabrous.
Heads

radiate (discoid), (2–4) in glomerate, terminal clusters, these in corymbiform arrays.
Cypselae

(ray) 3 mm

(ray) oblong-elliptic to obovoid, ± flattened, 2-nerved, faces moderately villous;

pappi persistent, of 15–20, stramineous, basally connate, flattened, slender, barbellate, apically attenuate bristles in 1 series (disc bristles longer than ray, sometimes undulate or twisted).
x

= 9.

Amphipappus fremontii

Amphipappus
Distribution
from FNA
AZ; CA; NV; UT
[WildflowerSearch map]
[BONAP county map]
from USDA
sw United States
[BONAP county map]
Discussion

Varieties 2 (2 in the flora).

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Species 1.

Amphipappus is characterized by its low-shrubby, intricately branched habit and corymbiform, glomerate clusters of small, few-flowered heads, functionally staminate disc florets, and pappi of short, barbellate bristles, the fertile ray cypselae with pappi of shorter, flattened bristles. The genus is restricted to the Mojave Desert of California, Nevada, Utah, and Arizona where these states are contiguous.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Key
1. Young twigs, peduncles, and leaves glabrous
var. fremontii
1. Young twigs, peduncles, and leaves densely, hirtellous
var. spinosus
Source FNA vol. 20, p. 186. FNA vol. 20, p. 186. Author: Guy L. Nesom.
Parent taxa Asteraceae > tribe Astereae > Amphipappus Asteraceae > tribe Astereae
Subordinate taxa
A. fremontii var. fremontii, A. fremontii var. spinosus
A. fremontii
Name authority Torrey & A. Gray: Boston J. Nat. Hist. 5: 108. (1845) Torrey & A. Gray: Boston J. Nat. Hist. 5: 107. (1845)
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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