Flora of North America species comparison

The green links below add additional plants to the comparison table. Blue links lead to other Web sites.
enable glossary links

Parthenium alpinum

alpine feverfew, Arkansas River feverfew
Habit Perennials, 1–2 cm (underground caudices 2–5+ cm, branched; plants cespitose or forming mats).
Leaf

blades oblanceolate to spatulate, 6–18(–35) × 1–3(–4+) mm, margins entire, faces strigilloso-sericeous (gray) and obscurely gland-dotted.
Peduncles

0–5(–30) mm.
Pistillate florets

5–8;

corolla laminae 0 (tubes ± compressed, obscurely 2–4-lobed).
Disc florets

18–28+.
Phyllaries

outer 5–8 ± linear, 4 mm, inner 5–8 ± orbiculate, 4–5 mm.
Heads

± disciform, borne singly.
Cypselae

oblanceoloid, 4 mm (narrowly winged); pappus-like enations 2, erect to spreading, ± subulate, 0.5–1 mm (a third, ± subulate element sometimes at apex of adaxial face).
2n

= 36.

Parthenium alpinum
Phenology Flowering May–Jul.
Habitat Shale and calcareous outcrops, red clays
Elevation 1300–1700 m (4300–5600 ft)
Distribution
from FNA
CO; NM; WY
[WildflowerSearch map]
[BONAP county map]
Discussion

Parthenium alpinum is in the Center for Plant Conservation’s National Collection of Endangered Plants.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 21, p. 21.
Parent taxa Asteraceae > tribe Heliantheae > subtribe Ambrosiinae > Parthenium
Sibling taxa
P. argentatum, P. confertum, P. hysterophorus, P. incanum, P. integrifolium, P. ligulatum
Synonyms Bolophyta alpina, P. tetraneuris, P. alpinum var. tetraneuris
Name authority (Nuttall) Torrey & A. Gray: Fl. N. Amer. 2: 285. (1842)
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).



Type/paste one or more Latin names into the boxes above; matching taxa will show up below the box as you type. You can use the up/down arrow keys to move through the list.

(If the plant you're looking for doesn't show up in the auto-complete list, that means it either isn't described in Flora of North America yet, or it's listed under a synonym. And please note that Flora of North America is still missing several plant families, including Fabaceae, Apiaceae, Boraginaceae, and Polemoniaceae.)

Choose a data source: Flora of North America

The species comparison tool is brought to you by:
Northwest Wildflowers