Flora of North America species comparison

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Centromadia pungens

common spikeweed, common tarweed
Habit Plants 10–120 cm.
Leaves

glabrous (but for bristly-ciliate margins and midribs), scabrous, or hirsute (not glandular).
Involucres

3–6 mm.
Anthers

yellow to brownish.
Pappi

0.

Centromadia pungens
Distribution
from FNA
AZ; CA; ID; NV; NY; OR; WA; nw Mexico
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[BONAP county map]
Discussion

Subspecies 2 (2 in the flora).

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Key
1. Leaves: margins bristly-ciliate, faces glabrous but for bristly midribs; paleae little, if at all, exserted, apices obtuse to acute, sometimes apiculate
subsp. laevis
1. Leaves: margins sometimes ciliate, faces glabrous, scabrous, or hirsute, midribs sometimes bristly; paleae often conspicuously exserted, apices ± attenuate, spine-tipped
subsp. pungens
Source FNA vol. 21, p. 277.
Parent taxa Asteraceae > tribe Heliantheae > subtribe Madiinae > Centromadia
Sibling taxa
C. fitchii, C. parryi
Subordinate taxa
C. pungens subsp. laevis, C. pungens subsp. pungens
Synonyms Hartmannia pungens, Hemizonia pungens
Name authority (Hooker & Arnott) Greene: Man. Bot. San Francisco, 196. (1894)
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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