Flora of North America species comparison

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Centromadia fitchii

Fitch's spikeweed, Fitch's tarweed, spikeweed
Habit Plants 5–50 cm.
Leaves

densely villous or hirsute, stipitate-glandular (glands yellow, brown, or black).
Involucres

5–10 mm.
Anthers

reddish to dark purple.
Pappi

of 8–12 narrowly oblanceolate to linear scales.
2n

= 26.

Centromadia fitchii
Phenology Flowering May–Nov.
Habitat Grasslands, ± alkaline plains, vernal pool edges and beds, disturbed sites (e.g., fallow fields), open woodlands, sometimes on serpentine
Elevation 0–1000 m (0–3300 ft)
Distribution
from FNA
CA; OR
[WildflowerSearch map]
[BONAP county map]
Discussion

Centromadia fitchii occurs widely in northern and central California (except deserts) and southwestern Oregon and has putatively introduced populations in southwestern California. Unlike most other members of Centromadia, C. fitchii often occurs in upland, presumably well-drained sites. Putative natural hybrids with C. parryi subsp. rudis have been noted (e.g., D. D. Keck 2573, UC, from San Joaquin Co., California).

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 21, p. 277.
Parent taxa Asteraceae > tribe Heliantheae > subtribe Madiinae > Centromadia
Sibling taxa
C. parryi, C. pungens
Synonyms Hemizonia fitchii
Name authority (A. Gray) Greene: Man. Bot. San Francisco, 197. (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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