Calflora
Taxon  Report   8370    
Xylorhiza cognata  (H. M. Hall) T. J. Watson
Mecca aster,  Mecca woodyaster
Xylorhiza cognata
© 2012 Keir Morse
Photos from
CalPhotos / Calflora
Xylorhiza cognata
© 2011 Aaron E. Sims
Xylorhiza cognata, a dicot, is a perennial herb that is native to California, is endemic (limited) to California.
also called Machaeranthera cognata
CNPS Rare Plant Rank: 1B.2 (rare, threatened, or endangered in CA and elsewhere).   8th Edition

Interactive Distribution Map


Observation Hotline
(observation details + photos)



point, line, or polygon

one or more occurrences
within a 7.5-minute quadrangle

Plant Characteristics
and Associations



Bloom Period
Xylorhiza cognata
© 2011 Aaron E. Sims
Family: ASTERACEAE  
Genus: Xylorhiza
Communities: Creosote Bush Scrub
Name Status:
Accepted by JEF + CNPS + PLANTS

Alternate Names:
PLANTS: Aster cognatus
PLANTS: Aster standleyi
PLANTS: Xylorhiza standleyi
. . .
More information about  Xylorhiza cognata
Nursery / seed vendor availability from CNPLX
Commercial availability unknown.
Landscaping information from Calscape
Photos on PlantID.net   /   Google Images
Jepson eFlora

Records from the Consortium of California Herbaria

ITIS Original Publication citation

USDA PLANTS Profile (XYCO2)

Search the International Plants Names Index

Search efloras.org (Flora of North America)

website references from Google


Suggested Citation
Calflora: Information on California plants for education, research and conservation,
with data contributed by public and private institutions and individuals, including the Consortium of California Herbaria.
[web application]. 2018. Berkeley, California: The Calflora Database [a non-profit organization].
Available: https://www.calflora.org/   (Accessed: Nov 15, 2018).

The information on this page comes from diverse sources. None of the links are sponsored.