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)

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
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   /   Google Images
Jepson eFlora

Records from the Consortium of California Herbaria

ITIS Original Publication citation


Search the International Plants Names Index

Search (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]. 2019. Berkeley, California: The Calflora Database [a non-profit organization]. Available:   (Accessed: Jan 20, 2019).