The Jepson eFlora version of my Malacothamnus treatment is now online and you can find it here. This means that my treatment is now the officially recognized treatment for Malacothamnus in California, which encompasses most of the range of the genus.

The Jepson version is simplified and abridged, so I recommend using the full version available for free here, which is better in having more explanations, natural history information, diagnostic photos, maps, and includes key couplets for both Arizona and Mexico. The Jepson maps will possibly take quite a bit of time to approach being correct as they are based on specimens, most of which I've annotated, but most of those annotations have not been updated in databases at this point. The maps in the full version are better in that they show multiple taxa on the same maps, so you can see where taxa come together and where intermediates likely occur. The Jepson version does not have the diagnostic figures for most taxa but each taxon page does link to photos I've posted on Calphotos, which are all correctly identified at this point but someone could post some misidentified ones there in the future. The full version contains a full-page figure for each taxon showing diagnostic characters.