Crassula cotyledonis Thunb.
Syn: Crassula dubia
Syn: Crassula cephalophora var. dubia
Before I get started, please allow me to vent just a little… First of all, even though the industry labels this plant as Crassula Dudia and says it is a Propeller Plant, IT IS NOT! There is no such species as Crassula Dudia and the PROPELLER PLANT is Crassula perfoliata var. falcata… It is VERY INTERESTING how many people have bought this plant and there is hardly any information, correct information, about it online. Most information about growing this plant is NOT for the correct species at all. Website after website list this plant as Crassula Dudia and say it is the propeller plant. It is NOT CRASSULA DUDIA AND IT IS NOT THE PROPELLER PLANT!
Type in Crassula cotyledonis on your browser, click on Wikipedia. What is there? NOTHING! Even the Llifle website, which has information and photos on THOUSANDS of cactus and succulents says nothing about this plant.
THE TRUE PROPELLER PLANT, CRASSULA PERFOLIATA VAR. FALCATA: PLANTS OF THE WORLD ONLINE, DAVE’S GARDEN, and LLIFLE (even though they incorrectly say Crassula perfoliata var. minor is the accepted name-I think they made a mistake.),
Let me see if I can get this straight… Crassula cotyledonis Thunb. is the CORRECT AND ACCEPTED scientific name for INCORRECTLY marketed Crassula Dudia. It was first described as such by Carl Peter Thunberg in Nova Acta Physico, etc. in 1778. This plant was incorrectly labeled Crassula Dudia when I bought it, which I supposed should have been Crassula dubia (photos online matched). Crassula dubia was first described by Selmar Schönland in Botanische Jahrbücher für Systematik, etc. in 1910. A synonym of this plant is/was Crassula cephalophora var. dubia which was also described by Schönland in Transactions of the Royal Society of South Africa in 1929. SO, positively speaking the last infraspecific name is also a synonym of Crassula cotyledonis. OH, by the way, Crassula cephalophora is a synonym of Crassula nudicaulis.
Now, the plant I bought was incorrectly labeled Crassula Dudia and gives the common name Propeller Plant… No such plant whatsoever unless you find them online, which are ALL incorrectly sold under that name. The common name it had on the label is also the common name for the infraspecific species Crassula perfoliata var. falcata. Makes you wonder how many plants are sold with people thinking they have a Propeller Plant by the name of Crassula Dudia. Why can’t the industry do a little research and have labels printed with the correct name? How hard would it really be?
I had already decided that this plant was a Crassula dubia when I sent a photo to Margrit Bischofberger of the International Crassulaceae Network in 2013. Not only that, but I sent her photos of all my plants in the Crassulaceae family and she corrected many names. She told me this plant was Crassula cotyledonis. At that time, I barely knew about The Plant List, which was and still is, AWESOME. It is now unmaintained, though, and 2013 was the last update. It turned out we were both right, Crassula dubia being a synonym of Crassula cotyledonis. You don’t expect me to admit to being wrong.
After I bought this plant, I brought it home, took photos and measurements, and put it in a larger pot. It didn’t take long for this plant to transform. It did fine, and continued growing and doubled in size within 9 months.
I bought this plant with me when I moved back to the family farm in mid-Missouri in February 2013. It had to take a 8-9 hour ride in the back or a trailer and it was 30 degrees! I put most of my plants in the basement with poor light and 60-65 degree temperature. Some of the succulents didn’t seem to mind at all that and some of them, including my Crassula cotyledonis, soon started failing. It slowly but surely died. I will find another one someday.
If you have any comments, questions or suggestions, I would love to hear from you.