Bonap shows C. benghalensis, C. coelestis and C. erecta.
http://bonap.net/NAPA/TaxonMap...
I am leaning toward C. benghalensis. Leaf sheaths on C. erecta are supposed to have auricles. Here is a photo of my C. erecta showing the auricles.
C. communis is not show to grow anywhere near Southern California. But to positively rule it out, check the spathe. C. communis will be seperated along the entire length, from the peduncle to the tip. C. benghalensis and C. erecta will be joined from the peduncle to about 1/3 the way to the tip. Like this photo of my C. erecta.
