Oooops, don't know how that picture that my 3-year-old drew made its way in there 😕
Merlyn,
Differences in the leaflet size and overlap, angle of the leaflets radiating from the rachis, inflorescence size and number of orders, overall growth speed, and interfoliar vs. infrafoliar inflorescense. Yes, there is a chance the Floribunda ones could actually be C. blackii, but I don't want to make any definitive statements without more pictures and information. My belief is that C. blackii is actually fairly ubiquitous here in Florida and the true C. lanceolatus is quite rare.
Tim,
Yes, that is the article I used to make a 4-page comparison which I sent to Dr. Hodel and he confirmed that my first palm does key out to C. blackii. But, you are correct that environmental conditions and climate may create some differences in morphology, especially when juxtaposing CA vs. FL specimens. Based on my comparison, the palm in the first picture above aligns with Hodel's C. blackii (taking into consideration the climactic differences between Fountain Valley, CA and Fort Myers, FL) and the second one aligns with Dr. Baker's C. lanceolatus habitat photos.