Asparagaceae and Bromeliaceae
Cordyline australis vs Tillandsia fasciculata
These two are not on this page because a keyword tool suggested them. They are here because our own identification model genuinely mistook one for the other, on real photographs, 6 times. We publish the rate, and then we tell you what actually separates them.
Confused 6x by our model Method published
Side by sidefigs. a and b
Cordyline australis
New Zealand cabbage tree
Tillandsia fasciculata
cardinal airplant
How often our model gets it wrong measured, not estimated
| When the plant was | The model said | How often |
|---|---|---|
| Tillandsia fasciculata | Cordyline australis | 6 of 18 (33%) |
Measured on 38,299 openly licensed, research-grade photographs. Full method and dataset.
What actually separates themon the record
| Family | Asparagaceae versus Bromeliaceae. Different families, which is a real separation. |
|---|---|
| Genus | Cordyline versus Tillandsia. |
| Flowering | Peaks in November versus March. If the plant is in flower, timing helps. (n = 595 and 729.) |
What we do not have yet: the diagnostic morphological character that a botanist would key on, from a source we can cite. We are not going to invent one. Until we have it, this page tells you the two are genuinely confusable, how often, and what the taxonomy and the flowering data do and do not settle.