Hamwild said: Do they consider Agaves monocarpic? I'm not sure I know what makes a plant monocarpic. I think I've heard Agaves are, but they also produce babies like Yuccas (my Yuccas die after they bloom, but they make tons of babies). 
I think people say Bromeliads and air plants are too (well, those are related), but they also produce babies before they die.
OK. A few things here. If your yuccas die after flowering, they are actually monocarpic. A lot of plants make terminal flowers (the growth center becomes an inflorescence) and then live on by generating a new growth center just below that point. Then there are plants whose main rosette does actually die, but new ones are generated at the base.
The term monocarpic starts to break down (or become less useful) in these cases. Clearly the surviving basal rosettes are clones of the mother plant (genetically identical) so in a sense she lives on, despite having died in another sense.
With the agaves this pattern is fairly common. There are lots of agaves which offset well before flowering (the clumpers). There are quite a few agaves which offset only or mostly after flowering. I am no kind of botanist but I would call all these plants monocarpic, maybe some with an asterisk.
Then there are agaves which do not follow either pattern, branching after they bloom from some point on the stem below the inflorescence but well above the base. Like stricta for example. I would call these plants polycarpic because the flowering event is just a pause before they sprout a new head (usually heads) and continue growing, much like the common Beaucarnea and (from what I can tell) some Yuccas. Flowering is just a trigger for branching, in a pretty straightforward sense.
Bromeliads make up a huge group and there is no one pattern explaining their reproductive behavior. There are clearly monocarpic plants (like many Puyas) and there are clearly polycarpic plants (like my Deuterocohnia and Dyckia), and probably some that are sort of in between in the same way as agaves. Plants with terminal inflorescences may be monocarpic but plants with lateral inflorescences are (always or almost always) polycarpic.
