Please identify 3 Mystery Plants in Los Angeles

[yehoshua18]

These 3 plants are flowering now in the Mildred Mathias Botanical Garden on the UCLA campus.
Please help identify if you can. Thanks!

 

[cpp gardener]

They’re all bromeliads of one kind or another. Pictures with the entire plant would clarify things a bit, but there’s enough for the family I’d. I work with someone who used to work at UCLA and I’ll ask him to take a look. Maybe an answer next week.

 

[oneeye]

I think the others may be Hesperaloe parviflora, also known as red yucca,

 

[cpp gardener]

Well my friend didn’t know what they are but, a newspaper columnist went to the gardens and was also impressed with the bromeliad display. Now we know what at least 2 of them are:
Quesnelia testudo - Turtlehead bromeliad
Puya spathacea

I’m pretty sure the third one is a species of Dyckia but exactly which one I don’t know. All of them are hardy enough to grow outside in SoCal.