Agapanthus

I was being quizzed, or "pimped", as we like to say in the medical world, by this woman who was a hard-core Lily Tomlin/Susan Sontag blend. She was pimping me about plants, asking, rapid fire, "What's this?" "What's this?" "You can tell by the branch pattern!" as she frantically pointed at different plants and trees.

Dr. Cox appeared and astutely related that I knew the answers, but was overanalyzing and getting too nervous to answer correctly.

Lily/Susan showed me the next plant, and I got it right away. Agapanthus.