From the relatively few conservatories I’ve visited, I have the impression that it is mandatory for every one of these institutions to have lollipop plant or golden shrimp plant on display.
Pachystachys (“thick spikes”) contains a dozen recognized species; Pachystachys lutea, Pachystachys coccinea, and Pachystachys spicata are the species most often encountered in cultivation. The genus is associated with the New World tropics (and with pollinating hummingbirds); Pachystachys lutea has a native range restricted to Peru.
In its native range and within conservatories, plants can be perennial and exceed 2m (6ft.) in height; height when grown as a summertime potted “annual” in temperate climates is much reduced–perhaps reaching a 0.5m (~18 in.). However, inflorescence size is little affected. Each inflorescence contains a number of white flowers emerging from behind one of the four rows of yellow bracts.
The University of Connecticut’s Biodiversity Education & Research Greenhouses page has additional photographs: Pachystachys lutea.