Ladies first: the female Welwitschia is above. The photo below is of the male Welwitschia.
A plant that is either male or female is dioecious. Holly and Asparagus are examples of plants that are also dioecious. Ginko is another--most commercially sold Ginko trees are male, because the fruit of the female Ginko has a foul odor.
Plant romance--in this case, of relative youngsters. The two examples above from the Huntington Desert Conservatory are babes. If you google up examples in situ from the Namibian desert, this plant forms a pile of linguini-like foliage as tall as a man's shoulder.
Then there is plant aging. Ferocactus schwartii starts life very spiny, and matures to a spineless, most elegant silhouette:
I've long admired this plant, but it was only on our last visit I noticed the tag said "from seed, 1970".
One idea from the recent Succulent symposium was expressed by Tony Avent: that we see plants at this moment in time--they are continuing to evolve to new forms. In our lifespan, we see only one single frame of an epic film.
We who love plants--isn't it lovely to know they are far more worthy of our love and admiration than we can ever imagine?