The study of plant life; e.g. angiosperms, gymnosperms, bryophytes, pteridophytes, and algae.

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What is the difference between drought resistant non-succulent plants and plants that cannot be allowed to dry out?

What features make one plant able to withstand dry spells better than another with relatively similar structure? For instance, one of my Rudbeckias is wilting from drought at the moment, and an ...