Step 1: Concept Overview:
Androgenesis involves the development of a haploid plant from the male gametophyte (microspore/pollen). The question seeks the plant species where this was initially achieved via anther culture.
Step 2: In-Depth Explanation:
Sipra Guha and Satish C. Maheshwari, two Indian scientists, achieved a significant breakthrough in 1964 by producing haploid plants through anther culture. Their experiments focused on {Datura innoxia} (thorn apple). They successfully cultured excised anthers, observing embryo development directly from the microspores. This paved the way for haploid breeding in numerous other crop species.
Step 3: Conclusion:
The first androgenic haploid plants originated from Datura.