Patanjali talks about asanas in only 3 sutras: 46. A sitting posture should be steady and comfortable, 47. This is achieved through the relaxation of exertion, and making contact with the unlimited; 48. Then there is no further affliction from the dualities of existence.
Patanjali does not refer to specific postures or sequences of movements as we practice nowadays, he just speaks about a comfortable posture one should be able to maintain effortless for a prolonged time while undergoing meditation and concentration of the mind.