Q.Crape Myrtle Variety
What cm variety has stems that grow separately and straight up like in photo?
Certified GKH Gardening Expert
They come in vase shaped, rounded, upright, arching, and mounding. The one pictured is likely a vase shaped or upright variety of medium height, so you can ask at the local nursery for those. Some examples are: "Commanche with coral pink blooms, 'Dynamite' with red blooms, 'Near East' with pink blooms and a vase shape, and 'Pink Velour', which is upright to vase shaped.
The pruning has a lot to do with it, too.
These articles should help:
https://crapemyrtletrails.org/varieties/complete-list-crape-myrtle/
https://crapemyrtletrails.org/varieties/complete-list-crape-myrtle/
https://www.gardeningknowhow.com/ornamental/trees/crepe-myrtle/pruning-crepe-myrtle-trees.htm