Cortaderia selloana 'Pumila' is known as which of the following?

Cortaderia selloana 'Pumila' is correctly identified as Dwarf Pampas Grass. This particular cultivar of pampas grass is appreciated for its compact size compared to the standard pampas grass, making it a more manageable option for gardeners looking for ornamental grasses.

Dwarf Pampas Grass features the same striking feathery flower plumes typical of the species, but its reduced height allows it to fit well into smaller gardens or landscapes where space is limited. The aesthetic characteristics of Cortaderia selloana, including its graceful appearance and ability to provide texture and movement in the landscape, are retained in the 'Pumila' variety, making it popular among horticulturists.

In contrast, the other options refer to entirely different plant species. Golden Variegated Sweet Flag is known for its striking golden-striped foliage and aquatic adaptations, Lungwort is a flowering perennial recognized for its attractive foliage and early spring blooms, while Perennial Sage is a herbaceous plant valued for its culinary uses and attractive flowers. Each of these has distinct characteristics that set them apart from Dwarf Pampas Grass, confirming why the identification of Cortaderia selloana 'Pumila' as Dwarf Pampas Grass is appropriate.