The flowers of Kniphofia triangularis subsp. triangularis grow in a short, dense raceme at the top of a sturdy, cylindrical peduncle. The thin, membranous bracts are narrow and pointed, longer than the short pedicels of the flowers.
Flowers hang from the bud stage, the inflorescence cone-shaped at its top. The inflorescence is up to 8 cm long and 5 cm wide. The tubular flower is cylindrical, ending in short tepal lobes with rounded tips that spread. The buds and flowers are yellow-orange to reddish, unicoloured throughout, although sometimes turning yellower from red as they mature. Perianths are from 24 mm to 35 mm long.
The stamens with dark anthers usually protrude from young flowers, retracted later. Exserted anthers are not seen in the photo where the white style with knobbly stigma is mostly longer than the stamens.
Flowering happens from before midsummer to after midautumn.
The triangularis name is derived from the shape of the three-sided fruit capsule (Manning, 2009; Pooley, 1998; iNaturalist).