group are pointed and narrow (lanceolate) 17–65 mm long and 3–17 mm wide. The short pedicels supporting each flower are also densely glandular and hairy as is the flowering stem (peduncles). The flowers of Penstemon albidus have sepals (calyx lobes) that are 4–7 mm long, 1.5–3 mm wide, pointed, and also covered in glandular hairs. The flower is white, occasionally tinged with a delicate shades of lavender, blue, or pink, possibly due to crossbreeding with other species. The flowers often have nectar guides extending from the mouth of the flowers down the lower interior of the flower tube toward the back that are red or magenta, often quite dark in contrast with the rest of the flower. The overall shape of the flower is a funnel 12–20 mm in length and 6–8 mm in diameter. The tube of the flower is not constricted at the opening and 4–6 mm long and 6–8 mm in diameter. Internally it is also glandular pubescent. In the sunlight the edges of its flowers will glisten slightly due the numerous hairs. P. albidus tends to have larger flowers in the north of its range than in the south of its range. The stamens are kept within the flower tube and have black flattened and spread out anther sacs. Each pollen sac is 0.1–1.1 mm in size and opens completely. The staminode is 8–9 mm long, but does not extend beyond the throat of the flower, and is sparsely to moderately covered in shaggy yellow hairs 1 mm long the end approaching the flower's mouth. The staminode can be either straight or recurved. The style is generally 9–11 mm in length, but occasionally is as long as 13 mm. Depending on altitude and weather conditions flowering will occur for 16 to 42 days starting in April to the end of July and rarely as late as September. The botanist Francis Pennell noted that the flowers are very fragrant at dusk when being visited by moths. The seed capsules are small drop shapes about 8–12 mm long and 4–7 mm in diameter. The seeds are black to dark brown in color and 2–3 mm in size. Taxonomy The type specimen of Penstemon albidus was collected in 1811 by Thomas Nuttall, "On the plains of the Missouri [River], common, from the confluence of the river Platte to the Mountains". It was described and named by him as Pentstemon