Penstemon nudiflorus

Penstemon nudiflorus, the Flagstaff penstemon, is a rare species in the veronica family from the Mogollon Rim in northern Arizona.

Wikipedia-Autoren · CC BY-SA · Quelle

Flagstaff penstemons are herbaceous plants with flowering stems that grow straigth upwards, typically to a height of 55 to 100 centimeters (21.5–39.5 in), but occasionally are just 35 cm (14 in). Plants can have both basal leaves and leaves attached to the stems, but in some cases the basal leaves are small or entirely missing. They are leathery in texture and hairless with a blue-white waxy coating. The lowest stem leaves and the basal leaves measure 2.5–11 centimeters (1–4.5 in) with a typical width of 1–2.7 cm (0.5–1 in), but sometimes as narrow as 4 millimeters. The stems have three to six pairs of leaves, the upper ones measuring 0.5–10.5 cm long and 0.1–3 cm wide. Blooming is in May and June. The flowers are funnel shaped and lavender to orchid in color, with red-purple floral guide lines. They measure 2–3.3 cm (1–1.5 in) long and only have sparse white hairs on the lower surface inside the flower tube. They are in 5 to 13 groups each with one or two points of attachment that branch to support two or sometimes three flowers. The fruit is a capsule 8–10 mm long and 3–4 mm wide.