Penstemon putus

Penstemon putus, also known as Black River penstemon, is a species in the veronica family which only grow in the state Arizona, primarily along the Mogollon Rim.

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The Black River penstemon is a herbaceous perennial plant that has a woody caudex, which can grow one to ten flowering stems. The flowering stems are hairless, not glaucous, and grow straight upwards from the base of the plant or lean outwards somewhat before growing upwards, usually to a length of 20 to 45 centimeters (8–18 in), but occasionally to as much as 60 cm (24 in). The leaves of the Black River penstemon are bright green, with smooth untoothed edges, and can grow directly from the caudex or be attached to the stems. Their texture can be leathery and they are linear, narrow like a grass blade, with the basal leaves and lowest ones on the stems measuring 1.5–12.5 centimeters (0.5–5 in) long and just 1–6 millimeters wide, often less than 4 mm. Each flowering stem will have five to seven pairs of leaves with the upper ones measuring 0.8–9.5 cm long and 0.5–4 mm wide and the base of the leaf directly attached by their bases to the main stem. The flowers range in color from white to pink, lavender, violet, or blue and are hairless externally and have white hairs on the lower side of the flower's interior. The flowers have red-purple floral guide lines and are 1.8–2.2 cm long overall. They are in five to eleven groups on the upper part of the flowering stem, each group having one or two points where they attach and one to three flowers for each point of attachment. All the flowers face in one direction away from the stem.