Yellow Penstemon

The photo above shows yellow penstemon as seen at about 6145' along the Round the Mt. Trail #9 (to the east of Madcat Meadows) on the southern side of Mt. Adams.......................July 29, 2005. The similar yellow form of sulphur penstemon (Penstemon attenuatus) has many gland-tipped hairs within the inflorescence and conspicuously on the outer surfaces of the corolla.

1. So far this species has only been found on steep slopes along the Round the Mt. Trail between Salt Creek and Madcat meadows.

The photo above shows a close-up view of the calyx and corolla of yellow penstemon as seen at about 6145' along the Round the Mt. Trail #9 (to the east of Madcat Meadows) on the southern side of Mt. Adams.......................July 29, 2005. Note again how glabrous the calyx and corolla are.

The photo above shows a close-up view of the internal structures of yellow penstemon as seen at about 6145' along the Round the Mt. Trail #9 (to the east of Madcat Meadows) on the southern side of Mt. Adams.......................July 29, 2005. Note the characteristic purplish outer surface of the anther sacs which are non-haired and split fully, and which have the pairs largely opposite of each other. The tip of the staminode is slightly expanded 9somewhat visible here, and typically bears a tuft of hairs at the tip.

The photo above shows the form of a single stem of yellow penstemon as seen at about 6145' along the Round the Mt. Trail #9 (to the east of Madcat Meadows) on the southern side of Mt. Adams.......................July 29, 2005.

The two photosdirectly above show the glabrous stem leaves of yellow penstemon as seen at about 6145' along the Round the Mt. Trail #9 (to the east of Madcat Meadows) on the southern side of Mt. Adams.......................July 29, 2005.