This section is from the book "An Illustrated Flora Of The Northern United States, Canada And The British Possessions Vol2", by Nathaniel Lord Britton, Addison Brown. Also available from Amazon: An Illustrated Flora of the Northern United States, Canada and the British Possessions. 3 Volume Set..
Clematis Scottii Porter, in Porter & Coulter, Fl. Colo. I.
1874. Clematis Douglasii var. Scottii Coulter, Man. Bot.
Rocky Mts. 3. 1885. V. Scottii Rydb. Fl. Colo. 141. 1906.
Somewhat villous when young, nearly glabrous when old, stems erect, simple, or nearly so, or branched from the base, 10'-2° tall. Leaves peti-oled, the upper pinnate or bipinnate, 3'-6' long, their segments lanceolate, oblong or ovate, entire or few-toothed, stalked, acuminate or acute at the apex, narrowed at the base, 6"-18" long; lower leaves sometimes entire, or pinnately cleft, smaller than the upper; flowers solitary, terminal or also axillary, long-peduncled, nodding, nearly 1' long, purple; sepals ovate-lanceolate, thick; persistent styles plumose throughout, 1' long or more, the plumes brown.
In dry soil, South Dakota to Nebraska, Colorado and Idaho. May-July.