Kellogg ex S. Watson (1882)
C. fasciculatum has two plicate leaves that are usually near the ground, but can by elevated up to 15 cm in some individuals. Up to four flowers hang from a drooping stem; sometimes resting on the leaves or even on the ground. The petals and sepals are green to purplish-brown while the pouch is yellowish-green with purple streaking near the opening.
C. fasciculatum is found in the western United States in Washington, Oregon, California, Colorado, Montana, Idaho, Utah, and Wyoming. It is usually found in cool, open coniferous forests, mostly in the mountains.
- Phillip Cribb & Peter Green (1997). The Genus Cypripedium (a botanical monograph). Kew Royal Botanic Gardens, Timber Press ISBN 978-0-88192-403-9
- Media related to Clustered Lady's Slipper (Cypripedium fasciculatum) at Wikimedia Commons
- Data related to Clustered Lady's Slipper (Cypripedium fasciculatum) at Wikispecies
- Range Map: NRCS: USDA Plants Profile Cypripedium fasciculatum, UT: , CO: , CA: 
- Jepson Manual Treatment of Cypripedium fasciculatum