Calochortus monophyllus is endemic to California. It is found in the foothill Interior oak woodland and yellow pine forest habitats of the Sierra Nevada and southernmost Cascades in California, from Shasta County to Tulare County.
Calochortus monophyllus is a perennial herb producing a slender, sometimes branched stem up to about 20 centimeters tall. The basal leaf is 10 to 30 centimeters in length and does not wither at flowering. There may be smaller leaves located along the stem.
The inflorescence bears 1 to 6 erect, bell-shaped flowers. Each flower has three pointed sepals and three more rounded petals, all bright to deep yellow. The petals may have some dark reddish spotting at the bases and are coated densely with yellow hairs on the inner surfaces.
- Kew World Checklist of Selected Plant Families
- Flora of North America, Calochortus monophyllus
- Lemaire, Antoine Charles 1849. Flore des Serres et des Jardins de l'Europe 5: 430b short description in Latin, longer description and commentary in French, line drawing of flower
- Lindley, John 1849. Journal of the Horticultural Society of London 4: 81, as Cyclobothra monophylla
- Tropicos, Calochortus monophyllus (Lindl.) Lem.
- Calflora taxon report, University of California @ Berkeley: Calochortus monophyllus (yellow star tulip)
- Media related to Calochortus monophyllus at Wikimedia Commons
- Data related to Calochortus monophyllus at Wikispecies
- Jepson Manual Treatment of Calochortus monophyllus'
- United States Department of Agriculture Plants Profile for Calochortus monophyllus (yellow star tulip)
- Calphotos Photos gallery, University of California @ Berkeley: Calochortus monophyllus'
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