Cirsium pastoris J.T. Howell
Cirsium occidentale (Nutt.) Jeps. var. candidissimum (Greene) J.F. Macbr.
Snowy thistle
[An article has not been written yet.]
Cirsium candidissimum (Greene) Davidson & Moxley
Cirsium pastoris J.T. Howell
Cirsium pastoris J.T. Howell
6/2/2009 · Zion National Park, Utah · ≈ 2 × 1½″ (5.8 × 4.1 cm) 
ID is uncertain 
6/2/2009 · Zion National Park, Utah · ≈ 2 × 2″ (5.5 × 5.3 cm) ID is uncertain 
| Kingdom | Plantae | Plants, but not fungi, lichens, or algae (from Stearn's Botanical Latin) |
| Subkingdom | Tracheobionta | Vascular plants—plants with a “circulatory system” for delivering water and nutrients |
| Division | Magnoliophyta | Flowering plants, also known as angiosperms |
| Class | Magnoliopsida | Dicotyledons—plants with two initial seed leaves |
| Subclass | Asteridae | A large class that encompasses asters |
| Order | Asterales | Flowering plants with a central disk flower and surrounding petals, like daisies |
| Family | Asteraceae | The aster family, which also includes daisies and sunflowers; from the Greek ἀστήρ, “star,” for the star-shaped flowers |
| Genus | Cirsium | From Greek kirsion, “a kind of thistle” |
| Species | occidentale | From the west, western |
| var. | candidissimum | Very white |
Cirsium occidentale var. candidissimum description by Thomas H. Kent, not updated.
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