This section is from the book "Field Book Of Western Wild Flowers", by Margaret Armstrong. Also available from Amazon: Field Book Of Western Wild Flowers.
A handsome perennial, with leafy stems, from five to fifteen inches tall, bearing one or several, fine flowers at the top. They are an inch and a half long, with a bright blue corolla, dotted with green, with plaited folds and small teeth between the five lobes. This has been found in Yosemite, but is more common at Lake Tahoe. There are many other handsome large Blue Gentians in the West. G. lutea, with yellow flowers, is the German kind from which the well-known drug, gentian, is made.

Tall Centaury-Erythraea. exaltata.
 
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