Appearance
''C. septentrionalis'' is a perennial herb with small narrow leaves, growing typically in small dense colonies. Like many other ''Castilleja'' species, it gets some of its nutrients from parasitizing the roots of other plants.Shoots are typically unbranched, becoming hairy only on their upper portions, with alternate simple leaves that are sessile The crowded flower clusters appear at the end of stems
Each flower cluster consists of tubular greenish-white flowers surrounded by cream-colored or purple-tinged bracts.
Distribution
Its distribution extends from Labrador and Newfoundland to Alberta, at the northern edge of its range, and from Maine as far west as Utah. In New Hampshire, it is an alpine obligate, typically found in patch communities associated with heavy late-melting snow, which provides not only moisture but also protection from weather. It is found only in northern regions or at high elevations; the species name "septentrionalis" means "northern."New Hampshire, Vermont, and Michigan designate ''C. septentrionalis'' as "Threatened"; Maine labels it "Special Concern"; Minnesota considers it "Endangered". It is not listed as a threatened species at the federal level.
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