Narrow-Leaved Skullcap
Scutellaria angustifolia Pursh

Collected near Kamiah in Idaho Co., Idaho, on 5 Jun 1806. (Source)

Deep blue violet flowers 20 to 32 mm long, 10 to 31 cm tall creeping by slender rhizomes, blooms May-June in open places.  Stems and leaves have upward curving hairs, often gland tipped.  Lanceolate to ovate leaves 10 to 20 mm long, weakly crenate with three or five veins from the base, borne on petioles 5 to 30 mm long.  Rather invasive and aggressively spreading by underground roots.  It blossoms in June. Flowers auxiliary, borne on pedicels 5 to 6 mm long.  Seeds black, varicose and lightly banded, if at all.  Found in Washington, western Idaho, Oregon and California.

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