Pedicularis lanceolata
Pedicularis oederi
swamp lousewort
Oeder's lousewort
basal 0;
cauline 10–30, blade lanceolate, 20–100 x 10–30 mm, 1-pinnatifid, margins of adjacent lobes nonoverlapping, 2-serrate, surfaces hispid.
basal 2–10, blade lanceolate, 10–70 x 3–15 mm, 1-pinnatifid, margins of adjacent lobes nonoverlapping or extensively overlapping distally, 2-serrate, surfaces glabrous or slightly tomentose;
cauline 1–5, blade lanceolate, 15–50 x 3–20 mm, 1-pinnatifid, margins of adjacent lobes nonoverlapping or extensively overlapping distally, 1- or 2-serrate, surfaces glabrous or slightly tomentose.
paniculate, 1, each 10–20-flowered;
bracts lanceolate to trullate, 5–10 x 3–5 mm, undivided or 1-pinnatifid and 1- or 2-auricled, proximal margins entire, distal 1- or 2-serrate, surfaces glabrous or hispid.
simple, 1 or 2, exceeding basal leaves, each 10–50-flowered;
bracts linear to lanceolate, 5–20 x 1–2 mm, undivided or 1-pinnatifid, proximal margins entire, distal serrate, surfaces glabrous or tomentose.
1–1.5 mm.
2–5 mm.
calyx 7–12 mm, glabrous or hispid, lobes 2, trullate, ovate, elliptic, or triangular, 2.5–3.5 mm, apex serrate, glabrous, sometimes ciliate;
corolla 16–22 mm, tube white, cream, or light yellow, 8–12 mm;
galea white, cream, or light yellow, 8–12 mm, beaked, beak straight, 0.5–2.5 mm, margins entire medially and distally, apex extending over abaxial lip;
abaxial lip white, cream, or light yellow, 7–10 mm.
calyx 8–11 mm, tomentose, lobes 5, triangular, 1–3 mm, apex entire or serrate, glabrous, sometimes ciliate;
corolla 15–24 mm, tube yellow, 9–15 mm;
galea bicolored, yellow proximally, brown or red distally, 6–9 mm, beakless, margins entire medially and distally, apex arching slightly over abaxial lip;
abaxial lip yellow, 4–5 mm.
= 16.
= 16 (Asia).
Pedicularis lanceolata
Pedicularis oederi
The long corolla tubes of Pedicularis lanceolata are uncharacteristically nectarless, and only late season pollen-foraging worker bumblebees pollinate this species (L. W. Macior 1969). The uniquely hinged abaxial lip covering the opening of the galea is an adaptation to allow only worker bumblebees access to the anthers, as they must learn to push it aside during foraging.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
Pedicularis oederi is known from the mountains of Europe, Asia, and western North America.
Two arctic species can be easily confused with Pedicularis oederi. Pedicularis flammea also has bicolored flowers that are yellow with galeas that are red- or purple-tipped, but the flowers of P. oederi are twice the size of those of P. flammea. The flowers of P. capitata are sometimes also yellow but may or may not be bicolored. If bicolored, the color is more diffuse and lighter than that of either P. flammea or P. oederi. The flowers of P. capitata are also larger than those of P. oederi. In addition, the inflorescences of P. capitata usually have no more than five flowers clustered at the tips, while those of P. oederi have at least 10 to 50 flowers along at least one third their lengths. H. J. Scoggan (1978–1979) listed P. oederi var. albertae based upon its densely woolly inflorescence.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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