Castilleja xanthotricha


Notul. Nat. Acad. Nat. Sci. Philadelphia 74: 5. 1941.

Common names: John Day or yellow-hairy paintbrush
Treatment appears in FNA Volume 17. Treatment on page 665. Mentioned on page 573, 577.

Herbs, perennial, 1–2(–3.8) dm; from a woody caudex; with a taproot. Stems few to several, ± decumbent to erect or ascending, unbranched, sometimes with short, leafy axillary shoots, hairs erect to spreading, long, soft, eglandular, mixed with short stipitate-glandular ones. Leaves green, linear, lanceolate to broadly lanceolate, oblong, or cuneate, 0.8–5 cm, not fleshy, margins plane to wavy, involute, 0–5-lobed, apex acute, sometimes rounded; lobes spreading, linear, arising below mid length, nearly as broad as center lobe, apex acute. Inflorescences 3–14 × 1.5–4.5 cm; bracts proximally greenish, rarely dull reddish purple, distally white to cream, rarely pale yellow or dull, pale pink (sharply differentiated from proximal coloration), lanceolate or oblong to narrowly ovate, (3–)5–7-lobed; lobes ascending, linear to obovate, ± broadened distally, medium, long, proximal lobes arising below mid length, central lobe apex broadly rounded to truncate, others acute to rounded. Calyces colored as bracts, 15–26 mm; abaxial and adaxial clefts 3.5–7 mm, 25–50% of calyx length, deeper than laterals, lateral 2–5 mm, 12–25% of calyx length; lobes linear, oblong, or narrowly triangular, center lobe apex usually rounded, lobes acute to rounded. Corollas curved, 17–23 mm; tube 15–19 mm; beak exserted, adaxially green, 5–8(–9) mm, puberulent, stipitate-glandular; abaxial lip deep purple (color sometimes visible through calyx), green, pinkish, or pale yellow, ± prominent, slightly inflated, usually hidden in calyx, sometimes right at top of calyx, 2 mm, ca. 50% as long as beak; teeth ascending, whitish, yellowish, pink, or green, 1–1.5 mm. 2n = 48.

Phenology: Flowering Apr–Jul.
Habitat: Arid, rocky, sandy, or clay slopes of basaltic origin, sagebrush steppes.
Elevation: 400–800 m.


Castilleja xanthotricha is endemic to moderate elevations in the sagebrush hills of the John Day River drainage in north-central Oregon. N. H. Holmgren (1971) hypothesized that this tetraploid species is of allopolyploid hybrid origin between C. glandulifera and C. oresbia.

Selected References


Lower Taxa

... more about "Castilleja xanthotricha"
J. Mark Egger +, Peter F. Zika +, Barbara L. Wilson +, Richard E. Brainerd +  and Nick Otting +
Pennell +
John Day or yellow-hairy paintbrush +
400–800 m. +
Arid, rocky, sandy, or clay slopes of basaltic origin, sagebrush steppes. +
Flowering Apr–Jul. +
Notul. Nat. Acad. Nat. Sci. Philadelphia +
Euchroma +  and Oncorhynchus +
Castilleja xanthotricha +
Castilleja +
species +