Perideridia bolanderi
Perideridia bolanderi subsp. involucrata
Bolander's Yampah, olasi
Bolander's Yampah
basal 2–4 pinnate;
petiole 2–15 cm;
blade deltate, ovate, or ovate-lanceolate, 10–20 cm, most primary leaflets dissected, ultimate divisions monomorphic or dimorphic (terminal more elongate than laterals), oblong to filiform, 5–60 mm (terminal sometimes to 80 mm), margins usually toothed or lobed;
cauline leaves usually 1-ternate or 1-ternate-pinnate.
ultimate divisions of basal leaves monomorphic, 6–60 × 0.3–0.7 mm.
2–20 cm.
involucral bracts 8–12, linear to narrowly lanceolate;
rays 9–23, 1–2 cm, subequal, ascending or spreading-ascending;
involucel bractlets 4–10, obovate or lanceolate to linear-lanceolate, 3–9 mm, widely scarious-margined or entirely scarious, apex acuminate;
umbellets convex, 18–30-flowered.
involucral bracts and involucel bractlets persistent, linear to linear-lanceolate, widely scarious-margined;
umbellets 18–25-flowered.
2–5 mm.
petals 1-veined;
styles 2 mm, spreading and usually recurved.
oblong;
mericarps 4–6 mm;
ribs threadlike;
oil ducts 2–3 in intervals, 4 on commissure.
= 38.
Perideridia bolanderi
Perideridia bolanderi subsp. involucrata
Subspecies 2 (2 in the flora).
Perideridia bolanderi is distinguishable from all other species in the genus by the following combination of characters: ultimate divisions of the basal leaves dimorphic, or if homomorphic, less than 1 mm wide; bracts and bractlets broad, conspicuously scarious, and cuspidate or acuminate, or if only broadly scarious-margined and acuminate, the bracts persistent at maturity; and mericarps oblong with 2–3 oil ducts in the intervals. Although the two subspecies share this combination of characters, phylogenetic analysis of DNA sequence data shows that they do not form a monophyletic group, though this separation is only weakly supported (S. R. Downie et al. 2004).
(Discussion copyrighted by Flora of North America; reprinted with permission.)
Subspecies involucrata is distinguished by its glaucous herbage, finely dissected leaves, and conspicuous and persistent involucral bracts. It is found in the Sierra Nevada foothills from Butte County to Calaveras County.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
1. Plants not glaucous; ultimate divisions of basal leaf blades 1–4 mm wide, dimorphic (terminal more elongate than laterals); involucral bracts and involucel bractlets entirely scarious, deciduous. | subsp. bolanderi |
1. Plants glaucous; ultimate divisions of basal leaf blades 0.3–0.7 mm wide, monomorphic; involucral bracts and involucel bractlets widely scarious-margined, persistent. | subsp. involucrata |
CA
OR
Flora NW
PNW Herbaria
WildflowerSearch
iNaturalist
USDA Plants Database
