Flora of North America species comparison

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Perideridia bolanderi

Bolander's Yampah, olasi
Habit Herbs 15–90 cm; roots tuberous, 1 or 2–3-clustered, 1–7 cm.
Leaves

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.
Peduncles

2–20 cm.
Umbels

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.
Pedicels

2–5 mm.
Flowers

petals 1-veined;

styles 2 mm, spreading and usually recurved.
Schizocarps

oblong;

mericarps 4–6 mm;

ribs threadlike;

oil ducts 2–3 in intervals, 4 on commissure.

Perideridia bolanderi
Distribution
from USDA
w United States
[WildflowerSearch map]
[BONAP county map]
Discussion

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.)
Key
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
Source FNA vol. 13.
Parent taxa Apiaceae > Perideridia
Sibling taxa
P. americana, P. bacigalupii, P. californica, P. erythrorhiza, P. gairdneri, P. howellii, P. kelloggii, P. lemmonii, P. leptocarpa, P. montana, P. oregana, P. parishii, P. pringlei
Subordinate taxa
P. bolanderi subsp. bolanderi, P. bolanderi subsp. involucrata
Synonyms Podosciadium bolanderi
Name authority (A. Gray) A. Nelson & J. F. Macbride: Bot. Gaz. 61: 33. (1916)
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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