Perideridia bolanderi
Perideridia leptocarpa
Bolander's Yampah, olasi
narrow-seed 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.
basal 2-pinnate;
petiole 1–5 cm;
blade lanceolate-ovate, 10–15 cm, most primary leaflets dissected, ultimate divisions monomorphic, narrowly linear, 10–50 mm, margins entire;
cauline leaves 1–2-pinnate.
2–20 cm.
5–8 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.
strongly concave distally;
involucral bracts 0–2, bristle-shaped;
rays 12–18, 1–4(–4.5) cm, unequal in fruit, sometimes ± in flower, spreading-ascending or ascending;
involucel bractlets 6–8, linear-lanceolate, 1–4(–5) mm, scarious-margined;
umbellets convex, 20–30-flowered.
2–5 mm.
2–4 mm.
petals 1-veined;
styles 2 mm, spreading and usually recurved.
petals 1-veined;
styles 0.5–1.5 mm, spreading and usually recurved.
oblong;
mericarps 4–6 mm;
ribs threadlike;
oil ducts 2–3 in intervals, 4 on commissure.
linear-clavate;
mericarps 5–7 mm;
ribs threadlike;
oil ducts 1 in intervals, 2 on commissure.
= 34.
Perideridia bolanderi
Perideridia leptocarpa
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.)
Perideridia leptocarpa, known only from the Klamath Ranges in Siskiyou and Trinity counties, may not be distinct from P. oregana, although it is consistently separable by the combination of strikingly unequal rays and very narrow fruits. DNA sequence data show that some Siskiyou County collections assigned to P. leptocarpa by T. I. Chuang and L. Constance (1969) should be treated as P. oregana (S. R. Downie et al. 2004). The specific status of other collections assigned to this species, especially from Trinity County, should be examined by further molecular study, but it is likely that P. leptocarpa is best treated as a tetraploid race of P. oregana (Downie et al.).
(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
