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Perideridia californica

Higher Taxonomy
Family: Apiaceae (Umbelliferae)View DescriptionDichotomous Key

Habit: Annual to perennial herb [shrub, tree], generally from taproot. Stem: generally +- scapose, generally ribbed, hollow. Leaf: basal and generally cauline, generally alternate; stipules generally 0; petiole base generally sheathing stem; blade generally much dissected, occasionally compound. Inflorescence: umbel or head, simple or compound, generally peduncled; bracts present in involucres or 0; bractlets generally present in "involucels". Flower: many, small, generally bisexual (or some staminate), generally radial (or outer bilateral); calyx 0 or lobes 5, small; petals 5, free, generally ovate or spoon-shaped, generally incurved at tips, generally +- ephemeral; stamens 5; pistil 1, ovary inferior, 2-chambered, generally with a +- conic, persistent projection or platform at tip subtending 2 free styles. Fruit: 2 dry, 1-seeded halves (= mericarps), separating from each other but generally +- persistent to central axis; ribs on halves 5, 2 marginal, 3 to back; oil tubes 1--several per interval between ribs.
Genera In Family: 300 genera, 3000 species: +- worldwide, especially temperate; many cultivated for food or spice (e.g., Carum, caraway; Daucus; Petroselinum); Bupleurum lancifolium Hornem. is historical garden weed; some toxic (e.g., Conium). Note: Mature fruit generally critical in identification, shape given in outline. Hydrocotyle moved to Araliaceae. Petroselinum crispum (Mill.) A.W. Hill is a waif.
eFlora Treatment Author: Lincoln Constance & Margriet Wetherwax, except as noted
Scientific Editor: Douglas H. Goldman, Bruce G. Baldwin.
Genus: PerideridiaView DescriptionDichotomous Key

Common Name: YAMPAH
Habit: Perennial herb, glabrous, generally glaucous; roots tuberous, single or clustered, or clustered-fibrous. Stem: erect, branched. Leaf: blade lanceolate to triangular-ovate, generally 1--2-ternate-pinnate or 1--2-pinnately or ternate-pinnately dissected, leaflets or segments generally linear to lance-linear. Inflorescence: umbels compound; bracts 0--many, conspicuous and reflexed or not; bractlets several to many, narrow, +- scarious; rays, pedicels few to many, generally spreading-ascending; 2° umbels generally convex distally. Flower: calyx lobes evident; petals generally obovate, white, tips narrowed. Fruit: linear-oblong, +- compressed side-to-side or not at all, glabrous; ribs +- equal, thread-like to prominent, not winged; oil tubes 1--several per rib-interval; fruit axis divided to base. Seed: face flat to grooved.
Species In Genus: +- 12 species: generally western America. Etymology: (Greek: around the neck, from involucre) Note: Roots, basal leaves needed for identification.

Perideridia californica (Torr.) A. Nelson & J.F. Macbr.
Habit: Plant 5--15 dm, generally branched; roots tuberous, 2--5-clustered, 5--12 cm, cylindric. Leaf: basal petiole 2--6 cm; basal blade 15--45 cm, +- ovate, 1--2-ternate-pinnately dissected, segments flattened, terminal 3--15 cm, lance-linear, entire, lateral 3--30 mm, 5--10 mm wide, ovate, flattened, pinnately lobed; cauline leaves reduced. Inflorescence: peduncle 2--20 cm: bracts 5--8, 2--5 mm, lance-ovate, scarious-margined, acuminate; bractlets 10--12, 1--4 mm, +- ovate, scarious-margined; rays generally 8--12, 3--8 cm, +- equal, spreading-ascending; pedicels 5--10 mm; 2° umbels 18--28-flowered. Flower: petals 1-veined; styles 1--1.5 mm. Fruit: 5--8 mm, +- oblong; ribs thread-like; oil tube 1 per rib-interval. Chromosomes: 2n=44.
Ecology: Damp soil by streams; Elevation: 300--1250 m. Bioregional Distribution: c SNF, SnFrB, SCoR. Flowering Time: Apr--May
eFlora Treatment Author: Lincoln Constance & Margriet Wetherwax
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Citation for this treatment: Lincoln Constance & Margriet Wetherwax 2016. Perideridia californica, in Jepson Flora Project (eds.) Jepson eFlora,, accessed on May 04, 2016.

Citation for the whole project: Jepson Flora Project (eds.) 2016. Jepson eFlora,, accessed on May 04, 2016.

Perideridia californica
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© 2009 Barry Breckling
Perideridia californica
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© 2008 Keir Morse
Perideridia californica
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© 2008 Keir Morse
Perideridia californica
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© 2009 Aaron Schusteff
Perideridia californica
click for enlargement
© 2008 Keir Morse
Perideridia californica
click for enlargement
© 2008 Keir Morse

More photos of Perideridia californica in CalPhotos

Geographic subdivisions for Perideridia californica:
c SNF, SnFrB, SCoR.
Markers link to CCH specimen records. If the markers are obscured, reload the page [or change window size and reload]. Yellow markers indicate records that may provide evidence for eFlora range revision or may have georeferencing or identification issues.
map of distribution 1
(Note: any qualifiers in the taxon distribution description, such as 'northern', 'southern', 'adjacent' etc., are not reflected in the map above, and in some cases indication of a taxon in a subdivision is based on a single collection or author-verified occurence).

View elevation by latitude chart
Data provided by the participants of the Consortium of California Herbaria.
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CCH collections by month

Duplicates counted once; synonyms included.
Species do not include records of infraspecific taxa.
Blue line denotes eFlora flowering time.