Jepson eFlora: Taxon page
Key to families | Table of families and genera
Previous taxon Index to accepted names and synonyms:
| A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z |
Next taxon
Oxypolis occidentalis

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: OxypolisView Description 

Habit: Perennial herb, glabrous; tubers clustered. Stem: erect, generally branched. Leaf: blade oblong [linear, triangular-ovate], pinnate, [simple, ternate]; main axis segmented, hollow, occasionally bladeless. Inflorescence: umbels compound; involucre, involucel variable; bracts, bractlets 0 or 1--several, +- inconspicuous; rays, pedicels few to many, spreading-ascending. Flower: calyx lobes evident [minute] but not a persistent crown on fruit; petals wide, white, tips narrowed. Fruit: oblong to obovate, compressed front-to-back; ribs unequal, marginal widely thin-winged, wings veined on back at inner margin, others thread-like; oil tube 1 per rib-interval; fruit axis divided to base.
Species In Genus: +- 6 species: western and eastern United States, Caribbean. Etymology: (Greek: sharp white)

Oxypolis occidentalis J.M. Coult. & Rose
Habit: Plant 6--15 dm. Leaf: petiole 1--5 dm; blade 12--30 cm, oblong, 1-pinnate, leaflets 5--13, 3.5--9.5 cm, lanceolate to widely ovate, crenate to serrate or irregularly cut; cauline leaves with enlarged petiole, smaller leaflets than basal. Inflorescence: peduncle 6--30 cm; bracts 0--1(8), 5--20 mm, linear, scarious; bractlets like bracts, < 10 mm; rays 12--24, 2--8.5 cm; pedicels 3--15 mm. Flower: calyx lobes conspicuous. Fruit: 5--6 mm, oblong or ovate. Chromosomes: 2n=36.
Ecology: Bogs, wet meadows, stream sides, generally in conifer forest; Elevation: < 2700 m. Bioregional Distribution: CaRF, SN, SnGb, SnBr, W&I; Distribution Outside California: Oregon, British Columbia. Flowering Time: Jul--Aug
eFlora Treatment Author: Lincoln Constance & Margriet Wetherwax
Jepson Online Interchange

Previous taxon: Oxypolis
Next taxon: Pastinaca

Name Search
botanical illustration including Oxypolis occidentalis


Citation for this treatment: Lincoln Constance & Margriet Wetherwax 2016. Oxypolis occidentalis, in Jepson Flora Project (eds.) Jepson eFlora,, accessed on May 06, 2016.

Citation for the whole project: Jepson Flora Project (eds.) 2016. Jepson eFlora,, accessed on May 06, 2016.

Oxypolis occidentalis
click for enlargement
© 2010 Barry Breckling
Oxypolis occidentalis
click for enlargement
© 2010 Barry Breckling
Oxypolis occidentalis
click for enlargement
© 2010 Barry Breckling

More photos of Oxypolis occidentalis in CalPhotos

Geographic subdivisions for Oxypolis occidentalis:
CaRF, SN, SnGb, SnBr, W&I;
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.
View all CCH records

CCH collections by month

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