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Lomatium macrocarpum

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: LomatiumView DescriptionDichotomous Key

Habit: Perennial herb, from taproot or generally deep-seated tuber, glabrous to tomentose. Stem: 0 or erect, simple or branched; base fibrous or not. Leaf: blade oblong to triangular-ovate or obovate, ternately, pinnately, or ternate-pinnately dissected or compound, segments or leaflets thread-like to wide; old basal leaf sheaths fibrous-persistent or not. Inflorescence: umbels compound, peduncled; bracts generally 0; bractlets generally present, 0 to conspicuous; rays, pedicels spreading to erect, generally webbed at base. Flower: calyx lobes generally 0; petals wide, yellow, white, or purple, tips narrowed; ovary tip projection 0. Fruit: linear to obovate, compressed front-to-back; marginal ribs widely to narrowly thin or thick-winged, others thread-like; oil tubes 1--several per rib-interval; fruit axis divided to base. Seed: face flat to concave.
Species In Genus: +- 75 species: central and southern North America. Etymology: (Greek: bordered, from prominent marginal fruit wing) Note: Fruit wing width given as width of 1 wing, not both together. Lomatium roseanum Cronquist is reported from CaRH, northern SNH, MP.

Lomatium macrocarpum (Torr. & A. Gray) J.M. Coult. & Rose
Habit: Plant 1--5 dm; taproot or occasionally tubers slender or basally swollen; herbage gray, generally tomentose to densely short-hairy. Stem: short; base not fibrous. Leaf: petiole 1.5--7 cm; blade 2.5--15 cm, oblong to obovate, pinnately or ternate-pinnately dissected, segments 1--7 mm, linear to oblong, entire; cauline leaves like basal. Inflorescence: generally tomentose; peduncle 0.5--3 dm; involucel 1-sided; bractlets several, >= flowers, lance-linear to ovate, acute, +- fused, reflexing, not scarious; rays 5--25, 1--8.5 cm, spreading-ascending; pedicels 1--14 mm. Flower: corolla white, cream, or +- purple; ovary generally hairy. Fruit: 9--20 mm, lanceolate or oblong to narrowly elliptic, minutely hairy to +- glabrous; wings generally < body in width; oil tubes 1--3 per rib-interval. Chromosomes: 2n=22.
Ecology: Generally serpentine rocky slopes in chaparral or woodland; Elevation: 150--3000 m. Bioregional Distribution: NCo, KR, CaR, SNF, Teh, SnFrB, SCo; Distribution Outside California: to British Columbia, central Canada, North Dakota, Utah. Flowering Time: Apr--Jun
eFlora Treatment Author: Lincoln Constance & Margriet Wetherwax
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Citation for this treatment: Lincoln Constance & Margriet Wetherwax 2017. Lomatium macrocarpum, in Jepson Flora Project (eds.) Jepson eFlora,, accessed on October 19, 2017.

Citation for the whole project: Jepson Flora Project (eds.) 2017. Jepson eFlora,, accessed on October 19, 2017.

Lomatium macrocarpum
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© 2011 Steve Matson
Lomatium macrocarpum
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© 2008 Keir Morse
Lomatium macrocarpum
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© 2012 Gary A. Monroe
Lomatium macrocarpum
click for enlargement
© 2008 Steve Matson
Lomatium macrocarpum
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© 2016 Keir Morse
Lomatium macrocarpum
click for enlargement
© 2008 Keir Morse

More photos of Lomatium macrocarpum in CalPhotos

Geographic subdivisions for Lomatium macrocarpum:
NCo, KR, CaR, SNF, Teh, SnFrB, SCo;
Markers link to CCH specimen records. Yellow markers indicate records that may provide evidence for eFlora range revision or may have georeferencing or identification issues. Purple markers indicate specimens collected from a garden, greenhouse, or other non-wild location.
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.