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Cyclospermum leptophyllum

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: CyclospermumView Description 

Habit: Annual, taprooted, glabrous. Stem: decumbent to erect, generally loosely branched. Leaf: sessile or petioled; blade oblong to triangular-ovate, pinnately or ternate-pinnately dissected or compound, segments or leaflets generally thread-like to linear. Inflorescence: umbels compound or some simple; bracts, bractlets 0; rays few; rays, pedicels spreading. Flower: calyx lobes 0; petals oblong, white, tips not incurved. Fruit: elliptic to narrowly ovate, compressed side-to-side, glabrous [hairy]; ribs +- equal, thread-like to prominent and corky; oil tube 1 per rib-interval; fruit axis shallowly notched. Seed: face flat.
Species In Genus: 3 species: South America, 1 +- worldwide aggressive weed. Etymology: (Greek: circular seed) Note: "Ciclospermum" in TJM (1993).

Cyclospermum leptophyllum (Pers.) Britton & P. Wilson
Habit: Plant 0.5--6 dm. Leaf: 3.5--10 cm; petiole 2.5--12 mm, generally 0 on cauline leaves, sheath margin scarious; segments 3--15 mm, thread-like to linear, entire. Inflorescence: < 2 cm, generally some sessile; rays 1--3; pedicels 6--20, 2--16 mm, spreading. Fruit: 1.2--3 mm wide, elliptic to ovate. Chromosomes: 2n=14.
Ecology: Roadsides; Elevation: < 350 m. Bioregional Distribution: NCoRO, GV, c CCo, SnFrB, SCoRO, SCo; Distribution Outside California: +- worldwide, warm temperate. Flowering Time: Apr--Aug
Unabridged Note: Expanded author citation: Cyclospermum leptophyllum (Pers.) Sprague ex Britton & P. Wilson
eFlora Treatment Author: Lincoln Constance & Margriet Wetherwax
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botanical illustration including Cyclospermum leptophyllum


Citation for this treatment: Lincoln Constance & Margriet Wetherwax 2016. Cyclospermum leptophyllum, in Jepson Flora Project (eds.) Jepson eFlora,, accessed on February 13, 2016.

Citation for the whole project: Jepson Flora Project (eds.) 2016. Jepson eFlora,, accessed on February 13, 2016.

Cyclospermum leptophyllum
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© 2011 Steve Matson
Cyclospermum leptophyllum
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© 2014 Keir Morse
Cyclospermum leptophyllum
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© 2014 Neal Kramer
Cyclospermum leptophyllum
click for enlargement
© 2011 Steve Matson
Cyclospermum leptophyllum
click for enlargement
© 2011 Steve Matson
Cyclospermum leptophyllum
click for enlargement
© 2014 Keir Morse

More photos of Cyclospermum leptophyllum in CalPhotos

Geographic subdivisions for Cyclospermum leptophyllum:
NCoRO, GV, c CCo, SnFrB, SCoRO, SCo;
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).

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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.