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Ammoselinum giganteum

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: AmmoselinumView Description 

Habit: Annual, taprooted. Stem: erect or generally loosely branched, glabrous or roughened. Leaf: petiole entirely sheathing; blade oblong to obovate, ternately or ternate-pinnately dissected, segments linear to spoon-shaped. Inflorescence: umbels compound, peduncled or occasionally sessile, puberulent; bracts generally 0; bractlets several, narrow; rays, pedicels few, spreading or spreading-ascending, unequal. Flower: calyx 0; petals ovate, white, tips obtuse, not narrowed, not incurved. Fruit: oblong-ovate, compressed side-to-side; ribs +- equal, prominent, conspicuously bristly or sharply scabrous; oil tubes 1--3 per rib-interval; fruit axis notched at tip. Seed: face flat to concave.
Species In Genus: 4 species: 3 North America, 1 South America. Etymology: (Greek: sand-parsley)

Ammoselinum giganteum J.M. Coult. & Rose
Habit: Plant 1--2 dm. Leaf: petiole 3--8 mm; blade 1.5--2.5 cm, obovate, segments 4--13 mm, linear, glabrous or roughened. Inflorescence: peduncles 0--4 cm; rays 4--8, 0--2 cm; pedicels 1--10, 0--8 mm. Fruit: 3--5 mm, oblong-ovate; ribs corky, sharply scabrous. Chromosomes: 2n=38.
Ecology: Heavy soil under shrubs; Elevation: 152 m. Bioregional Distribution: DSon (Hayfield Lake, Riverside Co., 1922); Distribution Outside California: Arizona, northern Mexico. Flowering Time: Mar--Apr Note: Possibly introduced in California.
eFlora Treatment Author: Lincoln Constance & Margriet Wetherwax
Jepson Online Interchange
Listed on CNPS Rare Plant Inventory

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botanical illustration including Ammoselinum giganteum


Citation for this treatment: Lincoln Constance & Margriet Wetherwax 2016. Ammoselinum giganteum, 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.

Ammoselinum giganteum
click for enlargement
© 2011 Steve Matson
Ammoselinum giganteum
click for enlargement
© 2011 Steve Matson
Ammoselinum giganteum
click for enlargement
© 2011 Steve Matson
Ammoselinum giganteum
click for enlargement
© 2011 Steve Matson
Ammoselinum giganteum
click for enlargement
© 2011 Steve Matson

More photos of Ammoselinum giganteum in CalPhotos

Geographic subdivisions for Ammoselinum giganteum:
DSon (Hayfield Lake, Riverside Co., 1922);
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.