Jepson eFlora: Taxon page
Vascular Plants of California
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Hesperomecon linearis

Higher Taxonomy
Family: PapaveraceaeView DescriptionDichotomous Key
Habit: Annual to small tree; sap colorless, yellow, orange, red, or white. Leaf: basal, cauline, or both, simple and entire, toothed, or lobed, or 1--3-pinnate-dissected or compound; cauline generally alternate; stipules 0. Inflorescence: terminal, 1-flowered or cyme, raceme, or panicle; bracts generally present. Flower: bisexual, radial, bilateral, or biradial; sepals 2--3, shed after flower; petals generally 2 × sepals in number; stamens generally many; ovary 1, superior, chamber 1, style 0 or 1, stigmas or lobes 2--many, ovules few to many. Fruit: capsule, dehiscent by valves or pores, +- nut, or breaking transversely into 1-seeded, indehiscent units. Seed: fleshy appendage generally 0.
Genera In Family: 25--30 genera, 200 species: northern temperate, northern tropics; some cultivated (Papaver, Eschscholzia, Hunnemannia), source of opiates. Note: Stylomecon moved to Papaver. Corydalis, Dicentra, Fumaria in Fumariaceae in FNANM, elsewhere. Glaucium flavum Crantz is a waif. According to FNANM (3:300--301), Hunnemannia fumariifolia Sweet (+- like Eschscholzia except sepals free) an occasional waif in California, but documentation evidently lacking. Fleshy appendage of seed sometimes for dispersal by ants.
eFlora Treatment Author: Gary L. Hannan & Curtis Clark, except as noted
Scientific Editor: Thomas J. Rosatti.
Genus: HesperomeconView Description 

Etymology: (Greek: hesper: evening or west; mecon: poppy)
eFlora Treatment Author: Gary L. Hannan
Hesperomecon linearis (Benth.) Greene
Habit: Annual, 3--40 cm, spreading-hairy. Leaf: basal or +- so, 5--85 mm, linear. Inflorescence: terminal, 1-flowered; peduncle 2.5--38 cm, > leaves, spreading-hairy. Flower: buds nodding; petals 3--20 mm, 2--10 mm wide, ovate to obovate, cream, base yellow or not, or outer 3 yellow, inner 3 cream; stamens many. Fruit: 10--15 mm, ovate. Seed: 0.4 mm, reniform-obovate.
Ecology: Grassy areas, washes; Elevation: < 1000 m. Bioregional Distribution: c&s SNF, Teh, SnJV, CW; Distribution Outside California: southern Oregon. Flowering Time: Mar--Jun
Synonyms: Meconella linearis (Benth.) A. Nelson & J.F. Macbr.; Hesperomecon filiformis Fedde; Platystigma linearis Benth.
Jepson eFlora Author: Gary L. Hannan
Index of California Plant Names (ICPN; linked via the Jepson Online Interchange)

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Botanical illustration including Hesperomecon linearis

botanical illustration including Hesperomecon linearis

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Citation for this treatment: Gary L. Hannan 2012, Hesperomecon linearis, in Jepson Flora Project (eds.) Jepson eFlora,, accessed on April 17, 2024.

Citation for the whole project: Jepson Flora Project (eds.) 2024, Jepson eFlora,, accessed on April 17, 2024.

Hesperomecon linearis
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©2013 Aaron Schusteff
Hesperomecon linearis
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©2005 Christopher L. Christie
Hesperomecon linearis
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©1999 Christopher L. Christie
Hesperomecon linearis
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©2022 California Academy of Sciences
Hesperomecon linearis
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©2013 Aaron Schusteff

More photos of Hesperomecon linearis
in CalPhotos

Geographic subdivisions for Hesperomecon linearis:
c&s SNF, Teh, SnJV, CW
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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).


Data provided by the participants of the  Consortium of California Herbaria.
View all CCH records
All markers link to CCH specimen records. The original determination is shown in the popup window.
Blue markers indicate specimens that map to one of the expected Jepson geographic subdivisions (see left map). Purple markers indicate specimens collected from a garden, greenhouse, or other non-wild location.
Yellow markers indicate records that may provide evidence for eFlora range revision or may have georeferencing or identification issues.

CCH collections by month

Duplicates counted once; synonyms included.
Species do not include records of infraspecific taxa, if there are more than 1 infraspecific taxon in CA.
Blue line denotes eFlora flowering time (fruiting time in some monocot genera).