Jepson eFlora: Taxon page
Vascular Plants of California
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Dendromecon rigida

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: DendromeconView DescriptionDichotomous Key

Common Name: TREE POPPY
Habit: Shrub to small tree, evergreen; sap colorless. Leaf: simple, entire or minutely toothed. Inflorescence: terminal, 1-flowered. Flower: receptacle funnel-shaped around ovary base; sepals 2, shed at flower; petals 4(6), free, 2--3 cm, obovate or wedge-shaped, yellow, satiny, shed after flower; stamens many, free; placentas 2, style 0, stigma lobes 2, flat. Fruit: linear, dehiscent from base. Seed: many, 2--3 mm, obovate, smooth, brown or black; fleshy appendage present.
Species In Genus: 2 species: California, Baja California. Etymology: (Greek: tree poppy)
Dendromecon rigida Benth.
Habit: Plant 1--3 m. Leaf: 2.5--10 cm, 0.7--2.5 cm wide. Flower: petals 2--3 cm. Fruit: 5--10 cm. Seed: 2--2.5 mm.
Ecology: Dry slopes, washes, especially recent burns; Elevation: < 1900 m. Bioregional Distribution: s NW, CaR, SN, CW (exc ChI), SW, w edge DSon; Distribution Outside California: northern Baja California. Flowering Time: Apr--Jun
Synonyms: Dendromecon herbacea Greene
Jepson eFlora Author: Gary L. Hannan & Curtis Clark
Index of California Plant Names (ICPN; linked via the Jepson Online Interchange)

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Botanical illustration including Dendromecon rigida

botanical illustration including Dendromecon rigida


Citation for this treatment: Gary L. Hannan & Curtis Clark 2012, Dendromecon rigida, in Jepson Flora Project (eds.) Jepson eFlora, /eflora/eflora_display.php?tid=22541, accessed on April 02, 2020.

Citation for the whole project: Jepson Flora Project (eds.) 2020, Jepson eFlora,, accessed on April 02, 2020.

Dendromecon rigida
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© 2009 Keir Morse
Dendromecon rigida
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© 2015 Barry Breckling
Dendromecon rigida
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© 2009 Keir Morse
Dendromecon rigida
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© 2008 Steve Matson
Dendromecon rigida
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© 2004 Christopher L. Christie
Dendromecon rigida
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© 2010 George W. Hartwell

More photos of Dendromecon rigida in CalPhotos

Geographic subdivisions for Dendromecon rigida:
s NW, CaR, SN, CW (exc ChI), SW, w edge DSon
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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).


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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).