Jepson eFlora: Taxon page
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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, CaRF, SNF, CW (exc ChI), SW; Distribution Outside California: northern Baja California. Flowering Time: Apr--Jun
Synonyms: Dendromecon herbacea Greene
eFlora Treatment Author: Gary L. Hannan & Curtis Clark
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botanical illustration including Dendromecon rigida


Citation for this treatment: Gary L. Hannan & Curtis Clark 2016. Dendromecon rigida, in Jepson Flora Project (eds.) Jepson eFlora,, accessed on April 29, 2016.

Citation for the whole project: Jepson Flora Project (eds.) 2016. Jepson eFlora,, accessed on April 29, 2016.

Dendromecon rigida
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© 2010 George W. Hartwell
Dendromecon rigida
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© 2008 Steve Matson
Dendromecon rigida
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© 2015 Julie Kierstead Nelson
Dendromecon rigida
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© 2015 Julie Kierstead Nelson
Dendromecon rigida
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© 2009 Barry Breckling
Dendromecon rigida
click for enlargement
© 2010 Barry Breckling

More photos of Dendromecon rigida in CalPhotos

Geographic subdivisions for Dendromecon rigida:
s NW, CaRF, SNF, CW (exc ChI), SW;
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.