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Chamaecyparis lawsoniana

Higher Taxonomy
Family: CupressaceaeView DescriptionDichotomous Key

Habit: Shrub, tree, generally evergreen; monoecious or dioecious. Leaf: simple, cauline, alternate or opposite (either +- 4-ranked) or whorled in 3s (6-ranked), linear or scale-, awl- or needle-like (sometimes linear and awl-like on 1 pl, or on juvenile or injured plants), generally decurrent, covering young stems. Pollen Cone: axillary or terminal. Seed Cone: +- fleshy to generally woody, generally hard at maturity; scales opposite or whorled, peltate or not. Seed: 1--many per scale, angled or lateral winged, generally wind-dispersed. Chromosomes: n=11.
Genera In Family: 30 genera, 130+ species: +- worldwide, especially North America, Eurasia. Note: Incl (paraphyletic) Taxodiaceae. Taxa of (polyphyletic) Cupressus in TJM (1993) now in Callitropsis, Chamaecyparis, Hesperocyparis.
eFlora Treatment Author: Jim A. Bartel, except as noted
Scientific Editor: Thomas J. Rosatti.
Genus: ChamaecyparisView Description 

Habit: Single-trunked tree, pyramidal in youth; monoecious. Stem: young shoots flat, in drooping or pendent clusters, in 1 plane. Leaf: opposite, 4-ranked, scale-like, overlapping, of 2 kinds (facials smaller, appressed, laterals with tips spreading above facials). Pollen Cone: terminal. Seed Cone: 5--14 mm, woody, +- spheric to widely cylindric, maturing 1st year, open at maturity; scales 8--12, peltate, abutting, shield- or wedge-shaped, projection generally present, <= 1 mm, pointed, base depressed from edge. Seed: (1)2--5(7) per scale, flat, wings 2, narrow; cotyledons 2. Chromosomes: n=11.
Species In Genus: 5 species: western and eastern North America, eastern Asia. Etymology: (Greek: dwarf or on-the-ground cypress)

Chamaecyparis lawsoniana (A. Murray bis) Parl.
Habit: Tree 20--65 m. Stem: trunk < 6 m diam; bark 15--25 cm thick, red-brown to tan, fibrous, fire-resistant; young shoots flat, in flat clusters, held +- horizontally, lower surfaces often paler. Leaf: green, generally glaucous; glands generally visible; lateral leaf tips generally curved toward stem axis. Pollen Cone: yellow-green, becoming dark red to purple black. Seed Cone: 6--11 mm, spheric, red-brown; scales 7--10, projection +- 0. Seed: 2--5 per scale, 2--4 mm, generally with wart-like pitch pockets, light chestnut-brown, generally glandular.
Ecology: Coastal conifer, mixed-evergreen, yellow-pine forests, often on serpentine; Elevation: < 1700 m. Bioregional Distribution: KR; Distribution Outside California: southwestern Oregon.
Synonyms: Cupressus lawsoniana A. Murray bis
eFlora Treatment Author: Jim A. Bartel
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botanical illustration including Chamaecyparis lawsoniana


Citation for this treatment: Jim A. Bartel 2016. Chamaecyparis lawsoniana, 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.

Chamaecyparis lawsoniana
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© 2014 Julie Kierstead Nelson
Chamaecyparis lawsoniana
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© 2008 Keir Morse
Chamaecyparis lawsoniana
click for enlargement
© 2014 Julie Kierstead Nelson
Chamaecyparis lawsoniana
click for enlargement
© 2000 John Game
Chamaecyparis lawsoniana
click for enlargement
© 2008 Keir Morse
Chamaecyparis lawsoniana
click for enlargement
© 2008 Keir Morse

More photos of Chamaecyparis lawsoniana in CalPhotos

Geographic subdivisions for Chamaecyparis lawsoniana:
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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Duplicates counted once; synonyms included.
Species do not include records of infraspecific taxa.
Blue line denotes eFlora flowering time.