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Hesperocyparis macnabiana

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: HesperocyparisView DescriptionDichotomous Key

Habit: Large shrub, 1- or multi-trunked tree, often pyramidal in youth; monoecious. Stem: young shoots or branches generally cylindric (sometimes +- 4-angled or flat), generally in 3-dimensional clusters. Leaf: opposite, 4-ranked, of 1 kind, scale-like, closely appressed, overlapping. Pollen Cone: terminal, 2--6.5 mm, 1.3--3 mm diam, generally yellow. Seed Cone: 10--50 mm, woody, +- spheric to widely cylindric, maturing 2nd year, generally closed and attached beyond maturity (> 2 years); scales (4)6--12, peltate, abutting, shield- or wedge-shaped, projection generally > 1 mm especially 1st year, pointed, base level with or rising from edge. Seed: 60--150 per cone, flat, wings generally 2, vestigial; cotyledons generally 3--5. Chromosomes: 2n=22(23,24).
Species In Genus: 16 species: western and central North America, Central America. Etymology: (Greek: western cypress)

Hesperocyparis macnabiana (A. Murray bis) Bartel
Habit: Large shrub 3--10 m (multi-trunked tree 10--18 m). Stem: bark fibrous, gray-brown; ultimate branches 0.8--1.1 mm diam, +- 4-sided, ultimate 2 orders of shoots in 1 plane. Leaf: blue- to dull gray-green to gray; resin copious, sticky when fresh. Pollen Cone: 2--3 mm, 2 mm diam; scales generally 8; pollen sacs 3--5 per scale. Seed Cone: 15--21(25) mm, generally longer than wide, gray to red-brown; scales generally 6, projection conic, pointing upward to incurved. Seed: 3--5 mm, +- glaucous, dull brown; attachment scar conspicuous.
Ecology: Dry slopes, flats, chaparral, pine/oak woodland, often on serpentine; Elevation: 300--1460 m. Bioregional Distribution: NCoR, CaRF, n SNF; Distribution Outside California: reported from southwestern Oregon.
Synonyms: Callitropsis macnabiana (A. Murray bis) D.P. Little; Cupressus macnabiana A. Murray bis
eFlora Treatment Author: Jim A. Bartel
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botanical illustration including Hesperocyparis macnabiana


Citation for this treatment: Jim A. Bartel 2016. Hesperocyparis macnabiana, in Jepson Flora Project (eds.) Jepson eFlora,, accessed on April 30, 2016.

Citation for the whole project: Jepson Flora Project (eds.) 2016. Jepson eFlora,, accessed on April 30, 2016.

Hesperocyparis macnabiana
click for enlargement
© 2009 George W. Hartwell
Hesperocyparis macnabiana
click for enlargement
© 2009 George W. Hartwell
Hesperocyparis macnabiana
click for enlargement
© 2006 George W. Hartwell
Hesperocyparis macnabiana
click for enlargement
© 2011 California Academy of Sciences
Hesperocyparis macnabiana
click for enlargement
© 2006 George W. Hartwell

More photos of Hesperocyparis macnabiana in CalPhotos

Geographic subdivisions for Hesperocyparis macnabiana:
NCoR, CaRF, n SNF;
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.