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Hesperocyparis stephensonii

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)
Reference: Adams & Bartel 2009 Phytologia 91:287--299; Adams et al. 2009 Phytologia 91:160--185; Little 2006 Syst Bot 31:461--480
Unabridged Reference: Bartel et al. 2003 Biochem Syst Ecol 31:693--702

Hesperocyparis stephensonii (C.B. Wolf) Bartel
Habit: Tree (5)10--16 m. Stem: bark smooth, thin, peeling in thin strips or plates, red-brown to cherry-red; ultimate branches 1--1.3 mm diam, cylindric. Leaf: of 1 kind, gray-green; glands generally inactive, conspicuous or not, resin 0. Seed Cone: 17--27(30) mm, spheric, dull gray to brown; scales 6--8(10), projection conspicuous and conic. Seed: 3.6--6(8) mm, glaucous or not, dark to red-brown; attachment scar conspicuous. Chromosomes: 2n=22(23,24).
Ecology: Chaparral; Elevation: 910--1800 m. Bioregional Distribution: sw PR (Cuyamaca Mtns); Distribution Outside California: northwestern Baja California.
Synonyms: Callitropsis stephensonii (C.B. Wolf) D.P. Little; Cupressus arizonica Greene subsp. stephensonii (C.B. Wolf) E. Murray; Cupressus arizonica var. stephensonii (C.B. Wolf) Little; Cupressus arizonica subsp. revealiana (Silba) Silba; Cupressus arizonica var. revealiana Silba; Cupressus stephensonii C.B. Wolf; Hesperocyparis revealiana (Silba) Silba; Cupressus revealiana (Silba) Bisbee; Cupressus arizonica Greene subsp. arizonica, misappl.; Callitropsis arizonica (Greene) D.P. Little, misappl.; Cupressus arizonica var. glabra (Sudw.) Little, misappl;
Jepson eFlora Author: Jim A. Bartel
Reference: Adams & Bartel 2009 Phytologia 91:287--299; Adams et al. 2009 Phytologia 91:160--185; Little 2006 Syst Bot 31:461--480
Unabridged Reference: Bartel et al. 2003 Biochem Syst Ecol 31:693--702
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Listed on CNPS Rare Plant Inventory

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botanical illustration including Hesperocyparis stephensonii


Citation for this treatment: Jim A. Bartel 2012, Hesperocyparis stephensonii, in Jepson Flora Project (eds.) Jepson eFlora,, accessed on November 15, 2018.

Citation for the whole project: Jepson Flora Project (eds.) 2018, Jepson eFlora,, accessed on November 15, 2018.

Geographic subdivisions for Hesperocyparis stephensonii:
sw PR (Cuyamaca Mtns);
Markers link to CCH specimen records. Yellow markers indicate records that may provide evidence for eFlora range revision or may have georeferencing or identification issues. Purple markers indicate specimens collected from a garden, greenhouse, or other non-wild location.
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).

View elevation by latitude chart
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, if there are more than 1 infraspecific taxon in CA.
Blue line denotes eFlora flowering time.