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CUPRESSACEAE CYPRESS FAMILY

Jim A. Bartel, except as noted

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 plant, 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.
n=11.
30 genera, 130+ species: ± worldwide, especially North America, Eurasia. [Farjon 2005 Monogr Cupressaceae Sciadopitys. RBG, Kew] Incl (paraphyletic) Taxodiaceae. Taxa of (polyphyletic) Cupressus in TJM (1993) now in Callitropsis, Chamaecyparis, Hesperocyparis. —Scientific Editor: Thomas J. Rosatti.

Key to Cupressaceae

HESPEROCYPARIS WESTERN CYPRESS
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.
2n=22(23,24).
16 species: western and central North America, Central America. (Greek: western cypress) [Adams & Bartel 2009 Phytologia 91:287–299; Adams et al. 2009 Phytologia 91:160–185; Little 2006 Syst Bot 31:461–480]
Unabridged references: [Bartel et al. 2003 Biochem Syst Ecol 31:693–702]

Key to Hesperocyparis

H. macrocarpa (Hartw.) Bartel MONTEREY CYPRESS
NATIVE
Tree 18–25 m; crown asymmetric, often open, flat-topped to widely conic in age. Stem: bark fibrous, rich brown aging ash-gray; ultimate branches 0.9–1.2 mm diam, cylindric. Leaf: bright to dark green, not glaucous. Seed cone: 20–32(38) mm, spheric to elliptic, brown; scales 8–12, shiny when fresh; ± opening at maturity. Seed: 2.5–5 mm, not glaucous, dull red-brown to black; attachment scar ± white, conspicuous.
Closed-cone-pine/cypress forests; < 50 m in native range. North Coast, Central Coast, South Coast (native to Monterey Peninsula, Point Lobos), widely planted, naturalized outside native range. [Cupressus macrocarpa Hartw.; Callitropsis macrocarpa (Hartw.) D.P. Little] [Online Interchange] {CNPS list}

Previous taxon: Hesperocyparis macnabiana
Next taxon: Hesperocyparis nevadensis

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Citation for the whole project: Jepson Flora Project (eds.) 2013. Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html, accessed on Apr 24 2014
Citation for this treatment: [Author of taxon treatment] 2012. Hesperocyparis, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/cgi-bin/get_IJM.pl?tid=89298, accessed on Apr 24 2014

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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.