Smooth Arizona Cypress
Cupressus arizonica var. glabra
Native to (or naturalized in) Oregon:
- Evergreen tree, but may be shrub-like when subject to fires, dense, columnar with age, usually 20-40 ft (6-12 m) tall, sometimes less than 2 ft (0.6 m) wide but widens with age. Outer bark continually flakes away, revealing the very attractive smooth, cherry-red inner bark. Leaves are scale-like, 3 or 4 angled in cross-section, 2-3 mm long, sharply acuminate, keeled, highly glaucous giving the foliage a blue-green cast, they are usually conspicuously dotted with tiny white flecks which are pit-like, resin glands. Cones globose or oblong, about 2.5 cm, gray or brown, often glaucous at first, 3-4 pairs of scales, smooth or with scattered resin blisters.
- Hardy to USDA Zone 7 Smooth Arizona Cypress is native to the mountains of central Arizona. The range of Arizona Cypress, Cupressus arizonica, extents from Arizona into Mexico and east to New Mexico and Texas and west to California.
- The species, Cupressus glabra (Cupressus arizonica), has been separated into as many as 5 varieties (var.), namely, arizonica, glabra, montanta, nevadensis and stephensonii. The Flora of North America does not recognize any varieties, although all at one time were described as separate species. The following is from the Flora of North America (www.efloras.org): Bark texture and foliage features have been used to distinguish geographic varieties or segregate species [of Cupressus arizonica]. Although bark texture may be consistent within populations, over the species as a whole there is complete intergradation between smooth and fibrous barks. Jacobson (1996, p. 181) states the Smooth Arizona Cypress is usually grown under the names of Cupressus arizonica or Cupressus glabra, and almost never sold under Cupressus arizonica var. glabra.
- Taxonomic Note: Cupressus glabra is also classified as Cupressus arizonica var. glabra, Callitropsis glabra, Hesperocyparis glabra, and included in Hesperocyparis stephensonii. Stay tuned.
A few selections of Cupressus glabra:
- 'Blue Ice' - tree, columnar form, leaves steel-blue
- 'Blue Spire' - narrow weeping form
- 'Chaparral' - dense, broadly columnar, creamy-white to "blue mint green"
- 'Raywoods Weeping' - very narrow, upright, secondary branches hang straight down.
- 'Sulphurea' - upright, compact columnar form, leaves sulfur-yellow
- glabra: smooth, a reference to the bark.
- Salem, OR: Bush Prairie Park, east of Bush House.