Chamaecyparis thyoides (Atlantic White Cypress or Atlantic Whitecedar), is a species of Chamaecyparis, native to the Atlantic coast of North America from Maine south to Georgia, with a disjunct population on the Mexican Gulf coast from Florida to Mississippi. It grows on wet sites on the coastal plain at altitudes from sea level up to 50 m, more rarely in the foothills of the Appalachian Mountains up to 460 m altitude. The common name "Atlantic White Cedar" has been rejected by the American Joint Committee on Horticultural Nomenclature, as it is a cypress, not a cedar.
It is an evergreen coniferous tree growing to 20-28 m (rarely to 35 m) tall, with feathery foliage in moderately flattened sprays, green to glaucous blue-green in color. The leaves are scale-like, 2-4 mm long, and produced in opposite decussate pairs on somewhat flattened shoots; seedlings up to a year old have needle-like leaves. The seed cones are globose, 4-9 mm diameter, with 6-10 scales, green or purple, maturing brown in 5–7 months after pollination. The pollen cones are purple or brown, 1.5–3 mm long and 1–2 mm broad, releasing their yellow pollen in spring.
- Chamaecyparis thyoides subsp. thyoides (Atlantic White Cypress). Atlantic coast, Maine to Georgia. Leaves and cones usually glaucous blue-green; facial leaves flat, not ridged; cones 4-7 mm long. (Least concern)
- Chamaecyparis thyoides subsp. henryae (H.L.Li) E.Murray (Gulf White Cypress; syn. Chamaecyparis thyoides subsp. henryae (H.L.Li) Little; Chamaecyparis henryae H.L.Li). Mexican Gulf coast, Florida to Mississippi. Leaves and cones always green, not glaucous; facial leaves with a longitudinal ridge; cones 6-9 mm long. (Near threatened)
Cultivation and usesEdit
Chamaecyparis thyoides is of some importance in horticulture, with several cultivars of varying crown shape, growth rates and foliage color having been selected for garden planting. Named cultivars include 'Andelyensis' (dwarf, with dense foliage), 'Ericoides' (juvenile foliage), and 'Glauca' (strongly glaucous foliage). The wood is reported to endure moisture indefinitely; it has been used for fence-posts, ties and shingles. 
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- ↑ 1.0 1.1 1.2 Farjon, A. (2005). Monograph of Cupressaceae and Sciadopitys. Royal Botanic Gardens, Kew. ISBN 1-84246-068-4
- ↑ Germplasm Resources Information Network: Chamaecyparis thyoides
- ↑ Kelsey, H. P., & Dayton, W. A. (1942). Standardized Plant Names, ed.2. American Joint Committee on Horticultural Nomenclature. Horace McFarland Company, Harrisburg, Pa.
- ↑ 4.0 4.1 4.2 Rushforth, K. (1987). Conifers. Helm ISBN 0-7470-2801-X.
- ↑ Peattie, Donald Culross. Trees You Want to Know. Whitman Publishing Company, Racine, Wisconsin, 1934 p31
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