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Thuja ericoides

Description

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Family Cupressaceae

Trees or shrubs evergreen , monoecious or dioecious. Leaves decussate or in whorls of 3, scalelike and then often dimorphic with flattened facial leaves and keeled lateral leaves, or needlelike particularly in juvenile plants , often with an abaxial resin gland . Pollen cones terminal or axillary , solitary, maturing and shed annually; microsporophylls 6-16, decussate or whorled , each bearing (2 or) 3-6(-9) pollen sacs ; pollen wingless. Seed cones usually terminal, solitary, globose , ovoid , or oblong , dehiscent or indehiscent when mature in 1st or 2nd(or 3rd) year; cone scales developing after ovules originate in bract axils; bracts almost completely enveloped by cone scales, free only at apex; ovules 1-numerous per bract axil, erect ; cone scales of mature cones 3-16, flat or peltate, woody, leathery, or succulent, 1-20-seeded. Seeds winged or not; wings derived from seed coat . Cotyledons usually 2, rarely 3-6. Germination epigeal.

Nineteen genera and ca. 125 species: worldwide; eight genera (one introduced ) and 46 species (16 endemic, 13 introduced) in China.[1]

Genus Thuja

Trees evergreen , small to large. Branchlets flattened, in fan-shaped, flattened, frondlike sprays . Leaves opposite in 4 ranks . Adult leaves heteromorphic; those on larger branchlets with sharp, erect , free apices to ca. 2 mm; those on flattened lateral branchlets crowded, appressed , scalelike, lateral pairs keeled , facial pairs flat; abaxial glands present or absent. Pollen cones with 2--6 pairs of sporophylls, each sporophyll with 2--4 pollen sacs . Seed cones maturing and opening first year, ellipsoid , (6--) 9--14(--18) mm; scales persistent , 4--6 pairs, overlapping, oblong and basifixed , thin and woody, 2--3 central pairs fertile , uniformly thin or with slightly enlarged apex, remaining scales sterile. Seeds 1--3 per scale, lenticular , equally 2-winged; cotyledons 2. x = 11.

Species 5: North America, e Asia.[2]

Taxonomy

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Similar Species

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Members of the genus Thuja

ZipcodeZoo has pages for 57 species, subspecies, varieties, forms, and cultivars in this genus:

T. koraiensis (Korean Arbor-Vitae) · T. koraiensis 'Glauca Prostrata' (Korean Arborvitae) · T. occidentalis (American Arborvitae) · T. occidentalis 'Emerald' (Emerald Arborvitae) · T. occidentalis filiformis (Weeping Threadleaf Eastern Arborvitae) · T. occidentalis f. pendula (Weeping American Arborvitae) · T. occidentalis var. nigra (American Arborvitae) · T. occidentalis 'Sunkist' (Arborvitae) · T. occidentalis var. pyramidalis (American Arborvitae) · T. occidentalis var. Smaragd (Emerald Green Arborvitae) · T. occidentalis 'Brandon' (Brandon's Arborvitae) · T. occidentalis 'Danica' (Danica Arborvitae) · T. occidentalis 'Degroot's Spire' (American Arborvitae) · T. occidentalis 'Elegantissima' (American Arborvitae) · T. occidentalis 'Emerald Green' (American Arborvitae) · T. occidentalis 'Emerald Variegated' (American Arborvitae) · T. occidentalis 'Golden Globe' (American Arborvitae) · T. occidentalis 'Golden Tuffet' (American Arborvitae) · T. occidentalis 'Gracilis' (American Arborvitae) · T. occidentalis 'Hetz Midget' (American Arborvitae) · T. occidentalis 'Hill's Dark Green' (Hill's Dark Green Arborvitae) · T. occidentalis 'Holmstrup' (American Arborvitae) · T. occidentalis 'Janed Gold' (White Cedar 'janed Gold') · T. occidentalis 'Little Giant' (Little Giant Dwarf Arborvitae) · T. occidentalis 'Lutea' (American Arborvitae) · T. occidentalis 'Masonic' (Masonic Arborvitae) · T. occidentalis 'Rheingold' (American Arborvitae) · T. occidentalis 'Snow Tip' (American Arborvitae) · T. occidentalis 'Spiralis' (American Arborvitae) · T. occidentalis 'Techny' (American Arborvitae) · T. occidentalis 'Teddy' (American Arborvitae) · T. occidentalis 'Tiny Tim' (Arborvitae) · T. occidentalis 'Wansdyke Silver' (American Arborvitae) · T. occidentalis 'Wareana Lutescens' (American Arborvitae) · T. occidentalis 'Waterfield' (White Cedar 'waterfield') · T. occidentalis 'Woodwardii' (Globe Arborvitae) · T. occidentalis 'Yellow Ribbon' (American Arborvitae) · T. orientalis 'Aurea Nana' (Dwarf Golden Arborvitae) · T. orientalis 'Blue Cone' (Blue Cone Arborvitae) · T. orientalis 'Miller's Gold' (Chinese Arborvitae) · T. orientalis 'Westmont' (Westmont Arborvitae) · T. plicata (Giant Arborvitae) · T. plicata 'Atrovirens' (Atrovirens Western Red Cedar) · T. plicata 'Collyer's Gold' (Collyer's Gold Giant Arborvitae) · T. plicata 'Fastigiata' (Giant Arborvitae) · T. plicata 'Filiformis' (Giant Arborvitae) · T. plicata 'George Washington' (Giant Arborvitae) · T. plicata 'Green Giant' (Giant Arborvitae) · T. plicata 'Martin' (Western Red Cedar 'martin') · T. plicata 'Spring Grove' (Giant Arborvitae) · T. plicata 'Stoneham Gold' (Giant Arborvitae) · T. plicata 'Sunshine' (Giant Arborvitae) · T. plicata 'Virescens' (Giant Arborvitae) · T. plicata 'Whipcord' (Giant Arborvitae) · T. plicata 'Zebrina' (Giant Arborvitae) · T. standishii (Japanese Arborvitae) · T. x 'Steeplechase' (Steeplechase Arborvitae)

More Info

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Further Reading

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Notes

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Contributors

Identifiers

Footnotes

  1. Liguo Fu, Yong-fu Yu, Robert P. Adams & Aljos Farjon "Cupressaceae". in Flora of China Vol. 4 Page 62. Published by Science Press (Beijing) and Missouri Botanical Garden Press. Online at EFloras.org. [back]
  2. Kenton L. Chambers "Thuja". in Flora of North America Vol. 2. Oxford University Press. Online at EFloras.org. [back]
Last Revised: 2014-04-18