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Key to Cupressaceae

Cupressaceae

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1
Leaves alternate.

(c) Wright, Janet - CC-BY-NC, permission granted to NCBG
(c) Danielson, Erik
  2
Leaves 4-sided or nearly circular (terete) in ×-section; [subfamily Taxodioideae]
 ⇒ Cryptomeria japonica

(c) Weakley, Alan
  2
Leaves distinctly flattened (2-sided).

(c) Wright, Janet - CC-BY-NC, permission granted to NCBG
    3
Leaves evergreen, rigid, > 2 cm long, tapering from near the base to a long-acuminate apex; [subfamily Cunninghamioideae]
 ⇒ Cunninghamia lanceolata

(c) Wright, Janet - CC-BY-NC, permission granted to NCBG
(c) Wright, Janet - CC-BY-NC, permission granted to NCBG
    3
Leaves deciduous, flexible, < 2 cm long, parallel-sided, the apex short-acute; [subfamily Taxodioideae]
 ⇒ Taxodium

(c) Campos, Aidan
(c) Bradley, Keith
1
Leaves opposite or whorled.

(c) Ware, Richard & Teresa - CC-BY-NC, permission granted to NCBG
  4
Leaves deciduous; [subfamily Sequoioideae]
 ⇒ Metasequoia glyptostroboides

(c) Danielson, Erik
(c) Ware, Richard & Teresa - CC-BY-NC, permission granted to NCBG
  4
Leaves evergreen.
    5
Plants dioecious, male and female cones on separate plants; mature female cones fleshy and berry-like, with smooth surfaces, indehiscent; branchlets not disposed in one plane, thus bushy and not fan-like; leaves of a branchlet monomorphic; [subfamily Cupressoideae]
 ⇒ Juniperus

(c) Cressler, Alan M.
(c) Danielson, Erik
(c) Fleming, Gary P.
    5
Plants monoecious, male and female cones on the same plant; mature female cones woody or leathery, with irregular surfaces, dehiscent; ; branchlets either disposed in one plane, thus flattened and fan-like, or not disposed in one plane, thus bushy and not fan-like; leaves of a branchlet either monomorphic (Callitris, Hesperocyparis) or dimorphic.
      6
Leaves in whorls of 3; [subfamily Actinostroboideae]
 ⇒ Callitris glaucophylla

(c) Robbins, Ashleigh - CC-BY
      6
Leaves opposite (decussate), in 4 ranks; [subfamily Cupressoideae].

(c) Lange, Corey - CC-BY-NC, permission granted to NCBG
        7
Leaves of a branchlet monomorphic; branchlets not disposed in one plane, thus bushy and not fan-like; female cone globose, 20-30 mm in diameter
 ⇒ Hesperocyparis arizonica

(c) Lange, Corey - CC-BY-NC, permission granted to NCBG
(c) Lange, Corey - CC-BY-NC, permission granted to NCBG
        7
Leaves of a branchlet dimorphic; branchlets disposed in one plane; thus flattened and fan-like; female cone < 12 mm in diameter.
          8
Leaves acute; female cones globose and woody, the hard scales peltate, not imbricate; ultimate branchlets (including the scale leaves) about 1 mm broad
 ⇒ Chamaecyparis

(c) Ward, Scott G
          8
Leaves obtuse; female cones ellipsoid and leathery, the pliable scales basally attached, imbricate; ultimate branchlets (including the scale leaves) about 1.5 mm broad

(c) Bradley, Keith
             9
Branchlets flattened in vertical planes; seeds wingless; [planted tree, sometimes persistent]
 ⇒ Platycladus orientalis

(c) Campos, Aidan
(c) Campos, Aidan
             9
Branchlets flattened in horizontal planes; seeds winged; [native tree, but also sometimes planted]
 ⇒ Thuja occidentalis

(c) Bradley, Keith