Jepson Flora Project: Jepson Interchange    

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Jepson Interchange (more information)
©Copyright 1993 by the Regents of the University of California

  • Up-to-date information about California vascular plants is available from the Jepson eFlora.



James R. Griffin

Tree or shrub, monoecious, evergreen
Stem: young crown conic; twig not grooved, resinous, generally persistent
Leaves simple, generally alternate, sometimes in bundles or appearing ± 2-ranked, linear or awl-like; bases decurrent, sometimes woody, persistent several years
Pollen cone generally < 6 cm, not woody, deciduous
Seed cone generally woody; bracts, scales generally persistent; scale not peltate, fused to or free from subtending bract
Seeds 2, on upper side of scale base
Genera in family: 10 genera, 193 species: mostly n hemisphere; many of great commercial value, supplying > half of world's timber
Reference: [Price 1989 J Arnold Arbor 70:247–305]



Stem: crown conic, top slender, generally nodding; branches ± drooping; bark reddish brown; twig hairy or puberulent, leaf bases ascending, wedge- or scale-like, persistent; bud ovoid
Leaves 5–25 mm, tapered to a short petiole above persistent base, spreading, ± 2-ranked or not, ± flat, sometimes grooved on upper surface, ridged on lower
Seed cone pendent, 1.2–7.5 cm, ovoid to oblong, opening 1st season; stalk ± 0; bract included, free from scale
Seed plus wing < 2 cm
Chromosomes: 2n=24 for all reports
Species in genus: 10 species: n hemisphere
Etymology: (Japanese: hemlock)


T. mertensiana (Bong.) Carrière


Stem: trunk < 35 m, 2.2 m wide, prostrate at timberline; mature bark red- or purple-brown, with narrow grooves between narrow ridges; twig puberulent
Leaves more crowded above twig, 10–25 mm, glaucous and with white bands on both surfaces, persistent < 7 years, tip rounded
Ecology: Subalpine, some scattered in cold areas of red-fir, mixed-conifer forest
Elevation: 1200–3500 m.
Bioregional distribution: Klamath Ranges, High North Coast Ranges, High Cascade Range, High Sierra Nevada, Modoc Plateau, n East of Sierra Nevada
Distribution outside California: to Alaska, Montana
Horticultural information: DRN, IRR: 1, 2, 4, 5 &SHD: 6, 7, 14, 15, 16, 17.

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