Picea koyamae Shirasawa

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Credits

Article from Bean's Trees and Shrubs Hardy in the British Isles

Recommended citation
'Picea koyamae' from the website Trees and Shrubs Online (treesandshrubsonline.org/articles/picea/picea-koyamae/). Accessed 2019-12-05.

Genus

Glossary

appressed
Lying flat against an object.
glabrous
Lacking hairs smooth. glabrescent Becoming hairless.
glandular
Bearing glands.
included
(botanical) Contained within another part or organ.
ovoid
Egg-shaped solid.
variety
(var.) Taxonomic rank (varietas) grouping variants of a species with relatively minor differentiation in a few characters but occurring as recognisable populations. Often loosely used for rare minor variants more usefully ranked as forms.

References

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Credits

Article from Bean's Trees and Shrubs Hardy in the British Isles

Recommended citation
'Picea koyamae' from the website Trees and Shrubs Online (treesandshrubsonline.org/articles/picea/picea-koyamae/). Accessed 2019-12-05.

A tree 40 to 60 ft high in Japan, with a slender trunk and of densely branched, pyramidal habit, with a dark brown or blackish bark peeling off in paper-like flakes; young shoots brown, stronger leading shoots glabrous or slightly glandular, the lateral ones always more or less glandular-bristly; buds conical, light brown or purplish brown, resinous. Leaves 14 to 58 in. long, rigid, four-sided, dark green or grey-green, those on the upper side of the shoot pointing forward and upward (i.e., not appressed to the shoot), the under ones pectinately arranged. Cones cylindrical (smaller ones ovoid-cylindrical), 2 to 4 in. long, 114 to 112 in. wide, shining pale brown; scales broad and rounded, with slightly jagged margins.

This spruce was discovered in the Shinano province of Central Japan by Koyama, on Yatsugatake, at elevations of 5,000 to 6,000 ft; afterwards found in Korea, where Wilson collected it in 1917. It was introduced by him from Japan in 1914 to the Arnold Arboretum and thence to Kew in the following year; seed from the Korean expedition was distributed in Britain in 1918. According to Wilson, who visited its Japanese habitat in company with its discoverer in 1914, this spruce is only known to exist there in a grove of about one hundred trees. He described it as shapely and decidedly ornamental.

P. koyamae is hardy in Britain but only to be seen in a few collections. Among the largest specimens are: National Pinetum, Bedgebury, Kent, pl. 1928, 57 × 5 ft (1970); Warnham Court, Sussex, 60 × 4 ft (1971); Borde Hill, Sussex, 70 × 414 ft (1973); Stanage Park, Radnor, 66 × 4 ft (1970). There is a tree measuring 44 × 212 ft in the Pinetum of the Royal Horticultural Society at Wisley (1969).

From the Supplement (Vol. V)

Whether this species extends to the mainland of east Asia depends on the status given to related spruces occurring in the mountains of Korea, north-east China and the Ussuri region of Russia. Three names are involved: P. koraiensis Nakai, P. pungsanlensis Uyeki ex Nakai and P. intercedens Nakai. The first has been included in P. koyamae in synonymy, or treated as a variety of it, but other authorities accept it as a distinct species with the other two under it as varieties. The Chinese form or ally of P. koyamae was seen by Roy Lancaster in the Changbai reserve near the Korean border, where it makes a neat symmetrical tree with sea-green or grey-green foliage, growing scattered with P. jezoensis.

specimens: R.H.S. Garden, Wisley, Surrey, 47 × 234 ft (1975); Borde Hill, Sussex, 70 × 412 ft (1979); Warnham Court, Sussex, this tree died 1978; National Pinetum, Bedgebury, Kent, pl. 1928, 66 × 534 ft (1981); Stanage Park, Powys, 70 × 414 ft (1978); Whitehills, Kirkc., 66 × 234 ft (1984); Blairquhan, Ayrs., 59 × 412 ft (1984).


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