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The Geographical Distribution and Floristic Composition of the Orchids in the Gongga Mountain Region, Sichuan

Lang Kai-Yung   

  1.  (Institute of Botany, Academia Sinica, Beijing)
  • Received:1900-01-01 Revised:1900-01-01 Online:1985-12-18 Published:1985-12-18
  • Contact: Lang Kai-Yung

Abstract:

The Gongga Mountain Region, located on the eastern fringe of Qinghai-
Xizang Plateau and at the north-eastern end of Hengduan Mountains, is one of the
well-known large mountain areas in Sichuan Province.  There are forty five high peaks
with the elavation of 6000 m or over in the area, among which the Gongga Mountain
is the highest one, with its summit being at the altitude of 7556 m, whereas the Dadu
River Valley in the eastern part of the area is only 1150 m above sea level;  The rela-
tive height in the region is thus about 6400 m.
     As we know so far the orchids in Gongga Mountain Region comprise 34 genera and
75 species with 1 variety, of which 12 species are epiphytes, 59 species with 1 variety
terrestrials and 4 species saprophytes (Table 1.).
     I.  The geographical distribution in the Gongga Mountain Region.
     The vertical distribution of the orchids in the area.
     Eastern flank:  There are 39 species with  I  variety  of orchids  at  1150-2300
(-2400) m alt. in the subtropical evergreen broadleaf forest zone, of which 12 species,
such as Bulbophyllum andersonii, Dendrobium hancockii, Otochilus porrecta, etc., are
epiphytic (including a semiepiphyte, Pleione bulbocodioides), 25 species with 1 variety,
such as Bletilla formosana, Calanthe davidii, Cypripedium henryi, etc., are terrestrial,
and 2 species are saprophytic (i.e. Gastrodia elata and Neottia listeroides), the upper
limit of the real epiphytic orchids is 1800 m alt.  At the altitude 2300(-2400)-3600
(-3800) m, in the coniferous forest zone, found are 23 species, including 20 terrestrial
species with 1 variety, such as Amitostigma gonggashanicum, Calanthe fimbriata, Coe-
loglossum viride, etc., 2 saprophytic species (Neottia acuminata and Risleya atropurpu-
rea) and one semiepiphytic species.  There are only 2 terrestrial species (i.e. Cypripe-
dium tibeticum and Orchis chusua) at 3600(-3800)-4000m alt., in alpine shrub zone,
the upper limit of the terrestrial orchids being 4000 m alt.  At 4000-4400 m alt., in
alpine meadow zone no orchids have so far been found.
     Western flank:  There are 14 species of orchids, such as Habenaria limprichtii,
Hemipilia flabellata, Satyrium ciliatum, etc., at 2300-2800 m alt., in the river valley
shrub zone, and they all belong to the terrestrial orchids.  At the altitude of 2800-
3800m, in the coniferous forest zone found are 19 species of orchids, among which 18
species are terrestrial (such as Amitostigma monanthum, Cephalanthera longifolia, Pe-
ristylus coeloceras, etc.) and one is saprophytic.  There are only 4 species of terrestrial
orchids (i.e. Cypripedium tibeticum, Gymnadenia orchidis, Orchis chusua and O. dian-
tha) at 3800-4800 m alt., in the alpine shrub-meadow zone, the upper limit of vertical
distribution of terrestrial orchids being 4400 m alt.  Twelve species here are common
to the eastern flank.
      II.  The floristic composition of orchids in Gongga Mountain Region.
      1.  Twenty three species, belonging to 13 genera, are widespread in Whole East-
Asian Region.
      2.  Eight species, belonging to 8 genera, are the elements of the Sino-Japanese
Subregion.
     3.  Forty one species with 1 variety, belonging to 24 genera, are the elements of
the Sino-Himalayan Subregion, more than five times the elements of the Sino-Japanese
Subregion.
     4.  The floristic features of the orchids in the area.
      (1)  The floristic elements are mainly temperate and subtropical ones.
      (2)  The life form is mostly terrestrial.
      (3)  The species endemic to China are prolific (35 species with 1 variety, belong-
ing to 18 genera, are endemic to China, and 26 species with 1 variety are distributed
in south-western China and its adjacent region; Amitostigma gonggashanicum is endemic
to the area).
     The floristic composition of orchids in the area is characterized by the dominance
of terrestrial species and temperate and subtropical East-Asian elements, though with
a few Indo-African tropical elements (such as genus Satyrium (1 species) ).
     In conclusion, it may be considered that the species of orchids are abundant and
floristic elements are comparatively complex in the Gongga Mountain Region.

Key words: Gongga Mountain Region, Orchids

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