Abies ferreana Bordères & Gaussen

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Credits

Tom Christian (2021)

Recommended citation
Christian, T. (2021), 'Abies ferreana' from the website Trees and Shrubs Online (treesandshrubsonline.org/articles/abies/abies-ferreana/). Accessed 2021-10-24.

Genus

Common Names

  • Zhongdian Fir
  • Zhongdian Lengshan
  • Ferré Fir

Synonyms

  • Abies forrestii var. ferreana (Bordères & Gaussen) Farjon & Silba
  • Abies forrestii subsp. ferreana (Bordères & Gaussen) Silba
  • Abies rolii Bordères & Gaussen
  • Abies yuana Bordères & Gaussen

Glossary

Tibet
Traditional English name for the formerly independent state known to its people as Bod now the Tibet (Xizang) Autonomous Region of the People’s Republic of China. The name Xizang is used in lists of Chinese provinces.
Xizang
See Tibet.
acuminate
Narrowing gradually to a point.
apex
(pl. apices) Tip. apical At the apex.
article
(in Casuarinaceae) Portion of branchlet between each whorl of leaves.
bract
Reduced leaf often subtending flower or inflorescence.
cusp
A pointed end; curves meeting in a point.
emarginate
Notched at the apex.
exserted
Protruding; pushed out.
glabrous
Lacking hairs smooth. glabrescent Becoming hairless.
medial
Relating to the middle or median.
protologue
Text of first publication of a taxon’s name.
pubescent
Covered in hairs.
resin canal
Minute tubes containing resin-producing cells in the leaves and wood of conifers.
synonym
(syn.) (botanical) An alternative or former name for a taxon usually considered to be invalid (often given in brackets). Synonyms arise when a taxon has been described more than once (the prior name usually being the one accepted as correct) or if an article of the International Code of Botanical Nomenclature has been contravened requiring the publishing of a new name. Developments in taxonomic thought may be reflected in an increasing list of synonyms as generic or specific concepts change over time.
taxon
(pl. taxa) Group of organisms sharing the same taxonomic rank (family genus species infraspecific variety).
type specimen
A herbarium specimen cited in a taxonomic account to define a particular species or other taxon.
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.

Credits

Tom Christian (2021)

Recommended citation
Christian, T. (2021), 'Abies ferreana' from the website Trees and Shrubs Online (treesandshrubsonline.org/articles/abies/abies-ferreana/). Accessed 2021-10-24.

Tree to 20 m × 1 m dbh. Crown pyramidal in young trees; broad conical in mature trees. Bark grey and smooth at first, later grey-brown, developing fissures between longitudinal scales. Branchlets relatively slender (cf. A. forrestii, A. georgei), reddish-brown at first, densely ferruginous pubescent. Vegetative buds globose, resinous, smaller than in A. forrestii and A. georgei. Leaves pectinately arranged, parted beneath the shoot by a narrow or wide ‘V’, parted by a wide ‘V’ above on shaded shoots, otherwise somewhat assurgent with a proportion of needles upright above the shoot, 1–2.3 cm × 2–2.5 mm, base twisted, margins ~flat, apex emarginate, dark green above with two whitish stomatal bands beneath. Seed cones short-pedunculate, oblong to ovoid-cylindric, c. 5–8 × 3.5–4 cm; rich blue at first, maturing purplish-blue then bluish-black; seed scales flabellate-trapeziform, 1.6–2 × 1.6–2.2 cm at midcone; bracts oblong-cuneate-spathulate, exserted at maturity, apex rounded or emarginate, cusp erect at first, later erect, reflexed or recurved. (Debreczy & Rácz 2011Fu, Li & Mill 1999Bordères-Rey & Gaussen 1947).

Distribution  China Very locally in NW Yunnan, SW Sichuan, and possibly SE Xizang (Tibet)

Habitat Mixed or coniferous temperate forests, 3300–4000 m asl.

USDA Hardiness Zone 6b

RHS Hardiness Rating H6

Conservation status Endangered (EN)

Taxonomic note Abies ferreana belongs to a confusing group of firs allied to A. forrestii; their diversity is introduced and contextualised in the article ‘Abies forrestii and its relatives’. A variety, var. longibracteata L.K. Fu & Nan Li, has been described based on bracts more prominently exserted with an acuminate (cf. rounded or emarginate) apex (Fu & Li 1997) but in a new approach this is treated as a synonym of A. georgei here. See the A. georgei article for discussion. A. rolii and A. yuana are treated as synonyms following Farjon (1990), Debreczy & Rácz (2011), and the Flora of China (Fu, Li & Mill 1999); a rare example of total alignment between those works. Farjon (2017) treats A. ferreana as a variety of A. forrestii and includes A. chayuensis as a synonym, but the Flora of China maintains A. chayuensis as distinct; Debreczy and Rácz do not discuss it. It is probably distinct but may not be in cultivation (K. Rushforth pers. comm. 2020).

Bordères-Rey & Gaussen named Abies ferreana in 1947 for the French botanist Yvette de Ferré (1915–2003) who at the time had ‘already published beautiful works on conifers’ (Bordères-Rey & Gaussen 1947). It remains a poorly understood species, reportedly ocurring very locally in scattered stands in the same general area as A. georgei. Prominent among the barriers to better understanding it is the fact that Bordères-Rey & Gaussen only cited a single specimen in their protologue (Yu 12326) (Bordères-Rey & Gaussen 1947). Furthermore, their description appears to mix and match foliar characters from sterile and coning shoots; the latter are known for exhibiting atypical and variable character states, such as resin canal position (see below). Nevertheless, A. ferreana remains the most appropriate name for material distributed in NW Yunnan, SE Xizang (Tibet) and SW Sichuan, fitting neither A. forrestii nor A. georgei.

Much has been made of the medial position of the resin canals in the leaves of fertile branches of A. ferreana. This is an oft-cited character, but a variable one in many species, and it should probably not be relied upon as absolutely diagnostic (Panetsos 1992; and see genus description for further discussion). Nevertheless, A. ferreana can be distinguished from other closely related species in the following ways: one-year shoots dark reddish-brown (cf. yellowish-grey or yellowish-brown or grey-brown in A. chayuensis); shoots densely pubescent (cf. glabrous in A. forrestii); winter buds pale golden-brown with a translucent resin (cf. covered in a thick, chalky, wax-like resin in A. georgei) (Bordères-Rey & Gaussen 1947). The shape of the apex (exserted part) of the bract scale is emarginate, abruptly tapering to a cusp; in this character A. ferreana is similar to A. forrestii and to some forms of A. georgei, but it differs from these in its smaller seed cones, typically 5–8 cm long (cf. 10–14 cm long) (Farjon 2017; Bordères-Rey & Gaussen 1947; Fu, Li & Mill 1999). The bract cusp of A. ferreana can be elongated and erect, and this could reasonably be assumed to be the inference behind the name var. longibracteata, but the type specimen of that taxon is clearly referable to A. georgei (see that article for discussion).

A. ferreana was introduced to cultivation in the early 20th century by Forrest and later by Kingdon-Ward (Rushforth 1987) but it is doubtful that any old trees remain in collections. Several introductions since 1980 have been tentatively identified as this species, but only KGB 503 and C&H 6158 appear to be genuine. As they mature, it may be that some of the BCHM gatherings of 2011 are identified as this species. In cultivation it seems to prefer the same general conditions as A. forrestii and A. georgei.