Acer laxiflorum Pax

TSO logo

Sponsor this page

For information about how you could sponsor this page, see How You Can Help


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

Recommended citation
'Acer laxiflorum' from the website Trees and Shrubs Online ( Accessed 2019-12-06.



  • A. pectinatum subsp. laxiflorum (Pax) E. Murray


Other species in genus


Narrowing gradually to a point.
(pl. apices) Tip. apical At the apex.
(in Casuarinaceae) Portion of branchlet between each whorl of leaves.
Heart-shaped (i.e. with two equal lobes at the base).
Lacking hairs smooth. glabrescent Becoming hairless.
A collection of preserved plant specimens; also the building in which such specimens are housed.
Loose or open.
Egg-shaped; broadest towards the stem.
Covered in hairs.
(subsp.) Taxonomic rank for a group of organisms showing the principal characters of a species but with significant definable morphological differentiation. A subspecies occurs in populations that can occupy a distinct geographical range or habitat.
Dense layer of soft hairs. tomentose With tomentum.
(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.


There are currently no active references in this article.


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

Recommended citation
'Acer laxiflorum' from the website Trees and Shrubs Online ( Accessed 2019-12-06.

A small tree with glabrous young stems. Leaves membranaceous or somewhat leathery, rather narrowly oblongish-ovate, broadly cordate to rounded at the base, the apex gradually acuminate, prolonged into a tail-like point, 2 to 4 in. long, 112 to 2 in. wide, margins finely saw-toothed and lobulate or with short lateral lobes near the base, rusty pubescent on the veins beneath at first, later glabrous. Flowers and young fruits usually reddish, borne on long lax racemes; wings of fruits spreading at about a right-angle.

A native of W. China, described by Pax from specimens collected by Pratt near Tatsien-lu (Kating-fu) and by Faber on Mt Omei. The taxonomic boundaries of this species are a matter of dispute and have expanded and contracted according to this or that interpretation. In Plantae Wilsonanae, Vol. 3, p. 426, Rehder placed A. forrestii under A. laxiflorum in synonymy and this judgement, subsequently retracted, was widely accepted and adopted in previous editions of this work. As a result, many trees grown under the label A. laxiflorum are really A. forrestii, now very properly accepted as a distinct species. Secondly, in the first volume of the work cited (p. 94, 1911), Rehder described a variety of A. laxiflorum, namely var. longilobum, differing from the type chiefly in the five-lobed leaves with the veins beneath covered with a dense, yellowish, floccose tomentum. In 1933, however, (Journ. Arn. Arb., Vol. 14) Rehder placed this variety under A. taronense in synonymy, with the exclusion of Wilson’s specimen W. 4108 (see below), which he transferred to the typical part of A. laxiflorum. Finally, the maples grown under the collector’s number W. 4100 are not this species but fall well within the span of variation of A. maximowiczii. The corresponding herbarium specimen was in fact transferred to A. maximowiczii by Rehder in the article cited above.

With the exclusion of this alien material, A. laxiflorum becomes once again the species that Pax described (though the leaves are occasionally more lobed than in the type specimens). He placed it near to A. davidii, A. hookeri and A. crataegifolium, and it is perhaps most closely allied to the last of these, but differs in the larger, more finely toothed leaves and by the wings of the fruits spreading at about a right-angle (horizontal or widely spreading in A. crataegifolium). From the other two species it differs in its lobulate or slightly lobed leaves. Also, A. hookeri is a quite glabrous species, and A. davidii differs from A. laxiflorum in its much more coarsely toothed leaves, more abruptly acuminate at the apex. There should be no possibility of confusing A. laxiflorum with A. forrestii, which has strongly three-veined and three-lobed leaves, glabrous beneath.

The true A. laxiflorum is rare in cultivation but represented at Trewithen, Cornwall, by two specimens 20 to 25 ft high (1968). These agree well with Pax’s original description and figure. In Wilson 4108, as represented in the Edinburgh Botanic Garden, the leaves on the extension growths and young spurs are strongly three-lobed; on older, branched spurs they are less lobed but always strongly three-veined. The difference between this and the Trewithen trees is very striking, but it would appear to belong to A. laxiflorum as at present understood.

From the Supplement (Vol. V)

Of the species mentioned in the taxonomic discussion in the second paragraph, A. forrestii, A. maximowiczii and A. taronense are, like A. laxiflorum, reduced by E. Murray to the rank of subspecies of the Himalayan A. pectinatum.

A. rubescens – This species is now well-established in cultivation, and moderately hardy. The tree at Trewithen in Cornwall measures 60 × 6 ft (1985).

† A. caudatifolium Hayata A. kawakamii Koidz.;? A. morrisonense Hayata – This species, like A. rubescens a native of Formosa (Taiwan), was introduced to cultivation by Gordon Harris in 1971. The leaves are unlobed or shortly three-lobed, slenderly tapered at the apex. In A. rubescens the leaves are shortly five-lobed. The two species are united by E. Murray and placed under A. pectinatum as subsp. formosanum.

A rubescens Hayata

This rare maple is a native of Formosa (Taiwan), where it inhabits mountain forests at 6,000 to 8,000 ft and grows to 65 ft high; allied to A. laxiflorum; in cultivation at Trewithen from seed collected by Yashiroda some thirty years ago under his No. 109. Its closest ally is A. morrisonense Hayata, another Formosan species, under which it i splaced in synonymy by H. L. Li (Woody Flora of Taiwan, 1963).


A site produced by the International Dendrology Society.

For copyright and licence information, see the Licence page.

To contact the editors: