Populus maximowiczii Henry

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Credits

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

Recommended citation
'Populus maximowiczii' from the website Trees and Shrubs Online (treesandshrubsonline.org/articles/populus/populus-maximowiczii/). Accessed 2019-12-10.

Genus

Glossary

acuminate
Narrowing gradually to a point.
apex
(pl. apices) Tip. apical At the apex.
ciliate
Fringed with long hairs.
clone
Organism arising via vegetative or asexual reproduction.
cordate
Heart-shaped (i.e. with two equal lobes at the base).
cuneate
Wedge-shaped.
cusp
A pointed end; curves meeting in a point.
glabrous
Lacking hairs smooth. glabrescent Becoming hairless.
hybrid
Plant originating from the cross-fertilisation of genetically distinct individuals (e.g. two species or two subspecies).
included
(botanical) Contained within another part or organ.
ovate
Egg-shaped; broadest towards the stem.
conduplicate
(of leaves) Folded once lengthwise.
reticulate
Arranged in a net-like manner.
terete
Like a slender tapering cylinder.

References

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Credits

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

Recommended citation
'Populus maximowiczii' from the website Trees and Shrubs Online (treesandshrubsonline.org/articles/populus/populus-maximowiczii/). Accessed 2019-12-10.

A tree up to 100 ft high in the wild, its bark smooth and yellowish on young trees, becoming grey and deeply fissured on the trunks of old trees; stems terete, downy, green tinged with brownish red on the exposed side; buds 58 to 34 in. long, pointed, resinous. Leaves on the long shoots broad-elliptic, 3 to 5 in. long, 234 to 414 in. wide, rounded to slightly cordate at the base, apex very abruptly narrowed to a plicate cusp which points downward out of the plane of the leaf and often slightly to one side as well; those on the short shoots rather narrower, rounded-cuneate at the base. The leaves are slightly leathery, vivid green, dullish, reticulate above, whitish beneath, veins and veinlets finely downy on both surfaces, margins bluntly toothed, ciliate; petioles on the long shoots about 34 in. long, on the short shoots 1 to 112 in. long. Male catkins 2 to 4 in. long; stamens thirty to forty. Fruiting catkins up to 10 in. long; capsules shortly stalked, three- or four-valved, glabrous, ripening in September or October, much later than in most poplars.

A native of Japan, Manchuria, Korea, and the Russian Far East. It is a balsam poplar, closely allied to P. suaveolens, in which it was included until Augustine Henry separated it as a distinct species in 1913. At that time it was not in cultivation in Britain, but was introduced a few years later.

In the wild ‘this poplar grows to a larger size than any other species of eastern Asia, and ranks with the largest trees that grow there’ (E. H. Wilson, in Pl. Wils., Vol, 3, p. 33). It is also one of the most ornamental and distinct of the genus. The leaves unfold early in the spring and turn yellow before falling late in the autumn. Unfortunately it is susceptible to bacterial canker, but there is a promising young female tree in the Alice Holt collection which has so far remained free of infection, though its neighbours of the same species are heavily infected. This tree, nineteen years planted, measures 38 × 234 ft. The only other recorded tree in the United Kingdom is one in the Edinburgh Botanic Garden, measuring 50 × 312 ft (1967). All the other notable specimens are in Ireland: Rowallane, Co. Down, 55 × 514 ft, and, in Eire, Birr Castle, Co. Offaly,pl. 1927,58 × 514 ft; Mount Usher, Co. Wicklow, 52 × 434 ft and 48 × 512 ft; Headfort, Co. Meath, 78 × 534 ft (all measurements 1966).

P. maximowiczii has been used to produce hybrids for commercial planting. Of these the best known in Britain is ‘Androscoggin’, one of the Schreiner and Stout hybrids, raised from P. maximowiczii pollinated by P. trichocarpa, and therefore wholly a balsam hybrid. It is very fast growing, and has some value as an ornamental, but is not resistant to bacterial canker. The leaves show the influence of the seed-parent in their broadly ovate to roundish, abruptly acuminate leaves. It is a male clone. A tree in the Alice Holt collection, nineteen years planted, measures 67 × 414 ft (1973).

Other named hybrids from P. maximowiczii raised by Schreiner and Stout are: ‘Geneva’ and ‘Oxford’, two sister seedlings from a cross with the male clone of P. × berolinensis; and ‘Rochester’, from P. maximowiczii pollinated by P. nigra ‘Plantierensis’. The last-named might have some value as an ornamental, judging by the tree at Kew, which has made a handsome, densely leafy specimen. Planted in 1934, it measures 62 × 434 ft (1967).

The Schreiner and Stout hybrids mentioned above were raised in the USA on behalf of the Oxford Paper Company, and are usually known as the ‘OP hybrids’. Thirty-four different types of poplar were used in the breeding programme, and 13,000 seedlings were raised. After trial in the Company’s nursery at Frye, Maine, sixty-nine first selections were made, of which ten that seemed to be outstanding were named and described in 1934 (E. J. Schreiner and A. B. Stout, Bull. Torr. Bot. Club, Vol. 61, pp. 449-60). The hybrids of P. maximowiczii mentioned above belong to this ten, and so also do those referred to under P. × berolinensis. A later selection from the OP hybrids is P. × canadensis ‘Florence Biondi’ (q.v.).

From the Supplement (Vol. V)

specimens: Forest Research Station, Alice Holt, Hants, pl. 1954, 56 × 334 ft (1985); Rowallane, Co. Down., 60 × 534 ft (1976); Mount Usher, Co. Wicklow, Eire, 52 × 534 ft (1975); Birr Castle, Co. Wicklow, Eire, 75 × 7 ft (1985).

The specimen of ‘Androscoggin’ at Alice Holt, planted c. 1954, is now 85 × 512 ft (1985). Other examples are: Kingscliff Wood, Som., pl. 1958, 103 × 512 ft (1978); Thorp Perrow, Bedale, Yorks., 88 × 612 ft (1981); Edinburgh Botanic Garden, pl. 1958, 88 × 514 ft (1985).

The specimen at Kew of the admirable ‘Rochester’, pl. 1934, is 86 × 534 ft (1976) and there is a younger example at Alice Holt, pl. 1954, 62 × 434 ft (1985).


P suaveolens Fisch

P. balsamifera sens. Pallas in Fl. Ross., pl. 41 (excl. fig. B) – A species closely allied to P. maximowiczii, differing in its almost glabrous, smaller leaves and in its glabrescent petioles and branchlets. Native of E. Siberia (Dahuria), Mongolia, and the Russian Far East.The P. suaveolens of Fischer is a renaming (in 1841) of a poplar discovered by Pallas in Dahuria and figured in his Flora Rossica (1784), pl. 41, under the name P. balsamifera L. The plate, and the account accompanying it, also includes a poplar from the Altai mountains, of which a leaf is depicted as fig. b in plate 41. This Altai plant is P. laurijolia, but the type-specimen in the Fischer herbarium, which came from Pallas’ herbarium, represents the Dahurian tree (Rehder, Journ. Arn. Arb., Vol. 12, pp. 61-2).Fischer seems to have interpreted his P. suaveolens in a wide sense, since he sent to Kew in 1843 a specimen under this name which had been collected by Schrenk in Central Asia in the Dzungarski Alatau; this is clearly not the same as Pallas’ poplar from Dahuria, i.e., is not P. suaveolens, whatever Fischer may have thought. Also, oddly enough, the name P. suaveolens was in use in gardens and nurseries in western Europe some years before Fischer published it in 1841 (Loudon, Arb. et Frut. Brit. (1838), Vol. III, p. 1674; Vol. IV, pp. 2629, 2640, 2651). Presumably the plants so named derived from ones distributed by Fischer from the St Petersburg Botanic Garden, of which he was the first Director. But whether they were the true species it is impossible to say. P. suaveolens is the species typified by the Pallas specimen in Fischer’s herbarium; it does not belong to any poplar that Fischer chose to call by that name.The name P. suaveolens has been used for P. cathayana, P. maximowiczii, and even for P. balsamifera.

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