Hypericum acmosepalum N. Robson

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Credits

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

Recommended citation
'Hypericum acmosepalum' from the website Trees and Shrubs Online (treesandshrubsonline.org/articles/hypericum/hypericum-acmosepalum/). Accessed 2019-12-14.

Genus

Synonyms

  • H. patulum var. henryi Hort., in part, not Bean
  • H. kouytchense Hort., in part, not Lévi.
  • H. oblongifolium Hort., in part

Glossary

acuminate
Narrowing gradually to a point.
acute
Sharply pointed.
apex
(pl. apices) Tip. apical At the apex.
apiculate
With a short sharp point.
appressed
Lying flat against an object.
article
(in Casuarinaceae) Portion of branchlet between each whorl of leaves.
bud
Immature shoot protected by scales that develops into leaves and/or flowers.
glaucous
Grey-blue often from superficial layer of wax (bloom).
lanceolate
Lance-shaped; broadest in middle tapering to point.
linear
Strap-shaped.
oblanceolate
Inversely lanceolate; broadest towards apex.
obtuse
Blunt.
ovary
Lowest part of the carpel containing the ovules; later developing into the fruit.
ovate
Egg-shaped; broadest towards the stem.
ovoid
Egg-shaped solid.
keel petal
(in the flowers of some legumes) The two front petals fused together to form a keel-like structure.
terete
Like a slender tapering cylinder.
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
'Hypericum acmosepalum' from the website Trees and Shrubs Online (treesandshrubsonline.org/articles/hypericum/hypericum-acmosepalum/). Accessed 2019-12-14.

A semi-evergreen shrub 4 or 5 ft high, with arching branches; young stems reddish, flattened and four-angled beneath the flower clusters. Leaves very short-stalked, 34 to 214 in. long, 14 to 34 in. wide, elliptic, oblong-elliptic, or oblanceolate, blunt or rounded at the apex, sometimes shortly apiculate, wedge- shaped at the base, dark green above, pale and slightly glaucous beneath, with the veins, except the marginal loops, scarcely visible. Flowers 112 to 178 in. across, borne singly or in cymose clusters of two or three (occasionally up to six); buds ovoid, pointed at the apex. Sepals triangular-ovate to lanceolate or linear-lanceolate, tapered at the apex to a slender point, spreading in the bud-stage and after flowering. Petals golden yellow, spreading. Stamens about three-quarters as long as the petals, in five bundles. Styles free to the base, slightly shorter than the ovary.

Native of Yunnan, China; introduced by George Forrest, who also collected the type material under his number F.19448. This specimen was originally referred to H. patulum var. henryi and the cultivated plants have been grown under this name or as H. kouytchense or H. oblongifolium. The late Dr Stapf recognised that it was a distinct species but it was first described as such by Dr N. K. B. Robson in 1970 (Journ. R.H.S., Vol. 95, p. 494).

This is a very distinct and pretty hypericum, with unusually narrow leaves that colour red in the autumn. As will be seen from the coloured plates accompanying Dr Robson’s article (op. cit., fig. 238 and 240) the flowers resemble those of H. kouytchense in their shape and long stamens, but they are of a deeper yellow and the petal apiculus is not so sharp as in H. kouytchense and its immediate allies. It also grows taller than that species.

The following two species, both at present uncommon in gardens, are placed by Dr Robson in the same group as H. acmosepalum.

H. beanii N. Robson H. patulum var. henryi Bean – This species was described in 1905 (as H. patulum var. henryi) from a plant growing at Kew, raised from seeds sent from southern Yunnan, China, by Augustine Henry seven years earlier. It was distributed by Messrs R. Veitch of Exeter and no doubt by other nurserymen, but was soon superseded by other species that have wrongly been called H. patulum var. henryi in gardens (see H. pseudohenryi below, and H. forrestii). The characters that, in combination, serve to distinguish it from its allies (and from other species with which it might be confused) are: stems slightly flattened and four-lined near the ends and under the flowers; leaves obtuse at the apex, not mucronate; sepals ovate or narrowly so, acute or acuminate at the apex; stamens from one half to almost three-quarters as long as the petals; styles about two-thirds as long as the ovary.

The cultivar ‘Gold Cup’ is near to H. beanii but its leaves are lanceolate, the flower-buds are almost twice as long as wide (not barely longer than wide as in H. beanii and its allies) and the stamens and styles are rather shorter than is usually the case in H. beanii. It is a beautiful variety growing 3 to 5 ft high, with bright yellow cup-shaped flowers shading to paler yellow at the edges of the petals. The leaves turn pale red in the autumn.

H. pseudohenryi N. Robson H. patulum var. henryi sensu Rehd., in part, not Bean – This species, a native of W. China, was introduced by Wilson from the neighbourhood of Tatsien-lu (Kangting) in 1908 (W.1355). It was identified by Rehder as H. patulum var. henryi and at one time was common in gardens under that name but seems to have become rather rare (most of the plants grown under that name arc H. forrestii, q.v.). Its distinguishing characters, in combination, are: branchlets much flattened and four-lined at first, then two-lined, finally terete; sepals ovate or oblong, appressed to the buds and fruits; stamens about three-quarters as long as the petals or slightly longer; styles slightly longer than the ovary. In its long stamens it recalls H. kouytchense, but the petal apiculus is not hooked as in that spccies (q.v.).

From the Supplement (Vol. V)

H. beanii – This species was reintroduced by Roy Lancaster from the Kunming area of Yunnan in 1981 (L.711, L.751, L.752). For ‘Gold Cup’, mentioned as a cultivar of H. beanii, see this supplement, where it is further discussed under the name H. × cyathiflorum.

H. pseudohenryi – This is now in cultivation from seeds collected by Roy Lancaster in 1981 (L.1029) from above Kangding (Tatsien-lu), where Wilson had found it early this century. It should be added that the hypericum portrayed in Int. Dendr. Soc. Year Book 1980, p. 124, as H. pseudohenryi and mentioned under that name by Dr Robson on page 141 of the same issue, is in fact H. beanii (N. Robson, op. cit., p. 282). The seed-number in question is L.752.


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