Ostrya

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Related to Hop-hornbeam: Ostrya virginiana

Ostrya

 

(hop-hornbeam), a genus of deciduous monoecious trees of the family Betulaceae. The trees are 10–25 m tall and have longitudinally fissured bark. The leaves are alternate and irregularly double-toothed. The staminate flowers have no perianth and are arranged in a single cylindrical catkin along the longitudinal axis. The pistillate flowers have a plain perianth and are arranged in two’s in reduced dichasia, which are gathered, in turn, into short, thick catkins. Each pistillate flower is surrounded by a pitcher-shaped membranous involucre formed of concresced bracts, giving the cone-shaped female catkin a resemblance to the female inflorescences of hop plants. The involucre is closed when fruits are present; the fruits are nuts.

There are five species (according to other sources, ten) of hophornbeam, distributed in the northern hemisphere. The species O. carpinifolia occurs in the USSR; it grows wild in the mixed forests of the Caucasus. A tree reaching 15 m in height (sometimes to 22 m), it has double-toothed, short-petioled leaves and rough, scaly bark. The bark is a source of dyes and is used for tanning leather. The wood is valuable, but the reserves of this relict species are not great. The American hop-hornbeam (O. virginiana) is cultivated in the European USSR and in the Caucasus.

REFERENCE

Derev’ia i kustarniki SSSR, vol. 1. Moscow-Leningrad, 1951.

V. N. GLADKOVA

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Too few hop-hornbeam trees were measured in early samples to assess the relationship between growth rate and mortality.
Hop-hornbeam growth was influenced by both hemlock and maple influence index, and by total influence index in interaction with plot group and dbh.
Total neighbor influence index affected chance of mortality for all species except hop-hornbeam (logistic regression, Mann-Whitney and resampling comparisons, P [less than] 0.