Tree spotlight no.5 – the Hophornbeam

Hophornbeam

Hophornbeam or Ostrya is a genus of eight to ten small deciduous trees belonging to the birch family Betulaceae. Its common name is hophornbeam in American English and hop-hornbeam in British English. It may also be called ironwood, a name shared with a number of other plants.

The genus is native in southern Europe, southwest and eastern Asia, and North and Central America. They have a conical or irregular crown and a scaly, rough bark. They have alternate and double-toothed birch-like leaves 3–10 cm long. The flowers are produced in spring, with male catkins 5–10 cm long and female gaments 2–5 cm long. The fruit form in pendulous clusters 3–8 cm long with 6–20 seeds; each seed is a small nut 2–4mm long, fully enclosed in a bladder-like involucre.

hophornbeam details

The wood is very hard and heavy; the name Ostrya is derived from the Greek word ostrua, “bone-like”, referring to the very hard wood. Regarded as a weed tree by some foresters, this hard and stable wood was historically used to fashion plane soles. Ostrya species are used as food plants by the larvae of some Lepidoptera species, including winter moth, walnut sphinx, and Coleophora Ostryae. 

Colour/ Appearance: Wide sapwood is white to pale yellow.

Heartwood is a light brown, sometimes with a reddish hue.

Overall appearance can be very similar to birch.

Rot resistance: Heartwood is rated as non-durable to perishable regarding decay resistance, and is also susceptible to insect attack.

Workability: Overall, a difficult wood to work. Hophornbeam has high cutting resistance, (which also means that the finished wood product has good wear resistance). Reacts poorly to steam bending attempts. Turns, glues, and finishes well.

Odour :No characteristic odor.

Allergies/ Toxicity: Hophornbeam has been reported to cause skin irritation.

Pricing/ Availability: because of its small size, Hophornbeam is seldom harvested commercially. Likely to be limited in availability, even within its natural range. Expect prices to be high for a domestic hardwood.

Sustainability: This wood species is not listed in the CITES Appendices or on the IUCN Red List of Threatened Species.

Common Uses: furniture, canes, tool handles, and other turned objects.

Sierra Exif JPEG

plane tool

Trinity Ball – Trees cordoned off

Trinity College Trees Oregon Maple cordened off

When I called into Trinity College Dublin yesterday to meet and talk ‘Trinity Trees’ with David Taylor, David Hackett and Clodagh Dooley I was surprised to see many of the trees that are part of our project cordoned off in advance of the Trinity Ball which happens tonight.  I think they look great surrounded by the metal barriers – enveloped and protected.

Trinity College Trees Booklet

Trinity Trees book - front cover- Oregon Maple.jpg

Trinity College Dublin have compiled and printed a booklet entitled Trees of Trinity College Dublin. A third edition was printed in 2011 and it lists many of the trees to be found on campus. This booklet was jointly edited by David W. Jeffrey and Daniel L. Kelly, the later of which we are delighted to say will be consulting with us on some of the botany aspects of this project.

The booklet groups the various trees on campus into three sections. Each section is called a circuit and lists all the trees to be found in a particular area on campus. Circuit A encompasses the Front Square and Library Square. Circuit B includes trees situated in New Square and House 40 gardens. The final Circuit C covers all the trees in College Park.

Trees of Trinity College booklet-List of trees-tcd map-three tree circuts

Trees of Trinity College booklet also gives specific details on a select number of significant trees, three of which will be included in our project. These trees are the Hop Horn Beam, the Oregon Maple and the Cabbage Tree (Cordyline Palm). See below images of two of the listings in the booklet.

Trinity Trees book-Hop horn beam tree information.jpg

Trinity Trees book - Cabbage tree information