the REST of the pictures on this page will give you a better overall feel for this wood
sen / Kalopanax septemlobus
(synonyms Acanthopanax ricinifolius, Kalopanax ricinifolium)
of the family Araliaceae, the ivy and ginseng family
3" x 3" flat cut, 5" x 5" quartersawn, 3/4" wide end grain, and a 1/4" x 1/4" end grain closeup.
Ring porous with a thin row of earlywood pores changing immediately to latewood with confluent parenchyma pore groupings that are vaguely ulmiform.
In the USA this wood is frequently sold as "Japanese ash" and while it does look a great deal like ash, it is not in fact related to ash. I am particularly grateful to Paul van Rijckevorsel for clarifying this for me, as I had mistakenly included sen on my ash page in the early days of this site. The face grain can have quite a striking similarity to ash but the end grain is easily distinguished from ash.
In Japan, where it goes under the trade name Harigiri, this is a very popular wood for paneling and furniture. In the USA it is frequently sold as veneer and rarely as lumber.
LATER NOTE: I now notice that flat cut sen face grain is distinguishable from flat cut ash face grain by virtue of the difference in the look of the cut pores on a flat cut surface. In ash, there is a strong "feathering" due to the earlywood pore line being several pores thick. In sen there is only a thin row so no feathering. Then in sen there are usually faint lines in between the grain lines that are angled to the grain lines. This is because of the confulent parenchyma bands throughout the latewood. Ash has only a small amount of confulent parenchyma and it's at the end of the latewood, thus ash doesn't have the angled lines on the face grain. See the flat cut veneer at the bottom of my own pics for examples.