Bamboo in Oregon and Washington

My colleagues and I are trying to figure out which bamboo species are growing wild or quasi-wild in Oregon and Washington, and to map where they grow. Would you please help us by posting appropriate bamboo sightings in these two states?

We are most interested in wild bamboo that are spreading down waterways or were plants spread accidentally by human activities (earth moving, dumping yard waste). We also want to know about quasi-wild bamboo forming long-abandoned stands that have spread within their site (e.g. in abandoned home sites). We have some interest in plants that have spread from cultivation less extensively (e.g. into an adjacent road ditch or under a sidewalk), but we are not interested in clones that have spread a little in a garden or into adjacent property.

What to photo? (1) The whole plant. (2) The main stems, showing stem color, persisting leaf sheaths (if present), tops of those leaf sheaths, and color or structures at nodes. (Node = the thickened ring where leaves or branches originate.) A photo with your hand or some other standard can help tell how wide the main stems are. In one species here, the lowest few stem internodes (places between nodes) are very short, much shorter than most internodes; photo that if you notice it. (3) The number of branches that grow from one node on the main stem. (4) Leaf shape. (5) The bases of leaf blades, where there may be conspicuous hairs. Their presence or absence can be a useful clue for identification. (6) The rhizomes (horizontal stems) if visible, but no need to dig for them. (7) If you find new shoots growing up this year, photo the sheaths and those projections, vestigial leaf blades, that grow at the sheath tip.

Comments can help. Estimate plant height, if possible. (Or show a person standing near the bamboo, for scale.) Bamboo stems may be absolutely smooth, as if enameled, or may be minutely scabrous (rough). If rough, they may feel rough when running your hand up or down the stem or only one way. Please describe. Are the leaves green or glaucous (blue-green or gray-green) on the upper and/or lower surface?

Some wild stands have Bamboo Mites, genus Stigmaeopsis, (e.g. ). These don't matter to our project, but they can give you a second observation at the site, if you want. Be careful not to spread the mites to cultivated bamboo stands.

הועלה ב-אפריל 12, 2023 03:17 אחה"צ על ידי sedgequeen sedgequeen






מרץ 29, 2023 04:02 אחה"צ PDT


Voucher 21164. Computer suggests bambusa balcooa (Female Bamboo) but I have no idea if it knows. These two patches are growing in a young Douglas Fir plantation that now has a nearly closed canopy. Very long persistent from cultivation and spreading locally by rhizomes.


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