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Tall, triangular, grean leaves at top
This is a dark green plant. The stems are triangular or 3 sided. There are very small thin spikes at the end of each tip. Towards the top of the plant near the spikes it also has green leaves about 1-2 inches long and about a half inch wide. My plant is only 2 feet tall, however, I got it from my father-in-law and he has another one that he has had to trim it down when it reaches the ceiling.
Drought Smart Plants reply:
Hi Bill, this is one of the Euphorbia, which contain a really poisonous sap.
The sap if splashed or accidentally transmitted to your skin or eyes can be extremely damaging.
Please use extreme caution when handling this plant, particularly around children or pets.
Ingesting all parts of the plant can cause death, so these plants are not something to take lightly.
You can see more about Euphorbia here. Scroll down and look at other visitors stories about these dangerous, yet intriguing plants.
In particular see this story: Uncommon Plant which is very similar to your plant.
Poisonous Succulent Plants page will tell you more about these plants, and how to avoid problems.
Please make sure you click on the link that says 'How Dangerous are Euphorbias?" to go a site with more information.
Best of luck with your plant - stay safe!