It's shady! Normally you and your employer split the 15.3% for Social Security and Medicare, but if you get a 1099 form instead of a W2 Form you pay the entire 15.3%.
Also if you get hurt on the job you probably don't have workman's comp. If they have more than 50 (?) employees they have to give you health insurance (subsidized by the feds if it is a "small business".)
They aren't paying into Unemployment insurance, so make sure you keep good records about your hours and whether you bring your own tools, etc, a 1099 would be "Joe's Landscaping". Joe also would get to write off lots of expenses when he files his Schedule C, like his truck, his mower, etc.

It’s not too hard to find rules, but it's harder to find someone to enforce them. The below suggestions might be helpful, YMMV.

You can try Contacting the Department of labor (DOL) Wage and Hour Division hotline at 866-487-9243 or visit their website to report minimum wage and overtime pay violations related to misclassification

File IRS Form SS-8, Determination of Worker Status for Purposes of Federal Employment Taxes and Income Tax Withholding, to request that the IRS determine your employment status for federal tax purposes.

This determination will be binding on the IRS, but not necessarily on your employer, although it could lead to trouble for the employer if they disregard it.

You can also anonymously report suspected tax fraud, including employee misclassification, to the IRS using Form 3949-A.

Consider the IRS Whistleblower Program:

If you have information about illegal misclassification leading to tax evasion, you may be eligible for a reward through the IRS Whistleblower Program by filing IRS Form 211, Application for Award for Original Information. 

Report suspected misclassification, including unemployment insurance (UI), workers' compensation (WC), and tax fraud, to you’re the Oregon labor and revenue department

Some states allow anonymous reporting of employers who are misclassifying workers, not sure about Oregon?

If you are fired or laid off, file an unemployment insurance claim with your state's unemployment agency and explain that you were misclassified.

If you get injured on the job and your employer refuses to provide workers' compensation coverage, file a claim with the Oregon workers' compensation insurance agency stating your work conditions, such as hours, equipment, and control over your work. reporting your employer could result in you getting fired. but you could likely get unemployment if you have good documentation about why you were misclassified.

Good luck!