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Remote Ready Biology Learning Activities has 50 remote-ready activities, which work for either your classroom or remote teaching.
Legal Issues
To avoid problems, (allergy etc) I would bring in the plant samples to the lab, have students view and record them in a variety of ways with different tools of their choice, (making certain that they are using nitrile gloves and goggles) and then at some later time
... maybe the spring when I know my students well and who may have allergies...
I will take the students outside with their drawings, images and/or pressed samples and see if they can match or identify them in an new season.