This is “Cyperus alternifolius,” with common names “Umbrella papyrus,” “Umbrella sedge” or “Umbrella palm,” is a grass-like plant in the very large genus Cyperus of the sedge family, Cyperaceae.
Retired economics professor (“dismal scientist”). Married 40+ years to the love of my life; we have two grown daughters, both married, two granddaughters and a...