Kecksies or Kecks are the dried and withered stems of the Hemlock, and the name is occasionally applied to the living plant.
"The plant-lore and garden-craft of Shakespeare" by Henry Nicholson Ellacombe
Kecksies, stalks of hemlock, 224.
"Folk-lore of Shakespeare" by Thomas Firminger Thiselton-Dyer
On Sunday night these gallants went into the Imperial Hotel, Piazza, Covent-garden, and asked if "Mr. Kecksy" was there.
"Mornings at Bow Street" by John Wight