This is a working draft list of locations where cactus has been found in Maryland, excluding the Eastern Shore. (Eastern Shore sites may be added later.) If you know of a location not listed here, let me know at botanybill (at) verizon.net and I will put it on the list. Also if you would like to claim a site to watch, let me know.
- Flintstone – (at least three stations) – Opuntia humifusa s.s.
Anne Arundel County
- Global Command Antenna Field, Davidsonville
- Hancock’s Resolution – Field north of house
- Hancock’s Resolution – Planted in garden – Opuntia cespitosa
- Jug Bay, Parking Lot Meadow
- Jug Bay, Sand Barrens, Parris Glendenning Area (Wayson’s Corner?) (More info)
- Jug Bay, South Farm
- Milt’s Sand Pit, Sands Road – large population – old field (More info)
- Patuxent Research Refuge, Lake Allen – large population – Opuntia cespitosa – Bill Harms (More info)
- Patuxent Research Refuge, East of Tipton Field – likely planted many years ago – Opuntia cespitosa – Bill Harms
- Sandy Point State Park – Extirpated?
- Weinberg Park – Opuntia humifusa – probably planted.
- Wooton’s Landing – assumed to be planted in two stations.
- Factory Road – planted possibly from nearby wild stock – Opuntia cespitosa. (More info)
- Broome Island
- Flag Ponds
- Chapman State Park
- East of Emmitsburg
- Main Street, Elkridge – Planted next to a parking lot – Opuntia humifusa s.s. (more info)
- Bear Island
- southern end of the Billy Goat A Trail in C&O Canal NHP
- Plummer’s Island – Extirpated
- River Road, SSW of Poolesville
Prince George’s County
- Billingsley House
- MacGruder’s Landing
- Nottingham Road – apparently planted – tentatively Opuntia mesacantha ssp. mesacantha
- Priest Bridge
- Queen Anne Canoe Launch – open meadow – apparently Opuntia humifusa s.s.
- Rte 301 – small number of plants – planted
- Commander’s residence USN Solomon’s Recreation Area in Lawn
- Patuxent Naval Air Station, East side of Security Road at NE corner air station.
- Piney Point
- Kemps Mill