Ptilimnium capillaceum mock bishop-weed Apiaceae PTCA; Q,bp (Z. Wang 2015), j; R, ok (Z. Wang 2015);

 

Ptilimnium capillaceum .photo copyright Marc and Maria Minno.www.afn.org

Ptilimnium capillaceum .photo copyright.Marc and Maria Minno.www.afn.org (Accessed 5/2014).

Ptilimnium capillaceum is an annual herb 20-80 cm tall, freely branched near top. 

Leaves alternate, 4-10 cm long, pinnately divided into diffuse, finely linear segments 0.5-2.5 cm long, usually in threes. 

Flowers white small, radially symmetrical, in umbrella-shaped clusters 2-5 cm wide with 5-15 rays; blooming July-Oct. 

Fruit dry, small, nut-like broadly egg-shaped 0.2-0.3 cm, 5-ribbed; fruiting Aug-Oct. (Hough 1983). 

Wetland status: OBL 

Frequency in NYC: Very infrequent. 

Origin: Native. 

Habitat: Fresh or brackish marshes, mostly along coast. 

Notes: Apiaceae of open sites are eaten by larvae of the black swallowtail butterfly, Papilio polyxenes (Papilionidae) (Tallamy 2003; Pyle 1981).