Arabis drummondii  Drummond’s rockcress Brassicaceae ARDR; R, js (planted);

  

Arabis drummondii. Mr. & Mrs. Robert G. Young @ USDA-NRCS PLANTS Database / USDA NRCS. 1992. Western wetland flora: Field office guide to plant species. West Region, Sacramento

Arabis drummondii. Mr. & Mrs. Robert G. Young @ USDA-NRCS PLANTS Database / USDA NRCS. 1992. Western wetland flora: Field office guide to plant species. West Region, Sacramento

Arabis drummondii is a biennial herb; erect 30-90 cm tall, often waxy-pale green. 

Leaves alternate, stalkless, lance-shaped, clasping-lobed at base, 2-8 cm long, margin entire to slightly toothed. 

Flowers pink to white, petals 4, 0.5-0.8 cm long, narrow at base, wide above. 

Fruit dry, hollow, elongate, linear, flattened, erect, 4-7 cm long, 0.1-0.2 cm wide, seeds in two rows on each side of internal partition, May-July. 

Wetland status: FACU. 

Frequency in NYC: Very infrequent. rare (NYS S1S2, U). 

Origin: Native. 

Habitat: Apparently seeded into a wetland mitigation site. 

Notes: Not previously known to occur in NYC. Arabis species are host to the larvae of the falcate orangetip butterfly, Anthocharis midea Pieridae (Pyle 1981).