Geranium robertianum herb-robert Geraniaceae GERO*; NY, iw; Q, j (Stalter and Lamont 2002);



Geranium (Accessed 4/2014).

Geranium robertianum is an annual or biennial herb, to 60 cm tall from a taproot, stems weak, branched, spreading, hairy, often red, strongly scented; roots sparsely or facultatively associated with VA mycorrhizas (Brundrett and Kendrick 1988). 

Leaves alternate, palmately divided to base into 3-5 segments, the center segment stalked, all segments lobed or divided, tips rounded; becoming red in autumn. 

Flowers rose-purple, about 2 cm wide, 5 petals widest near top, base narrow, sepals 0.7-0.9 cm long tip with short beak; flowers usually in pairs from upper axils; blooms and fruits May-Oct. 

Fruit dry, linear above, 1-seeded carpels cupped in persistent calyx. 

Wetland status: UPL. 

Frequency in NYC: Very infrequent. 

Origin: Eurasia. 

Habitat: Dry woods.