shorter petioles; leaflets sessile two to four inches long by 
one-half to one inch broad, elliptic-oblong or -lanceolate, 
acuminate, serrate, dark green above, pale beneath. 
Flowers solitary, erect; one to one and a half inch in 
diameter, pure white; peduncle slender. Sepals six (rarely 
five or seven), oblong, obtuse, spreading, nerves faint. 
Stamens numerous, small; filaments rather short, filiform ; 
anthers minute, yellow. Carpels very numerous, slender, 
pubescent, forming a globose head. Achenes linear-oblong, 
compressed, with three to five obscure thick ribs, gradually 
narrowed into a short hooked style.—J. D. H. 
Fig. 1, Stamen ; 2, head of carpels; 3, immature carpel; 4, head of achenes; 
5, single achene :—all but fig. 4 enlarged. 
