BRITTON AND ROSE 



PLATE XII 







- VJMC ?#M3*tf> 







2 



' -'-L 



'"'-'" ""' **^- ; ' 



P, '^^^EPswdteJfcBi^. 7 *'" ' "- - . -. *- _. "" 



Jf^"^^ v 



1. Plants of Ofwntia fnlgida. 



2. A very open plant of Of>nntia spinosior. 



