06.90 
Opimtia tuna 
Flov/ering May 14, 1912; joints elongated, elliptical, about 16 crn. long, 
5 cm. wide, 1 cm. thick, sage green, bearing areoles at intervals of 3 to 
4 cm.; new joints and flowers branch from ends of older ones; areoles sur- 
straw-colored 
rounded by a darker $€>lor , full of short stiff glochids, also bearing one 
spine near raw umber colored, 7 to 13 mm. long, curved slightly downward; 
flower node surrounded by a growth of glochids; calyx tube 3 cm. long, 16 
mm. in diameter at top, terete, tapering downward, with areoles near top 
bearing glochids and some bristles same color as those on joints; bracts 
green, broad at base, apiculate; sepals greenish, fading into yellov/, grad- 
ing into primrose yellow petals; petals broadly spatulate, slightly lighter 
colored on outside, 4 cm. long, 2.5 cm. greatest width; ovary inferior, 
having parietal placenta, 7 mm. long, 2.5 mm. greatest diameter, terete, 
tapering downward to point at bottom; throat wide and very shallow; stamens 
