04.1013 
Gereus Macdonaldae 
lo\»6i ing iuay & j 1912 j slsius Qapli gp©©ri^ 2 cni. op loss in dianiGtox’j lapg© 
on©s somevdiat strongly ribbed and tubercled; ribs 6; areoles on. upper part 
of tubercles bearing 3 to 5 spines, short, sharp and strong, 1 to 2 mm. 
long; buds covered v/ith dark brown hairs; long aerial roots to aid in 
climbing; flower nocturnal, still somewhat open at 9.00 a 
ci. m. , 35 cm. 
long; calyx tube 20 cm. long, 1.5 to 4 cm. in diameter; bracts entirely 
r. 
covering ovary^j/ith areoles in 13 spiral rows turning to the right; areoles 
^ a 
on tube above bearing 5 spiral rows of areoles with bracts, also turning 
to the right, these supported by pillar-like projections; bracts green 
longer on upper part of tube and changing to purple with red tips 
with purplish tips; areoles bearing about 20 brown bristles 5 mm. or less 
A 
long and brown hairs, all pointing upwards; sepals, outer ones yellowish 
Ik 
red, inner ones yellow, 15 cm. long, 6.5 mm. wide, oblong linear to acumi- 
nate; ovary oblong oval, 6.5 mm. in diameter, 1.5 cm, long, having parietal 
