Cactus

[Red Lowii]

 

[DragonsEye]

I like how many of the Mamms will throw a haku (head lei) of flowers at once. The yellow ones are particularly nice.

 

[catrus]

Is that yellow one a Mammillaria?

 

[DragonsEye]

Is that yellow one a Mammillaria?

Highly doubtful. The flower shape is atypical for a mamm and it appears that the flowers are held a goodly distance (relatively speaking) away from the plant -- also atypical for a mamm, and the plant in the background seems to be heavily/deeply ribbed -- yet again not typical of mamms.

 

[Gigantea]

Kind of has the shape of Lobivia flowers.