Xerophyte

Flowers

Not borne terminally, white to greenish white, 6-8 cm long, c. 4 cm across, pericarpels and floral tubes with minute scales but without hairs, bristles, or spines. Inner perianth-segments short, rounded and mucronate, white.the production of male and female reproductive elements at different times by a hermaphroditic organism in order to ensure cross-fertilization. Various attributes observed in the floral biology of Praecereus euchlorusSN|7218]]SN|7218]] suggest the unusual occurrence of dichogamy in its flowers, that is to say the production of male and female reproductive elements occurs at different times in order to ensure cross-fertilization.

Spines

As many as 20, weak, whitish, needle-like, the centrals to 3-4 cm long, black at first, the radials to 10 mm long.

Ribs

(4-)8-11(-14), low, acute.

Stem

Slender 4-8 cm in diameter, green.

Fruits

Ovoid to oblong, 4-5 x 3-4 cm, red, minutely scaly, splitting on one side when mature to reveal white pulp, the withered perianth or at least the style persistent.

Areoles

c. 2 cm apart, white.