CACTUS, ANHALONIUM, AND LOPHOPHORA.

1. CACTUS Linn. Sp. Pl. 466 (1753), restricted.

MAMILLARIA Haw. Synop. 177 (1812), not Stackh. (1809).

Usually globose to oblong plants (simple, branching or
cespitose), but sometimes slender-cylindrical, covered with
spine-bearing tubercles: flower-bearing areola axillary (with
reference to tubercles), entirely separate from the terminal
spine-bearing areola, although sometimes (Coryphantha) connected
with it by a woolly groove along the upper face of the tubercle:
ovary naked: seeds smooth or pitted: embryo usually straight,
with short cotyledons. Originally defined by Linnaeus in his
Systema, ed. l (1735).

The Linnaean genus Cactus of 1753 included 22 species and was
coextensive with the present order. In 1812 the species were
separated by Haworth into five genera, the original generic name
Cactus being discarded. Among these species C. mamillaris seems
to have stood as the type, not only of the Linnaean genus Cactus,
but also of Haworth's Mamillaria, and as such should retain the
original generic name. Besides, Mamillaria was used as the
generic name of an alga in 1809. Cactus mamillaris L. is the
West Indian Mamillaria simplex Haw.

From one point of view the two sections of the genus