and abundant pale yellow to chartreuse flowers. Even more beautiful in bloom are the White Chin, G. schickendantzii; Dam's Chin, G, damsii with white flowers tinged pink; the Pink Chin, G. fleischerianum; the bright red G. venturianum; and the Dwar: Chin, G. quehlianum. In fact, almost any of the Chin Cacti are sure to bloom easily and profusely, sometimes when they are no larger than an inch in diameter.
The Ball Cacti Among other small cacti prized for easy and prolific blooming one must not overlook the Ball Cacti. Plants of" the genus Notocactus (noh-toe-kak'-lus) are popular for their small size, brightly colored spines, and large showy flowers. They are of easiest culture, and will take temperatures to 20CF Some attractive species rare the Sun Cup, M apricus, with soft gray spines and large yeilow blossoms; the Golden Ball, N. leninghausii, a ball of soft golden spines and lemon-yellow flowers; the Silver Ball, Ar, scop a, similar, but with a coat of beautiful silvery-white spines, the Indian Head, AT. ottonis. with glittering yellow blooms from spring till fall; and the Lemon Ball, N submammulosus, a ver\ free yellow bloomer.
Very like the notocacli are the parodias (pa-roh'-dee-ah), a charming group of small, free-blooming cacti ideal for the window-sill collection. The best known is the popular Tom Thumb Cactus, P. aureispina, a tiny golden-spined cactus thai never gcLs much bigger than a tennis ball and bears large orange flowers when scarcely an inch in diameter Equally interesting are P. mutabilis, with yellow blossoms, and the brilliant Crimson Parodia, P. sanguiniflora.
The Me/on Cacti— The Subtribe Cactanae
While the plants in this fifth subtribe are among the most unusual in the Cactus family and of especial historical interest because they were among the first cacti to be introduced to Europe, they are generally so slow in cultivation that they
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