So diverse in life forms are the succulent spurges (Chapter 20) that it is not surprising to find the advantages of caudex formation exploited in several genera. In Euphorbia (21.25) there is £ tuberosa at the Cape, E. trichadenia from Angola to Rhodesia and E. baga in tropical West Africa, to quote but three. In Monadenium there is the miniature M. montanum and the even more attractive M. majus (21.16), a rare beauty with its modestly nodding cyanthia./a/rop/ia is a distantly related genus of 150 or more tropical shrubs, of which about a quarter qualify as caudiciforms (21.14). Botani-cally the genus is interesting for its simple unisexual flowers with a calyx and. in male flowers, a corolla too—very different from the advanced cyathia of the Euphorbieae (20.5). The above are all for experienced growers hardened to disappointments. Jalropha podagrica (21.15) grows rapidly from seed and is one of the easiest: it has large, stalked, lobed leaves, branching glandular stipules and flat heads of showy red flowers.

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