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STUDIES IN THE CALENDULEAE
479
Fig. 3. Distribution of llie polymorphous species Chrysanthemoides monilifera (L.)
T. Norl. It extends from the Cape to Ihe neighbourhood of kilimanjaro, thus
reaching the area of Osteospermum Yaillantii iDecne) T. Norl. It shows four large
gaps in ils distribution in East Africa. The Limpopo and Zambesi intervals are
certainly correct, bul Ihe two northern intervals between the mountains south of
Lake Nyasa and Kilimanjaro may be considerably diminished when this area has
been möre thoroughly explored.
tion with other plants il then hecame extincl everywhere in the north
except ön Kilimanjaro, where it was enabled to survive right up to
Ihe present day owing lo favourable ecological conditions. It is not
improbable that this or a closely allied species will also be discovered
in other mountains in tropical East Africa. O. Volkensii lives under
moderate moisture conditions and can thus be regarded as a mesophyte.
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