OF THE CAMEROONS MOUNTAINS, ETO. 177 
of the tropical forms and the descent of the temperate. Thus 
we have— 
1. Plants of purely tropical forms, ascending up to and above 
5000 ft., but whose normal limit is below it. The most remarkable 
cases are— 
feet. feet. 
Stephania............ to 7,000 | Gynura.............. to 8,500 
Drynaria ............ » 4,000 | Cephalostigma........ » 7,000 
Clausena ............ » 7,000 | Anthocleista.......... » 4/,000 
Brucea .............. » 7,000 | Alectra ......... seus. » 7,000 
Gomphia ............ » 9,000 | Sopubia.............. » 41,000 
Schmidelia .......... » 7,000 | Coleus .............. » 7,000 
Desmodium .......... » 7,000 | Leucas .......... co , 8,000 
Shuteria ............ » 7,000 | Achyranthes.......... xs 7,000 
Dalbergia............ » 5,000 | Cyathula ............ » 10,000 
Kalanchoë ........ o» 7,000 | Phyllanthus.......... » 7,000 
Mukia .............. » 7,000 | Urera ............. e » 5,000 
Loranthus .......... » 8,000 | Peperomia .......... », 8,000 
Ixora .............. » 5,000 | Bolbophyllum ........ , 6,000 
Mikania ............ » 7,000 | Angraecum .......... » 6,000 
Microglossa .......... » 7,000 | Polystachya.......... , 6,000 
Dichrocephala ........ » 10,700 | Calanthe ............ „ 5,000 
Blumea.............. , 8,000 | Commelyna .......... , 7,000 
I have excluded here the annuals, which so often owe their 
upward extension to local circumstances that do not annually 
recur; as also all the Panicoid and Andropogonoid grasses. Also 
many genera which have almost equal claim to rank as temperate 
. and as tropical, as Pittosporum, Impatiens, Ilex, Vernonia, Celsia, 
&c. &c. 
From a tabulation of these, I find that there are, at elevations 
above 5000 ft.,— 
Genera. Species. 
* Truly temperate forms........ 02 80 112 
Temperate and tropical, or intermediate 86 .... 60 
46 .... 65 
Truly tropical ....... e teres 
2. The temperate forms that descend below 5000 ft. are com- 
paratively few. The principal are :— 
feet. feet. 
Clematis .............. to 4000 | Adenostemma.. ..... to 2000 
Hypericum ............ , 4000 | Senecio... , 2500 
Rubus .;.............. , 4000 | Leucothoé ........ , 4000 
Sanicula ...........0.. , 4000 | Ericinella....... «e , 4000 
Anthriscus ........... , 4000 
