E U CO MM I A 637 
and Hooker. See Ann . Bot. xvn. 1903, p. 743, and xvm. 1904, 
p. 179. 
Crawfurdia Wall. Gentianaceae (1-3). 10 sp. warmer Asia. 
Crossosoma Nutt. Crossosomataceae. 2 sp. S.W. U. S., placed in 
Dilleniaceae by Bentham and Hooker. 
Crossosomataceae. Dicotyledons (Archichl. Rosales). Only genus 
Crossosoma. 
Croton: after Cascarilla add (Florida, W. I.) and at end add The 
ornamental Crotons of trop. gardens are sp. of.Codiaeum. 
Cryptolepis R. Br. Asclepiadaceae (1. 1). 15 sp. trop. As. and Afr. 
Cryptostegia R. Br. Asclepiadaceae (1. 1). 2 sp. trop. As. and Afr. 
Cyanastraceae. Monocotyledons (Farinosae). Only genus Cyanastrum 
(4 sp. trop. Afr.). 
Cyathocalyx Champ, ex Hook. f. et Thoms. Anonaceae ( 6 ). 10 sp. 
Indo-mal. 
Cymodocea Kon. Potamog^tonaceae (Naiadaceae, Bentham- Hooker). 
7 sp. mostly trop. 
Cynomoriaceae. Dicotyledons (Archichl. Santalales). An order now 
separated from Balanophoraceae, and containing Cynomorium. 
Cyperus: read (Mich.) L. (incl. Mariscus Gaertn., Pycreus Beauv.) 
and add C. rotundus L., which has a creeping tuberous rhizome, is 
a troublesome weed in trop. and subtrop. countries. 
Cyphomandra : add C. betacea Sendt. is the tree tomato, cult, in trop. 
Mts. for its edible fruit. 
Dacryodes Vahl. Burseraceae. 2 sp. W. Ind. D. hexandra Griseb., 
the gommier, yields an incense. 
Daemonorops Blume = Calamus L. 
Decaisnea : after Himal. insert China. 
Dennstaedtia Bern. Polypodiaceae. 60 sp. trop., S. Am., Austr. 
Diplazium Sw. Polypodiaceae. 210 sp. trop., Chi., Japan. 
Diplospora DC. Rubiaceae (1. 8). 15 sp. trop. As., China. 
Dipteris Reinw. Polypodiaceae. Incl. in Polypodium by Hooker, 
but very distinct. Cf. Seward and Dale in Phil . Trans. 194. 
Disperis Sw. Orchidaceae (3). 20 sp. trop. As., trop. and S. Afr. 
Doona Thw. Dipterocarpaceae. n sp. Ceylon. 
Dregea E. Mey. Asclepiadaceae (11. 4). 5 sp. Afr., As. 
Drynaria (Bory) J. Sm. Polypodiaceae. 15 sp. trop. As., Masc. &c. 
Duabanga Buch.-Ham. Blattiaceae (Lythraceae Bentham-Hooker). 
2 sp. Indo-mal. 
Elaphoglossum Schott. Polypodiaceae. 250 sp. trop. Added to 
Acrostichum by Hooker. 
Erycibe Roxb. Convolvulaceae (1. 5). 12 sp. Indo-mal., Polynesia. 
Eucommia Oliv. Trochodendraceae. 1 sp. China, E. ulmoides Oliv., 
yielding a medicinal bark used in China, and caoutchouc. Sometimes 
placed (e.g. by Engler in his last edition) in a monotypic order 
Eucommiaceae beside Trochodendraceae. 
