CHA MAEANGIS r 3 5 



Chaetospora R. Br. = Schoenus L. (Cyper.). 



Chaetostachys Valeton. Rubiaceae (n. 5). i New Guinea. 



Chaetostoma DC. Melastomaceae (I). 18 mid. and S. Brazil. 



Chaetosus Benth. Apocynaceae (i. i). i New Guinea. 



Chae othylax Nees. Acanthaceae (iv. B). 7 S. and C. Am. 



Chaetotropis Kunth. Gramineae (S). 2 Chili. 



Chaeturus Link. Gramineae (8). 2 Spanish Peninsula. 



Chaff-weed, Centitncutus minimus L. 



Chailletia DC. (Dichapetalum Thou.) Dichapet. 1 20 trop. Several 

 have epiphyllousinfl. \cf. Erythrochiton), probably arising by develop- 

 ment like that in infl. of Solanaceae, or cushions of Cactaceae. 



Chailletiaceae = Dichapetalaceae. 



Chain-fern (Am.), IVood-wardia. 



Chalarothyrsus Lindau. Acanthaceae (iv. B). r Mex. 



Chalaza, the base of the ovule; -ogainic, see Chalazogamae. 



Chalazocarpus fliern. Rubiaceae (i. 8). i Angola. 



Chalazogamae. A division of Angiospermae, proposed by Treub as 

 the outcome of his work upon Casuarina {Ann. Buitenzorg, X. 1891). 

 The ovules are developed in a peculiar way, and in each a number of 

 embryo-sacs (macrospores) form, many of which elongate downwards 

 right into the base (chalaza) of the ovule. Usually omy one is fertile. 

 The p. dleii tube passes through the style and the ovarial tissues, never 

 emerging from them, to the stalk of the ovule, which it enters from 

 the chalazal end. It passes upwards inside a sterile macrospore and 

 finally enters the fertile one and fertilises the ovum. The endosp. is 

 formed by the free nuclei in the embryo-sac, in the usual manner. 



Both in the development of the macrospores and in the process 

 of fert., the difference between Casuarina and all other known Angio- 

 sperms (except to some degree the Loranthaceae) was so marked, and 

 seemed to place Casuarina so much nearer to the Gymnospermae (q.v.), 

 that Treub proposed to rearrange the Angiosperms thus : 



f Dicotyledones. 



j Porogamae Monocotyledons. 



Angiospermae ( 



( Chalazogamae 



This proposition has not met with general acceptance. The 

 phenomenon has since been observed in various plants of the allied 

 orders Betulaceae, Fagaceae, Juglandaceae, Ulmus, Alchemilla, &c., 

 and cannot be regarded as of classificatory value. [See Nawaschin, 

 Bull. Ac. St Petarsb. 1899, Bot. Zeit. 1900, p. 38; Murbeck, Lnnds 

 Univ. Arsskr. 36, Bot. Centr. 86, p. 121.] 



Chalcanthus Boiss. (Hesperis L. BH.). Crucif. (4). i Persia. 



Chalcoelytrum Lunell. Gramineae (2). i S.E. U.S. 



Chalepophyllum Hook. f. Rubiaceae (i. 3). 2 Guiana. 



Chalicium (Cl.), a gravel-slide formation. 



Chalk-glands, Plumbaginaceae, Saxifraga\ -plant, Gypsophila, 



Chamabainia Wight. Urticaceae (3). i Indomal. 



Chamae- (Gr. pref.), ground-. 



Chamaealoe Berger. Liliaceae (in), i S. Afr. 



Chamaeangis Schlechter (Angraecum, &c. p.p.). Orchidaceae (n. 20). 

 5 Madagascar, Comoros. 



