CENTRA NTHERA 1 2 9 



Celastrus L. Celastraceae. 30 trop. and suhtrop. Climbing shrubs 

 with fruit like Eiionymus. 



Celebnia Nor. Inc. sed. Nomen. 



Celeriac, A pi it in g'-avtolens L. var. rapacfiini. 



Celery, Af>ium graveolens L. ; -pine, Phyltocladus. 



Cellulose, the carbohydrate of which cell walls are composed. 



Celmisia Cass. Compositae (3). 27 N.Z., Austr., &c. 



Celome Greene (Cleome L. p.p.). Capparid. (v). i N. Am. 



Celosia L. Amarantaceae (i). 35 trop. and temp., most interesting 

 C. cristata L., the cock's-comb, a cult, (but now hereditary) mon- 

 strosity, in which fasciation of the fls. of the infl. occurs. 



Celsa Veil. Zygophyllaceae. i Brazil. 



Celsia L. Scrophulariaceae (i. i). 40 Medit, Afr., As. 



Celtidaceae = Ulmaceae p.p. 



Celtis Tourn. Ulmaceae. 75 *. Like Ulmus, but with intr. anthers, 

 drupe, and curved embryo. Fr. of nettle-tree (C. australis L.) ed.; 

 wood useful for turning ; tree used as (odder in India. 



Cenarrlienes Labill. Proteaceae (i). i Tasmania. 



Cenchropsis Nash (Cenchnts p.p.). Gram. (5). i N. Am. 



Cenchrus L. Gramineae (5). 15 trop. and warm temp. Spikelet sur- 

 rounded by invol. of sterile spikelets, which in some sp. become hard 

 and prickly, surrounding the fr. and acting as a means of distribution 

 by animals (cf. Tribulus, &c.). C. tribuloitles L. is a very troublesome 

 pest in the wool-growing districts of N. Am. 



Cenia Comm. ex Juss. (CotiiLi p.p. EP.). Compositae (7). 9 S. Afr. 



Cenocentrum Gagnep. Malvaceae, i Indochina. 



Cenolophium Koch (Sdinuin p.p. BH.}. Umbel, (in. 5). i Eur., As. 



Cenostigma Tul. Leguminosae (n. 8). 3 Brazil, Paraguay. 



Censer-mechanism, Aconititm, and cf. Seed-dispersal. 



Centaurea L. Compositae (n). 600 cosmop., chiefly Medit. ; several 

 Brit. e.g. C. nigra L. (knapweed), C. Scabiosa L., C. Cyanus L. 

 (blue-bottle or cornflower). In the last two the outer fls. are neuter 

 with enlarged C (cf. Hydrangea). C. Calritrapa L. (star-thistle) has 

 long spiny invol. br. The fl. of C. shows the usual construction but 

 the sta. are sensitive to contact and when touched (e.g. by insects 

 probing) contract, thus forcing out the pollen at the top of tube. In 

 C. montana L. and others there is a nectary on each br. of the invol. 

 Numbers of ants are thus attracted. 



Centaurium Gilib. (Erythraea Borkh.). Gent. (i). 30 N. Am. 



Centaurodendron Johow. Compositae (n). i Juan Fernandez. 



Centauropsis Boj. Compositae (t). 3 Madagascar. 



Centaury, Erythraea Centaurium Pers. 



Centella L. (Hydrocotyle p.p. BH.}. Umbel, (i. i). 20 S. Afr. to As. 



Centema Hook. f. Amarantaceae (2). 5 trop. Afr. 



Centemopsis Schinz. Amarantaceae (2). 3 S. and trop. Afr. 



Centipeda Lour. Compositae (7). 5 Chili, Madag. , trop. As., Austr. 



Centotheca Desv. Gramineae (jo). 3 trop. As., Afr. 



Centradenia G. Don. Melastomaceae (i). 4 Mexico, Cent. Am. 

 C. rosea Lindl. shows habitual anisophylly. 



Centradeniastrum Cogn. Melastomaceae (i). i Peru. 



Centranthera R. Br. Scrophular. (in. 2). 5 trop. As., China, Austr. 



w. y 



