272 
BOUCEROSIA 
Afr. and As. Like Stapelia. Included in Caralluma R. Er. in 
Nat. PJl. 
Bouchea Cham. Verbenaceae (il. 2). 20 sp. trop. 
Bouea Meissn. Anacardiaceae (1). 4 sp. Malaya. 
Bougainvillaea Comm. ex. Juss. Nyctaginaceae (1). 7 sp. S. Am. The 
group of 3 firs, is surrounded by 3 lilac or red bracts, which persist, 
and to some degree act as wings for the fruit. B. spectabilis Willd. 
is one of the most splendid flowering creepers in the tropics, but its 
lilac colour is difficult to harmonise with other things. 
Bourreria P Br. {Beureria P. Br. in Nat . PJl.) Boraginaceae (11). 
30 sp. trop. Am., W. Ind. 
Boussingaultia H. B. et K. Basellaceae (Chenopodiaceae, Bentham- 
Hooker). 10 sp. trop. Am. The tubers are eaten. 
Bouteloua Lag Gramineae (xi). 40 sp. Canada to S. Am., mainly 
in SW. U. S. (mesquit grasses, grama, side-oats). They form a large 
proportion of the herbage of the prairie, and are valuable as fodder. 
Bouvardia Salisb. Rubiaceae (1. 4). 30 sp. trop. Am. Some are 
heterostyled like Primula. Often cultivated for their firs. 
Bowenia Hook. Cycadaceae. 1 sp. Queensland, B. spectabilis Plook., 
easily recognised by the bipinnate leaf (see order). The upper part 
of the main root gives rise to curiously branched apogeotropic roots, 
which contain Anabaena (an alga) living in symbiosis with them, and 
branch exogenously {Ann. Bot., 1898). 
Bowiea Harv. Liliaceae (in). 1 sp. Cape Col., B. volubilis Harv. 
It is a xerophyte like Testudinaria, with a large partly underground 
stock (corm), giving off each year a much-branched climbing stem. 
This bears small leaves, but they soon drop off, and assimilation is 
carried on by the green tissue of the stem. 
Bowlesia Ruiz, et Pav. Umbelliferae (2). 20 sp. Am., Canary Is. 
Boykinia Nutt. Saxifragaceae (1). 7 sp. N. Am., Japan. 
Brachistus Miers. Solanaceae (11). 12 sp. Cent, and S. Am. 
Brachycome Cass. Compositae (ill). 50 sp. Austr., N. Z., N. Am., 
Afr. 
Brachycorythis Lindl. Orchidaceae (3). 4 sp. W. and S. Afr. 
Brachyglottis Forst. Compositae (vm). 1 sp. N.Z. 
Brachylaena R. Br. Compositae (iv). 6 sp. S. Afr. Shrubs. 
Brachyotum Triana. Melastomaceae (1). 30 sp. S. Am. 
Brachypodium Beauv. Gramineae (x). 10 sp. temp., and Mts. of 
trop. 2 in Brit, (false brome grass). Leaf reversed (cf. Alstroemeria). 
Brachysema R. Br. Leguminosae (ill. 2). 15 sp. Austr. 
Brachystelma R. Br. Asclepiadaceae (11. 4). 40 sp. palaeotrop. 
B. Bingeri A. Chev. has an edible tuber. 
Bradburia Torr. et Gray. Compositae (ill). 1 sp. Texas. 
Bradburya Rafin. = Wistaria Nutt, and Centrosema Benth. 
Bragantia Lour. {Apama Lamk.) Aristolochiaceae. 1 sp. Malaya. 
Brahea Mart. Palmae (1. 2). 2 sp. Mexico, Texas. 
