WEL IVITSCHIA 
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crevices the tips of the tendrils form large balls of tissue, the outer 
parts of which become mucilaginous and cement the tendril to its 
support. V. vinifera L. (Orient, N.W. India) is the cultivated grape; 
when dried the fruits form raisins. V. aestivalis Michx. (summer- 
grape) and V. Labrusca L. (fox-grape) are N. Am. sp. which have 
been largely introduced into Eur. , as they resist the attacks of the 
Phylloxera better than the Eur. sp. V. {A.) hederacea Ehrh. (N. Am.) 
and V. inconstans Miq. ( A . Veitchii hort. ; Japan) are the Virginian 
creepers so often cultivated. 
Vittaria Sm. Polypodiaceae. 10 sp. trop. and subtrop. 
Voandzeia Thou. Leguminosae (in. 10). V. subterranea Thou, is the 
only sp. (trop. Afr.); it buries its young fruits like Arachis. The 
seed is edible and the plant is largely cultivated. 
Vochisia Juss. ( Vochysia Poir.). Vochysiaceae. 54 sp. trop. Am. 
Vochysiaceae. Dicotyledons (Archichl. Geraniales). 5 gen. with 100 
sp., trop. S. Am. Trees and shrubs. See Nat . Pfi . for details. 
Placed in Polygalinae by Benth.- Hooker. 
Vouacapoua Aubl. = Andira Lam. 
Voyria Aubl. (incl. Leiphaimos Cham, et Schleclit., Voyidella Miq.). 
Gentianaceae (1). 23 sp. trop. Am. and Afr. 
Vriesia Lindl. = Tillandsia Linn. 
Wachendorfia Burm. Haemodoraceae. 7 sp. Cape Colony. Transverse 
zygomorphism is found in the fir. but is not obvious on account of the 
twisting of the stalk. 
Wahlenbergia Schrad. (incl. Hedraeanthus Griseb.). Campanulaceae 
(1. 1). 80 sp. chiefly S. temp., where the genus to some extent 
replaces Campanula. 12 sp. are found in Eur. and As. Minor, one of 
which, W. hederacea Rchb. ( Campanula hederacea L.), the ivy- 
leaved bell-flower, occurs in Brit. Fir. like that of Campanula. 
Capsule loculicidal (the chief difference between these two genera). 
Waldsteinia Willd. Rosaceae (in. 6 c). 4 sp. N. temp. 
Wallichia Roxb. Palmae (iv. 6). 3 sp. Himal. to Malaya. 
Washingtonia H. Wendl. Palmae (1. 2). 2 sp. S. Calif., Arizona. 
Included in Pritchardia in Nat. Pfi. 
Washingtonia Winsl. = Sequoia Endl. 
Watsonia Mill. Iridaceae (ill), n sp. Afr., Madag. 
Wedelia Jacq. Compositae (v). 60 sp. trop. and warm temp. 
Weigelia Pers. = Diervilla Tourn. 
Weinmannia Linn. Cunoniaceae. 70 sp. S. Am., Madag., N. Z., 
Austr., Polynes. 
Wellingtonia Lindl. = Sequoia Endl. 
Welwitschia Hook. f. Gnetaceae. 1 sp., W. mirabilis Hook, f., a 
remarkable plant discovered by Welwitsch in Damaraland (W. trop. 
Afr.) and described by Hooker in Trans. Linn . Soc. 1863 (q.v.). 
Specimens may be seen in most of our museums. The plant grows 
for a century or more and has a peculiar habit. The stem is stout, 
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