366 LAUROCERASUS 



Laurocerasus (Tourn.), M. Roem. = Prunus L. p.p. (Ros.). 



Laurophyllus Thunb. (Botryceras BH.). Anacardiaceae (3). iS.Afr. 



Lauras (Tourn.) L. Lauraceae (n). 2, L. ttobilis L. the true laurel 

 or sweet bay, Medit. (1. aromatic, used in condiments, &c., berries 

 in veterinary medicine), and L. canariensis Webb et Berth., Canaries 

 and Madeira. Fls. unisexual by abortion. 



Lautembergia Baill. (Alchorneay.p. BH.). Euph. (A. 11.2). 2 Madag. 



Lauterrjachia Perkins. Monimiaceae. i New Guinea. 



Lavalleopsis Van Tiegh. Olacaceae. 3 W. trop. Afr. 



Lavandula Tourn. ex L. Labiatae (v, q.v. for gen. char.). 20 Medit. 

 to India. From L. veraDC. (lavender) is obtained oil of lavender, 

 by distillation of the fls. ; it is used in painting, and in the manufacture 

 of lavender water. L. Spica Cav. and L. Stoechas L. are also used. 

 The protandr. fls. are visited by bees and form a good source of 

 honey. 



Lavatera L. Malvaceae (2). 20 Medit., Austr., mid-As. L. arborea 

 L., tree-mallow, on rocks on the Brit, coast. 



Lavauxia Spach (Oenothera p.p. BH.}. Onagraceae (2). 8 W. Am. 



Lavender, Lavandula vera DC. &c.; cotton-, Santalina; sea-, Statice. 



Lavenia Sw. = Adenostemma Forst. (Comp. ). 



Laviclia Phil. Compositae (12). i Patagonia. 



Lavigeria Pierre (Jcacina p.p.). Icacinaceae. i Cochinchina. 



Lavoisiera DC. Melastomaceae (i). 50 Brazil. 



Lavradia Veil, ex Vand. Ochnaceae. 6 Brazil. 



Lawia Griff, ex Tul. Tristichaceae. i Ceylon to Bombay Ghats. 

 Thallus of shoot nature, creeping, with endogenous shoots on upper 

 side. 



Lav/sonia L. Lythraceae. i palaeotrop. L. inerniis L. The powdered 

 1. form the cosmetic, henna, used in the East to stain the finger-nails, 

 &c., red. 



Laxmannia R. Br. (Bartlingia F. Muell.). Liliaceae (m). 8 Austr. 



Laxus (Lat.), loose. 



Layia Hook, et Arn. Compositae (5). 14 W. N. Am. Cult. orn. fl. 



Leader, top bud of a monopodial shoot, Abies. 



Lead-tree (W.I.), Leucaena glanca Benth. ; -wort (W.I.), Plumbago. 



Leaf, a thin green expanded organ, borne on the stem at the nodes. 

 The interior of an ordinary 1. is made up of a mass of spongy green 

 tissue (iiiesophylt), covered by an epidermis which contains stoniata 

 leading to the intercellular spaces in the interior, and whose outer 

 wall is covered by a cuticle of waxy or corky nature. The vascular 

 bundles that run through the 1. and hold it outstretched are called 

 the veins or nerves. The 1. shows distinction into a base abutting on 

 the stem and often bearing a pair of green or membranous expansions 

 (stipules), and z.blade or lamina, often with a stalk or petiole between. 

 Such a 1. has an upper or ventral surface, and a lower or dorsal, and 

 is markedly dorsiventral in structure; it places itself horiz. in 

 what is called \tefi.\ed light position. Others (isobi 'lateral, q.v.) have 

 symmetrical structure on both sides, and place themselves with their 

 edges to the light (phy/lodcs (q.v.) also come into this category), and 

 yet others (centric, q.v.) have symmetrical structure all round, and 

 stand with their apices to the light. Many 1. exhibit sleep movements 



