-woody, and covered with the remains of 

 decayed mammillae, while the upper bears 

 Ion? perfect mammilla?, and looks very much 

 like an artichoke. The flowers, which are 

 produced at the top of the plant among the 

 younser mammillae, bear a great resem- 

 blance to those of Cereus, but are distin- 

 guished by the tube of their perianth being 

 more cylindrical, and having the stamens 

 growing to its inside as far as the bottom 

 of the petals, after which they converge 

 and meet in the centre, closing up the 

 mouth of the tube. [A. SJ 



LEITO. In Greek compounds = white : 

 thus leucocarpus is white-fruited; hypo- 

 leuca, white beneath, &c. 



LETJCOBRYTTM. A genus of acrocarpous 

 mosses, having the white hue of Sphagnum, 

 and agreeing with Dicranum in the capsule 

 and peristome, but distinguished by the 

 peculiar structure of the external leaf-cells. 

 These are disposed in two or more strata, 

 and are large and rectangular, void of chlo- 

 rophyll, and communicating with each other 

 by means of circular apertures. The chlo- 

 rophyll cells are imbedded in the centre of 

 the leaves. Our only species, L. glaucum, 

 occurs in the same sort of situations as 

 Sphagnum, forminglarge tufts, which, how- 

 ever, seldom fructify ; it agrees in the ge- 

 neral appearance of the foliage with Leuco- 

 phaves and Octoblepharum, and occurs in 

 America and in the southern hemisphere. 

 There are several exotic species. CM. J. B.] 



LEUCOCORYNE. A genus of Chilian 

 herbs of t be order Liliacece. They have fleshy 

 roots, linear leaves, and umbels of white or 

 blue flowers supported on scapes. These 

 flowers have a hypocrateriform perianth ; 

 three fertile stamens inserted in the middle 

 of the tube, and three sterile fleshy ones 

 seated in the throat; and a terminal style 

 articulated with a sessile ovary, and having 

 a simple stigma. [T. MJ 



LEUCOJUM. A genus of European Ama- 

 ryllidacece comprising a few very pretty 

 bulbous plants called Snowflakes. They 

 bear considerable general resemblance to 

 snowdrops, but are larger, and the six 

 perianth segments are nearly equal. They 

 have sheathing erect linear lorate leaves, 

 and hollow angular scapes, the flowers being 

 campanulate, and white tipped with green. 

 The six stamens are inserted on an epigy- 

 nous disk, and their anthers open by a ter- 

 minal pore, and also by a lateral exterior 

 slit, not extending to the base. Erinosma 

 and Acis, represented by L. vemitm and 

 L. autumnalis, were formerly included. The 

 common species is L. astivum. [T. M.] 



LETJCOLiENA. A genus of umbellifers, 

 having the border of the calyx five-lobed ; 

 and the fruit compressed, each half with 

 seven to nine narrow ribs. The species are 

 natives of New Holland, generally of small 

 size, and usually covered with fine down. 

 The name indicates the white appearance of 

 the bracts. [G. D.] 



LEITCOMERIS. A Himalayan shrub or 

 thick-stemmed erect herb, with long leaves 



1 hoary underneath, and numerous flower- 

 heads in a terminal corymb, forming a 

 genus of Compositce, scarcely differing 

 from the American Gochnatia. 



LEUCOPHAE. A genus proposed by Webb 

 for the shrubby species of Sideritis from 

 the Canary Islands, but which have gene- 

 rally been maintained as a section only of 

 Sideritis, under the older name of Marru- 

 biastrum of Mcench. 



LEUCOPOGON. A large genus of Epacri- 

 daceai, distinguished by having a five-lobed 

 calyx, with two or three bracts at the base; 

 a funnel-shaped corolla with five spreading 

 lobes ; five anthers on very short filaments 

 which are included within the corolla; and 

 a style thickened at the base, bearing a 

 capitate stigma. Thefruit is either a berry 

 or a dry capsule. The flowers are white in 

 terminal or axillary spikes, and the leaves 

 are lanceolate slightly toothed or hairy at 

 the margin. They are handsome shrubs 

 found in most parts of Australia, Tasmania, 

 and New Zealand. [R. H.] 



LEUCOPSIDIUM. A genus of Compositce 

 established by De Candolle in the tribe 

 Anthemidece, for some North American 

 plants since reduced to Egletis. L. arkan- 

 sanum is sometimes met with in gardens. 



LEUCORCHIS. A genus of Java orchids 

 consisting of terrestrial, perhaps leafless, 

 herbs, having scapes bearing racemes of 

 whitish flowers. They belong to the Are- 

 thusew, and have the leaflets of the perianth 

 connate at the base, the lateral sepals form- 

 ing an emarginate lower and the dorsal sepal 

 with the petals a trifid upper lip, while the 

 labellum is roundish undivided and spread- 

 ing, articulate with the column. [T. M.] 



LEUCOSMIA. A genus of Aquilariacea?, 

 consisting of a shrub, native of the Friendly 

 Isles. It has opposite entire leaves, and 

 terminal heads of flowers, surrounded by a 

 deciduous involucre. The perianth is tubu- 

 lar, coloured, with five petaloid scales in its 

 throat; stamens ten, in two rows; ovary 

 girt round at the base by a short sheath, 

 with a solitary ovule in each of its two com- 

 partments ; fruit fleshy. [M. T. M.] 



LEUCOSPERMUM. A proteaceous genus 

 consisting of shrubs or small trees, natives 

 of South and South-eastern Africa, reach- 

 ing to the tropic. They are known by hav- 

 ing a four-cleft silky calyx, the concave 

 segments of which occasionally cohere, 

 and each bear a sessile anther ; style fili- 

 form, with a smooth stigma. The seed- 

 vessel is one-celled, and contains a single 

 smooth wingless seed. The involucre is 

 imbricated, and the yellow flowers are 

 borne in terminal globose heads ; leaves 

 sessile, of a leathery texture, often toothed 

 at the apex, and generally covered with 

 silky hairs. [R. H.] 



LEECOSTEGIA. Acrophorus. 



LEUCOSYKE. The name of a small 

 tree, native of Java, forming a genus of 

 Moracece, The leaves are stalked, ovate, 

 sharply pointed, white and hoary on the j 



