1848 



LEUC^ENA 



LEUCLENA (probably from Greek, leukos, white, 

 referring to the flowers). Leguminbsx. This genus 

 includes a tree known in southern Florida as the white 

 popinac, a rapid grower, with acacia-like foliage and 

 whitish flowers; it is also cultivated in S. California. 



Trees or shrubs, usually unarmed, evergreen: Ivs. 

 alternate, pinnate, stipellate: fls. usually perfect, in 

 close heads, not papilionaceous, the 5 petals being 

 separate; calyx 5-lobed; stamens 10, not glandular, 

 exserted; ovary stalked and style filiform: pod flat, 

 broad-linear. Species 9 or 10. Mex., Guatemala, Peru, 

 and Pacific Isls. The trees and shrubs of this genus have 

 the habit of Acacia, but belong to the Mimosa tribe. 



glauca, Benth. (Acacia frondbsa, Willd. A. glaiica, 

 Moench. A. leucocephala, Link. Mimosa glauca, Linn.). 

 Spineless, tree reaching 30 ft. or more: pinnae 4-8- 

 paired; Ifts. 10-20 paired, oblong-linear to lanceolate, 

 oblique, glaucous below: heads of fls. globose, to 1J4 

 in. diam., white; petals erect, very narrow, about one- 

 third as long as stamens: pod 5-6 in. long. Trop. 

 Amer., but occurring in Fla. and Texas; naturalized 

 widely in Old World. It is cult, as an ornamental tree, 

 and the young frs. and seeds are said sometimes to be 

 eaten with rice; reported also to be used in certain 

 regions as a forage plant for some animals. 



L. tricMdes, Benth. (Acacia trichodes, WilldJ. Tree-like: pin- 

 nse 2-3 pairs; Ifts. 3-5 pairs, ovate, acute: fl. -heads twin on 

 axillary peduncles. S. Amer. T TT T 



Li. Xl. D. 



LEUCANTHEMUM (white flower). Compdsitse. 

 An old group-name for certain perennial herbs now 

 included in Chrysanthemum. The most familiar species 

 of the group is the common white-weed or "daisy" of 

 the northeastern states, Chrysanthemum Leucanthemum 

 (or Leucanthemum vulgar e of former works). As dis- 

 tinguished from Chrysanthemum, the genus Leucan- 

 themum differs chiefly in unimportant and inconstant 

 characters of the achene. 



LEUCHTENBERGIA (after Prince Leuchtenberg). 

 Cactacese. AGAVE CACTUS. Stems in age forming a 

 trunk 2 in. or more in diam., by the shedding of the 



2139. Leuchtenbergia principis. ( X J^) 



LEUCOJUM 



lower tubercles: tubercles triangular-acuminate, spread- 

 ing, 2-4 in. long, ^-%in. wide, with twisted papery 

 spines: fls. funnelform, widely expanded, borne near 

 the apex of young tubercles: fr. gray, ovate-elliptical, 

 1 in. long, covered with scales and crowned by the per- 

 sistent fl.; seeds dark brown, minutely tuberculate. 

 Only 1 species, closely related to Echinocactus, but of 

 remarkably different form. The plant is readily grown 

 in the manner of Echinocactus and Mamillaria. 



principis, Hook. & Fisch. Fig. 2139 (adapted from 

 Botanical Magazine.) Radial spines 6-8, the central 

 one usually solitary, longer, sometimes 8 in. long: fls. 

 yellow. B.M. 4393. A.G. 11:464. 



KATHARINE BRANDEGEE. 



LEUCOCORYNE (white club, alluding to the sterile 

 anthers). Liliacese. About a dozen small bulbous plants 

 of Chile, allied to Milla and Brodisea, half-hardy in 

 England, rarely planted here; they probably require 

 the treatment given ixias. Plants scapose, with radical 

 Ivs., and tunicated bulbs or corms: fls. few, in terminal 

 bracted umbels; perianth with 6 nearly or quite equal 

 spreading oval-oblong or narrow lobes; stamens 6, of 

 which 3 are perfect and the others reduced to stam- 

 inodia: caps, membranaceous, 3-grooved, dehiscent. 

 The species known to cult, are: L. iximdes, Lindl. One 

 foot: Ivs. about same length: fls. 4-6, white or pale 

 blue. B.M. 2382 (as Brodisea iximdes). B.R. 1293 (as 

 L. odorata) . L. alliacea, Lindl. Six to 12 in. : Ivs. very 

 narrow, 6-8 in. long: fls. pale lilac, %in. long. 



LEUCOCRINUM (Greek, white lily}. Liliacese. 

 WHITE MOUNTAIN LILY. SAND LILY of Colorado. A 

 bulbous plant growing a few inches high, with narrow 

 foliage and clusters of pure white fragrant flowers borne 

 just above the gound in early spring. 



The fls. are funnel-shaped, having a slender tube 2-4 

 in. long, the greater part of which is below the surface, 

 and 6 lobes, each %-lJ^ in. long, borne in clusters of 

 4 to many fls., and maintaining a succession for several 

 weeks. They should be desirable for edging walks and 

 bulb beds. They have a deep-seated rhizome and fleshy 

 roots. The bulbs are procurable from Colo, and Calif., 

 either as collected or nursery-grown stock. The genus 

 has a single species. It belongs to an anomalous group, 

 characterized by almost total lack of st. and fls. solitary 

 or clustered among the radical Ivs. From the other 

 members of this group it is distinguished by the Ivs. 

 not 2-ranked, and an indefinite number of ovules in 

 each locule. Perianth-segms. narrowly lanceolate, 

 persistent; stamens 6; style persistent, slightly 3-lobed. 



montanum, Nutt. Lvs. 8-12 or more, flat, rather 

 thick, 4-8 in. long, 1-3 lines wide: pedicels J^-IH in. 

 long. Sandy soils and in mountain valleys, W. Neb. 

 and S. Dak. to Colo., Ore., and N. Calif. 



J. H. COWEN. 



LEUCOJUM (name discussed below). Also written 

 Leucoium. Amaryllidacese. SNOWFLAKE. Hardy bul- 

 bous plants growing a foot or less high and bearing 

 dainty, nodding, 6-parted flowers, which are white, 

 tipped with green, yellow, or a tinge of red. 



Perianth-tube none ; segms. uniform, ovate or oblong, 

 spreading; stamens epigynous; filaments filiform, 

 shorter than the linear-oblong basifixed anthers; ovary 

 3-celled; ovules many in a cell, superposed; styles 

 filiform or strumose near the apex; stigma minute, 

 capitate: fr. finally dehiscing loculicidally into 3 valves 

 from the top; seeds subglobose; testa usually black: 

 rootstock a bulb, with membranous tunics : Ivs. slender 

 or lorate: fls. 1 or several in an umbel, white, tinged 

 with red or green; spathe- valves usually single. Eight 

 species, natives of Eu. and the Medit. region, 6 of which 

 are cult. The name Leucojum was given by Linnams, 

 but he did not explain the application. The old Greek 

 name, Leucoion, was given by Theophrastus to a plant 

 now supposed to be a crucifer, like some stock or wall- 



