1900 SUPPLEMENT—RECENT INTRODUCTIONS, &C, 487 
LETTUCE, WATER. Sce Pistia Stratiotes. 
LEUCADENDRON. Syns. Conocarpus (of Adanson), 
Protea (of Linneus). To the species described on p. 255, 
Vol. II., the following should be added: 
L. ae (plume-like). f. yellow, in sessile heads ; 
males 4in. long; females as large as a small Apple, sub-globose. 
July. 7. sessile, linear-lanceolate, obtuse, narrowed at base, 
twisted, sin. to lin. long. Branches fastigiate. A. 4ft. 1774. 
LEUCADENDRON (of Linnens). A synonym of 
Protea (which see). 
LEUCENA GLAUCA. 
Acacia glauca (which see). 
LEUCANIA UNIPUNCTA. See Army Worm. 
LEUCANTHEMUM. Included under Chrysanthe- 
mum (which see). 
LEUCERIA (from lewkeres, white; some species are 
clothed with white wool). Syn. Leucheria. Including 
Chabrea and Lasiorrhiza. Orb. Composite. A genus 
embracing about twenty-five species of greenhouse, 
annual or perennial herbs, allied to Chaptalia, natives 
of extra-tropical South America or the Andes. Flower- 
heads purple, pink, blue, or white, homogamous. Leaves 
sometimes all radical, sometimes alternate on the stems, 
entire, incised, or pinnately dissected. L. rwncinata is 
the only species calling for description here. For culture, 
see Annuals. 
L. runcinata (runcinate). /.-heads white, fragrant, often 
changing to pink. June. J. oblong, sessile, sub-amplexicaul, 
more or less deeply pinnatifid, the segments rather distant. 
Flowering branches somewhat paniculate. Stems weak, lft. 
to lift. high. Andes, 1844. Syns. Chabrea rosea, C. runcinata 
(B. M. 4116), Lasiorrhiza rosea, L. runcinata. 
LEUCHERIA. See Leuceria. 
The correct name of 
Fic. 515. LEUCHTENBERGIA PRINCIPIS. 
LEUCHTENBERGIA. This genns affords one of 
the most remarkable instances of plant mimicry that occur 
in the Cactus order. Remove the flower from DL. principis, 
and very few people indeed would think of calling it a 
Cactus, but would probably consider it a short-leaved 
Yueea. In habit, in form, in leaf, and in texture, it more 
resembles a Yucca or an Agaye than anything else, and 
until it flowered it was considered such by the Kew 
authorities. The leayes, or rather tubercles, are sometimes 
longer and slenderer than in Fig. 515. The nearest 
approach to this plant is Mammillaria longimamma, 
in which the tubercles are lin, or more long, finger- 
Leuchtenbergia—continued. 
shaped, and crowned with a few hair-like spines. But the 
Leuchtenbergia bears its flowers on the ends of the 
tubercles, and not from the avxils, as in all others. This 
peculiarity leads one to infer that tubercles are modified 
branches, the spines representing the leaves. Some species 
of Mammillaria and Echinocactus develop young plants 
from the tops of their tubercles; and this also points to 
the probability that the latter are branches. In 
Leuchtenbergia, the tubercles fall away as the plant 
increases in height, leaving a bare, woody stem similar 
to that of a Yucca. 
The Leuchtenbergia has always been difficult to keep in 
health. It thrives best when kept in a warm, sunny 
house during winter, and in an exposed, airy, warm 
position under a frame during summer. It may be watered 
regularly whilst growing—that is, from April to September 
—and kept quite dry all winter. The soil shonld be well- 
drained loam, and the roots should have plenty of room. 
A specimen may be seen in the Kew Collection. 
Propagation may be effected from seeds, or by 
remoying the head from an old plant, putting the former 
in sand, and placing it under a bell glass to root, 
watering it only abont once a week till roots are 
formed. The old stem should be kept dry for about 
two months, and then watered and placed in a sunny, 
moist position, where it can be syringed once a day. 
A shelf in a stove is the best position for it. Here it 
will form young buds in the axils of the withered 
tubercles, and on the edges of the persistent parts of 
the tubercles themselves. They first appear in the form 
of tiny tufts of yellowish down, and gradually develop 
till the first leaf-like tubercle appears. When large 
enough, the buds may be removed and planted in small 
pots to root. If an old plant is dealt with in this way 
in April, a batch of young ones should be developed 
and rooted by October. Grafting does not appear to haye 
ever been tried for this plant. When sick, the plant 
should be carefully washed, and all decayed parts cut 
away; it may then be planted in very sandy loam, and 
kept under a bell glass till rooted. 
LEUCOCEPHALA. A synonym of Eriocaulon 
(which see). 
LEUCOCORYNE. To the species described on 
p. 256, Vol. II., the following should be added; 
L. purpurea (purple). jl. lavender and crimson-maroon, two to 
eight produced on each scape. J. Grass-like, as in other species. 
Chili, 1894. Hardy. 
LEUCOHYLE. A synonym of Trichopilia (which 
see). 
LEUCOIUM. J. G. Baker includes Acis (which see) 
under this genus. Perianth broadly campanulate ; tube 
none ; segments uniform, ovate or oblong, connate towards 
the base; stamens epigynous; filaments filiform, shorter 
than the basifixed anthers. Though nominally hardy, yet 
all the species are not good outdoor subjects. L. tricho- 
phyllum, for instance, does best when inserted in pots in 
a greenhouse, or else in a cold frame, using a very sandy 
compost. For the rockery, L. autwmnale is better suited 
than for the border, and this also should be planted in a 
sandy compost. 
To the species described on p. 257, Vol. II., the following 
shonld be added: 
L. carpathicum (Carpathian). A form of ZL. vernum. 
L. hyemale (wintry).* (/., perianth white, the segments oblong, 
imbricated, sin. long, tinged green at back, the three inner 
shorter and more obtuse than the outer; peduncle slender, 
erect, one- or two-flowered. ete S i. two to four, con- 
temporary with the flowers, narrow-linear, 6in. to 12in. long. 
Bulb brown-tunicated. Maritime Alps. (B. M. 6711; Fl. 
Ment. 21.) Syns. L. nicwense, Acis hyematlis. 
L. niczense (Nicean). A synonym of L. hyemale. 
L. pulchellum’ is the correct name of J. Hernandezii, which is 
accorded specific rank by Baker; it differs from L. aestivum 
in its smaller flowers (produced a fortnight earlier) and narrower 
leaves. 
L. roseum (rosy). jl. usually solitary; perianth limb rose-red, 
4in. long ; segments oblanceolate ; peduncle slender, 2in. to 4in. 
long. September and October. J. filiform, produced after the 
flower. Bulb jin. to 4in. in diameter. Corsica, 1820. Syn. 
Acis rosea (G. B. F. G., t. 297). 
L. r. longifolium (long-leaved). 
more floriferous, 1886. 
a. larger. JU. longer, Plant 
