LILIACEA. 369 
Tribe V. CONVALLARIA. 
Convallaria, Benth. et Hook. Gen. Plant. iii. p. 752. 
Four monotypic genera constitute this tribe, which is confined to the northern 
hemisphere and to the Old World, except the widely dispersed Convallaria majalis. 
Tribe VI. ASPIDISTREZ. 
Aspidistree, Benth. et Hook. Gen. Plant. iil. p. 782. 
Also only four genera and about ten species, inhabiting the mountains of North 
India and Burma, and China and Japan. 
Tribe VII. HEMEROCALLEA. 
Hemerocallee, Benth. et Hook. Gen. Plant. iii. p. 752. 
Of this tribe there are six genera, numbering together about thirty-five species. 
About half of them belong to the genus Kniphofia, which is restricted to Africa, chiefly 
extratropical, and Madagascar; one other genus is endemic in Africa, one in New 
Zealand, one in Australia, one in China and Japan, and Hemerocallis itself is repre- 
sented in Europe and Asia. 
Tribe VIII. ALOINE. 
Aloinee, Benth. et Hook. Gen. Plant. iii. p. 753. 
This is essentially an African tribe, the few species found outside of that country 
having, probably, been originally introduced. Five genera are maintained, and they 
number 200 species. 
Tribe IX. DRACENE AL. 
Dracenee, Benth. et Hook. Gen. Plant. iii. p. 753. 
There are nine genera and about 100 species of this tribe, and they are widely 
distributed in warm and temperate countries, though absent from Europe, and very 
sparsely scattered in Africa and Asia. Five of the genera are confined to Central and 
North America. 
3. YUCCA. 
Yucca, Linn. Gen. Plant. n. 429; Benth. et Hook. Gen. Plant. ii. p. 778. 
This genus has its greatest concentration in Mexico, a few species extending south- 
ward into Central America, and four or five occurring in the Southern States of North 
America. The number of distinct species is uncertain; Engelmann, in 1873, defined 
twelve, and Baker, in 1881, twenty-one, several of which, however, are only known from 
cultivated plants. 
1. Yucea aloifolia, Linn. Sp. Pl. ed. 1, p. 319; Engelm. in Trans. Acad. St. 
BIOL. CENTR.-AMER., Bot. Vol. III., February 1884. 36 
