582 FLOWERS. OF GARDEN AND GREENHOUSE 
inches long, concave, margins and underside prickly. Flowers red, about 
14 inch long, in dense raceme 6 inches long. Introduced from the 
Cape, 1800. 
A. STRIATULA (striped). Stem 3 feet high, twiggy. Leaves slender, 
spreading, 6 to 12 inches long, slightly channeled, marginal prickles 
broadly triangular. Flowers yellow, 1 to 14 inch long, in rather dense 
raceme 3 to 6 inches long. Introduced from the Cape, 1821. 
A. soccoTRINA (Socotrine). Stem often forked, 3 to 5 feet high. 
Leaves, thirty to forty in a dense rosette; slightly channeled, somewhat 
glaucous, sometimes spotted, 14 to 2 feet long; marginal prickles pale 
and small. Flowers reddish, 14 inch long, in dense raceme 1 foot long. 
A. TRICOLOR (three-coloured). Stem short. Leaves twelve to 
sixteen in a close rosette; lance-shaped, somewhat swollen on upper 
side, lower surfacé rounded, spots numerous, marginal prickles crowded 
and spreading. Flowers fleshy, coral-red, in a loose raceme ; scape purple. 
Introduced from South Africa, 1875. 
A. VARIEGATA (variegated). Leaves lance-shaped, 4 or 5 inches long, 
face concave, back keeled, spotted with grey on both sides, margin 
creamy white, with small teeth. Flowers reddish, 1} inch long, i in loose 
raceme 3 or 4 inches long. 
A. VERA (true). Stem about 2 feet high. Leaves sword-shaped, 
dense, channeled above, marginal prickles triangular, horny. Flowers 
yellow, in a dense raceme 6 to 12 inches long. 
The cultural directions given under the head of 
Gasterva apply equally to Aloes and other succulents of 
allied genera. 
Description of Aloe arborescens, the Tree Aloe. The raceme and 
Plate 271. flowers are shown of the natural dimensions, but the plant 
itself has been reduced to one-quarter of the real size, and the stem has 
been omitted altogether, in order to give as large a figure of the leaves as 
possible. Fig. 1 is a section through a somewhat enlarged flower. 
Cultivation. 
YUCCAS 
Natural Order Lintacem Genus Yucca 
Yucca (the native Peruvian name). <A genus of about twenty species of 
woody-stemmed plants, with narrow lance-shaped leaves clustered at the 
summit of the trunk, which is sometimes dwarf, sometimes tall, branched 
and tree-like. These leaves are long, usually thick and rigid, ending in 
