128 MISSOURI BOTANICAL GARDEN. 
barium. The leaves are representative of Y. brevifolia, and the inflor- 
escence, apparently, of Y. Schottii. 
Plate 58.— Yucca brevifolia, toward the Santa Cruz river, to the 
northeast of Nogales, Ariz. 
Plate 59.— Yucca brevifolia. Tree about 2 meters high, with panicle 
axis from preceding year, near Nogales, Arizona. 
Plate 60.— Yucca australis. The original sheet of Thurber’s collection 
from Parras, Mex., in the Torrey herbarium. 
Plate 61.— Yucca australis. —1, In fruit, at Parras, Mex.; 2, In 
flower, near Topo Chico, Monterey, Mex. 
Plate 62. — Yucca valida. Old hedgerows, near Durango, Mex. 
Plate 63. — Yucca valida, near Gutierrez, Mex. 
Plate 64. — Yucca valida. — 1, Near Gutierrez, Mex., with Opuntia leu- 
cotricha in the foreground; 2, Near Camacho, Mex. 
Plate 65. — Yucca valida, near Gutierrez, Mex. — The lower part of the 
trunk, some years before, had been decorticated without killing the tree, 
over the lower part of which a new bark has formed. 
Plate 66.— Yucca valida. Flowers, somewhat reduced, from near 
Gutierrez, Mex. 
Plate 67. — Yucca valida. Type sheet, from San Gregorio, L. Cal., in 
the Brandegee herbarium. 
Plate 68. — Yucca baccata, in the Grand Cajion, Ariz. — The fruit is 20 
cm. long. 
Plate 69.— Yucca baccata. Fruit of the preceding, natural size (fore- 
shortened), showing the basal disk. — Photographed by P. T. Barnes. 
Plate 70.— Yucca macrocarpa. Flowering plant, near Sierre Blanca, 
Texas. 
Plate 71.— Yucca macrocarpa. Fruiting plants, in the type region, in 
the great bend of the Rio Grande. 
Plate 72.— Yucca Mohavensis, at Drake, Ariz. — The right-hand figure 
has a very characteristic plant of Mowquiera in the foreground. 
Plate 73.— Samuela Faxoniana, near Sierra Blanca, Tex. — Character- 
istic round-headed trees. 
Plate 74. — Samuela Faxoniana, a partly sterile fruiting plant, with 
persistent bracts, and a plant beginning to bloom, near Sierra Blanca, 
‘Texas. 
Plate 75. — Samuela Faxoniana. Leaf tips and partly grown fruit 
(showing the fleshy base and short split tube of the perianth), from 
Sierra Blanca, Tex., natural size. 
Plate 76.— Samuela Carnerosana, in the Carneros Pass, Mex. Full 
blown trees, and the foliage head of a young plant. 
Plate 77. — Samuela Carnerosana. Flowering and fruiting trees in the 
Carneros Pass, Mex.—The partly sterile inflorescence is conspicuous 
even in fruit, because of its persistent large bracts. 
Plate 78.— Samuela Carnerosana in the Carneros Pass, Mex. —1, 
Fruiting tree; 2, Early stage of flowering, showing the large bracts and 
the buds in which the panicle branches at first end. 
