162 MISSOURI BOTANICAL GARDEN. 
Y. aloifolia, L. Sp. i. (1753), 319; Engelm. Coll. Writ- 
ings, 287; Watson, J. c. 251; Baker, 7. c. 221; Nicholson 
Gard. Dict. 228. — Plates 7 & 44. 
Y. Yucatana, Engelm. Trans. St. L. Acad. iii. (1873), 
37, and reprint 288; Watson, /. c. 251; Baker, 7. c. 221. 
—Plate 45. 
Y. Guatemalensis, Baker, Refugium Botanicum,v.( 1872), 
pl. 313, and Journ. Linn. Soc. J. ¢. 222; Engelmann, /. c. 
289; Watson, 7. c. 251; Nicholson, 7. c. 233. 
Y. Schottii, Engelm. Trans. St. L. Acad. iii. (1873), 46, 
and J. c. 292, 300; Watson, 7. c. 252; Baker, 7. c. 228. 
Y.macrocarpa, Engelm. Bot. Gaz.vi. (1881), 224, andJ.c. 
299 and 300 ; Nicholson, /.c. 234; Baker, Kew Bull. 1892, 8. 
—Plate 46. (Perhaps only the well developed form of the 
preceding). 
Y. valida, Brandegee, Proc. Calif. Acad. (2), ii. (1889), 
208, plate 11; abst. in Garden & Forest, iii. 106. 
Y. Treculeana, Carr. Rev. Hort. vii. (1858 ),280 ; Engelm. 
l.c. 290; Watson, J.c. 252; Baker, J.c. 226; Sargent, 7. c. 
218, and Garden & Forest, i.54 (with figure of habit) ; Prin- 
gle, Garden & Forest, iii. 338; Nicholson, J.c, 234, f. 250. 
—Plates 1 & 47. 
Y. baccata, Torr. Bot. Mex. Bound. (1858), 221; En- 
gelm. /.c. 276, 291, 300 ; Watson, J.c. 252; Baker, /.c. 229; 
Parish, Garden & Forest, iv. 136; Nicholson, 7.c. 229. 
—Plates 2 & 48. 
Y. filifera, Chabaud, Rev. Hort. 1876, 432; Nicholson, 
1. c. 232, fig. 243, 244; Sargent, Gard. & Forest, i. 78 
(with habit figures), and iv. 324 and 396; Baker, Bot. 
Mag. (3), xlvii. pl. 7197. — Y. baccata, var. australis, 
Engelm. Trans. St. L. Acad. iii. (1873), 44, and J. ¢. 
291; Watson, 7. c. 252; Baker, 7. ¢. 229. — An adoption 
of the varietal name, which has priority, would cause the 
plant to be known as Y. australis (Engelm).—Plates 3 & 4. 
(Y. Desmetiana, Baker, Gard. Chron. 1870, 1217, Journ. 
Linn. Soc. J. c. 222, and Kew Bull. 1892, 8, Engelmann, 
.c. 290; and Y. Peacockii, Baker, /. c. 223, and Kew Bull. 
