THE YUCCEAE. 127 



Plate 37. Yucca rupicola? Aberrant sheet of Wright, no. 1909, in 

 the Torrey herbarium. 



Plate 38. Yucca rupicola, the more normal Gray herbarium sheet 

 of Wright, no. 1909. 



Plate 39. Yucca rupicola. 1, Flowering plant, on limestone hills a 

 few miles west of Fort Worth, Texas; 2, Flowers, slightly reduced, of 

 plant cultivated by Mr. J. Reverchon, from same locality. 



Plate 40. Yucca rostrata, at Peyotes, Mex. Flowering plants. 



Plate 41. Yucca rostrata, at Peyotes, Mex. The upper figure show- 

 ing the lozenge-shaped leaf-scars. 



Plate 42. Yucca rostrata, at Peyotes, Mex. fruiting plants. The 

 foreground is occupied by Agave heteracantha. 



Plate 43. Yucca gloriosa, in the sand dunes of Tybee Island, Ga. 



Plate 44. Yucca gloriosa, Tybee Island, Ga. 1, Smooth-barked 

 trunk, with roots, exposed by the shifting of the sand; 2, With partly 

 grown fruit, photographed in May. 



Plate 45. Yucca gloriosa minor, cultivated in the Missouri Botanical 

 Garden. At the left are Y. aloifolia, with narrow leaves, and Y. elephan- 

 tipes, with broad more flexible leaves. 



Plate 46. 1, Yucca gloriosa superba, fruit and cross section, natural 

 size, cultivated in Washington, D. C. (Schott); 2, Yucca recurvifolia, 

 fruit, natural size, cultivated at Bluffton, S. C. (Mellichamp, in 1901). 



Plate 47. 1, Yucca recurvifolia (2 m. high), cultivated in the National 

 Cemetery, Vicksburg, Miss. ; 2, Yucca flexilis Hildrethi, escaping, at St. 

 Augustine, Fla., photographed in May. 



Plate 48. " Yucca De Smetiana," cultivated in the Yucca tower 

 of the Missouri Botanical Garden. 



Plate 49. Yucca aloifolia. 1, Associated with Ipomoea Pes-Capreae, 

 on the dunes of South Beach, St. Augustine, Fla. ; 2, Overgrown with 

 SmilaXf on the dunes of Tybee Island, Ga. 



Plate 50. Yucca aloifolia Menandi, type plant cultivated at the Mis- 

 souri Botanical Garden. Photographed by P. T. Barnes. 



Plate 51. Yucca elephantipes. 1, A large tree, at El Florido, Guate- 

 mala; 2, The dilated base of a tree, at Chiuautla, Guatemala. 



Plate 52. Yucca Treculeana. 1, In flower, cultivated at C. P. Diaz, 

 Mex. ; 2, In fruit, near Peyotes, Mex. 



Plate 53. Yucca Treculeana canaliculata. Cultivated in the Alamo 

 Plaza, San Antonio, Tex. 



Plate 54. Yucca Treculeana canaliculata. Cultivated at the Mis- 

 souri Botanical Garden. Photographed by P. T. Barnes. 



Plate 55. Yucca Schottii, west of Nogales, Ariz., photographed in 

 August : the second figure, from near the boundary monument in the 

 Sierra del Pajarito. 



Plate 56. Yucca Schottii Jaliscensis. " Izote ", in the suburbs of 

 Zapotlan, Mexico, photographed in September. 



Plate 57. Yucca brevifolia. The mixed type-sheet, in the Torrey her- 



