FUKTHER STUDIES OF YUCCAS. 215 



than as an adaptation to their removal bodily from the 

 anther to the stigma as is the case in orchids and asclepiads, 

 where, however, special means of secure attachment to the 

 insect accompany this aggregation of the pollen grains into 

 a large mass. 



As in the other capsular Yuccas, the pedicel of the fer- 

 tilized flower soon becomes erect, and the ovary shortly 

 begins to enlarge and assumes a bright green color. Owing 

 to the injury inflicted in piercing its wall, the part immedi- 

 ately about the puncture does not take a very active part 

 in this growth, and a cross section here shows a decided 

 difference in size between the punctured and unpunctured 

 half cells of the ovary, and, as the enlargement of the 

 capsule continues, a decided pit appears, mostly of a darker 

 green than the surrounding parts. 



H. Whipplei, var. graminifolia, (Wood). (PI. 13, 23). — 

 What I take to be this form, is the common Spanish Bayo- 

 net of San Bernardino, beginning near the foot-hills north 

 of the city and extending up the smaller canons and upon 

 the mountain sides to an elevation of 1000 feet or more, 

 and, in the Cajon Pass, reaching up toward Cajon Station, 

 where the steep ascent of the pass begins. Recent notes 

 from Dr. Yates, of Santa Barbara, show that a plant of 

 the general character of this variety occurs in the mount- 

 ains above that city, in addition to the typical Whipplei; 

 and it appears to pass eastwards from the San Bernardino 

 region, though I am not in possession of detailed informa- 

 tion as to its distribution outside of the limited area between 

 San Bernardino and the foot-hills north of that city. The 

 plants are very abundant around the Arrowhead Springs, 

 where the type of Whipplei does not occur, and I was 

 able to make a rather careful study of them there shortly 

 after the middle of April, when they were just coming into 

 bloom, as well as a month later, when their flowering period 

 was nearly past; and, still later, in company with Mr. S. 

 B. Parish, I had an opportunity to drive over the principal 

 part of the valley covered by this form, at a time when its 



