186 MISSOURI BOTANICAL GARDEN. 



from about Monterey into the peninsula. It therefore 

 connects the territory of glauca, which is pollinated by 

 Pronuba yuccasetta, with that of two Calif ornian species 

 pollinated by very distinct moths. No observations appear 

 to have been made heretofore on its pollination, nor has 

 any Pronuba been taken on its flowers, but Professor Riley 

 predicts the probable discovery of a distinct species for it.* 

 In the valley between San Bernardino and Colton, Cali- 

 fornia, baccafa is found in some abundance, but no Pronuba 

 Avas seen in any of the specimens examined about the mid- 

 dle of April, when they were in full bloom, and they are 

 said never or very rarely to fruit there, by Mr. S. B. Parish, 

 in whose company my observations on this occasion were 

 made. 



About Banning and Cabazon, on the western edge of the 

 Colorado desert, where the plants are more abundant and 

 of larger size, often with a trunk five or six feet high, 

 they are more generally fertile, and a quantity of fruits of 

 the preceding year were collected from the crowns of 

 leaves into which they had fallen on maturity, and where 

 they had been protected from rodents. Most of these 

 fruits were strongly constricted about the middle, and per- 

 forated in places, where the larvae of a Pronuba had 

 escaped. The plants were not blooming very freely this 

 year, but several specimens of a white Pronuba were taken 

 resting in the flowers, and though numerous panicles had 

 bloomed without setting any fruit, others were sparingly, 

 and still others abundantly, fertilized, and the ovaries of 

 the fertilized flowers showed unmistakable constrictions or 

 indentations indicative of the opposition of Pronuba; still, 

 the moths were not sufficiently numerous to render night 

 observations on their work possible. 



A number of blooming plants of baccata were examined 

 about the first of May on the mesas back of San Diego, 

 where, notwithstanding the more southern latitude, the 



* Proc. Biol. Soc. Washington, vii. 96. 



