18 ERYTHEA. 



Phacelia Mohavensis, Gray, P. circinata, Jacq., and P. 

 Davidsoni, Gray. The first species I found abundant at Green 

 Valley; the other two were common in Bear Valley; P. Mohavensis 

 is generally inconspicuous; P. circinata, with its dull white, almost 

 cylindrical corolla, escapes obscurity only because of its long- 

 white filaments; P. Davidsoni has numerous rather large violet 

 flowers, less highly colored than I have seen tlieni at Wilson's Peak. 

 P. Mohavends belongs to the group of Phacelias that has t;;e circle 

 of corolla appendages closely fitting together in the tube so ns to form 

 a sort of false bottom a line or so above the real base where lie five 

 large drops of honey excluded from all but slender tongues. This 

 species, like others of the group, is much frequented by bees. P. 

 circinata has the appendages less compactly arranged but provides 

 considerable honey and receives a fair amount of attention from the 

 bees. P. Davidsoni, like some other Phacelias and Nemophilas, has 

 the appendages at the base arranged in pairs, each pair inclosing a 

 drop of honey. But the amount of honey is small and I have seen 

 the flowers only casually visited by small bees. They remain open 

 at night. In all three species the anthers dehisce extrorsely but 

 curve upward so that visitors are sure to carry away some pollen. 

 The first two species have filaments exserted and the style lengthens 

 later and brings the stigmas to occupy about the position held by the 

 dehiscing anthers. The essential organs of P. Davidsoni are not 

 exserted and mature at about the same time, but I could not see 

 that the anthers ever come into contact witli tlie stigmas. 



Some Mountain Species of Mimulus. 31. luteus was of course 

 common in cienegas and M. pilosus, Wats., along streams; there 

 were several acres abounding in M. moschatus, Dough; and at Bluff 

 Lake, which I twice visited, there was a great abundance of 3L primu- 

 loides, Benth. I also noted two or three plants of 3/. Palmeri, Gray. 

 None of these species secrete much honey. M. moschatus provides a 

 little more than the others, but not so much even as M. ghdinosus, and 

 much less than M. cardinaUs. But they all, with an exception, to 

 be noted later, depend on their guests for pollination, the stigmas 

 being quite above the anthers. The two lips of the stigmas of all 

 this group have the well-known habit of closing on irritation, the 

 edges of the lower lip being particularly sensitive. Some of the 



