February i<>, [903 3 



shown by collections from San Luis Obispo and San Diego by 

 Jones. 



Piper in his Flora of Washington recognizes that the Wash- 

 ington plants are the same as at least some of those found around 

 San Francisco Bay, as he makes T. Greenei a synonym of T. 

 Hallii. 



A reading of the descriptions of the leaflets of the different 

 species proposed, indicates a great similarity. The original de- 

 scription of T. bijidum Gray, says "leaflets linear-cuneate, lateral 

 ones rarely dentate, bifid or incised at the apex with a mucronate 

 point between the lobes." 



The accompanying illustration was prepared from leaflets 

 taken from different specimens in an attempt to show that there 

 is a gradual transition from leaflets which are simply retuse or 

 emarginate to deeply incised ones. We could show the same 

 gradations of variation in the calyx, the most striking being two 

 specimens with long calyx teeth, one from Osage Canyon, Ara- 

 quipa Hills, Solano county, California, May 2 to 6, 1891, Jep- 

 son, the other from Vanden, Solano county, May 7, 1907, Ken- 

 nedy. But in this same locality we find plants showing the 

 transition stages of both leaflets and calyx teeth. 



If we attempt to separate the northern plant and call it T. 

 Hallii, we find on the same sheet (E. Hall, 97, Oregon, 1871, 

 Engelmann Herbarium, Missouri Botanical Garden, accession 

 no. 21 154, named T. gracilentum) obovate leaflets with a retuse 

 apex, and linear leaflets with a notch one-quarter their length. 



Plants from around Los Gatos, Santa Clara county, Califor- 

 nia, with identically the same shape of vexillum, wings, keel, 

 and length of calyx teeth, when they have plenty of room are 

 robust, with simply emarginate mucronate leaves, while if 

 crowded, a hundred plants within a square foot of ground, they are 

 small, with deeply incised leaves. These latter plants were also 

 decidedly more pubescent and hirsute. The entire peduncle is 

 pubescent, and the pubescence also extends to the leaves. The 

 reduction in the amount of leaf surface in the first place, and 

 the increased pubescence in the second, seems to us to be due to 

 an attempt on the part of the plant to adapt itself to conditions 



