McGregor : Two new spermatophytes from California 607 



lower rarely remotely and obscurely dentate, 4-9 cm. long, re- 

 duced upward : heads terminating numerous branches, many- 

 flowered ; involucre 13-15 mm. high, hemispherical; bracts in 

 about two series, becoming somewhat glabrate, the Inner linear- 

 lanceolate, acuminate, the outer similar but narrower and half as 

 long; calyculate scales few: corolla white or pinkish ; ligule ro 



tube 6 mm. long, puberulent on its upper third : 

 achenes (not matured) broadly obovate-oblong, apparently 10- 

 ribbed, the slightly contracted summit bearing a well-expanded 

 crown whose rim is merely crenulate ; pappus-bristles snow-white, 

 all falling together. 



Carmel Valley, Monterey Co., California ; by the roadside. 

 Collected by the writer {iio. iS75\ J^'y l* 1906. 



mm. long ; 



y 1 



y 6 



Figure 2. OxytJuca Abramni McGregor ; a, leaf, natural size ; b^ bract, from 

 free side, X 6; r, Eract, from deflected side, X ^ » ^> involucre, showing ribs, awns, 

 and flowers, X 5 J ^» flower laid open to show parts, X 8. 



This plant belongs to the M. saxatilis group, which includes 

 M, saxatilis (Nutt.) Torn & Gray, M. temiifolia (Nutt.) Torn & 

 Gray, M, altissima Greene, and M, iinplicata Eastw. 



On the whole these species are very closely related and form 

 a very natural group, differing from the other members of the 

 genus in the following characters : tall, leafy perennials ; involu- 

 cral scales in two appressed equal series ; receptacle with no 

 bristles ; no persistent pappus-bristles. It would seem that they 

 might well constitute at least a valid subgenus. 



The characters of the flower and those of the achene of the 

 different species are much alike, the important differences being 



