ASTERACE^. 175 



1. E. microphylla, Nutt. Diffusely branching, Y Z ^A ft. high, the 

 branches fastigiate-corymbose, very leafy throughout: leaves linear, 

 terete, those of the branches % % in. long, deflexed, bearing in their 

 axils very short branchlets hidden by two-ranked closely imbricated shorter 

 ones: involucres % in. high; bracts tomentose-ciliolate : rays about 5, 

 short: achenes subcylindrical, striate, glabrous. Sandy hills and beaches 

 from Bolinas Bay southward; plentiful at San Francisco. Aug Dec. 



2. E. arboresceiis (Gray). Erect, fastigiately branching, 310 ft. 

 high, densely clothed with very narrow-linear sublerete leaves l%3 in. 

 long, 1 line wide: heads in a terminal cymose-corymb, 20 25-flowered: 

 turbinate involucre scarcely 3 lines high; bracts lanceolate, acute: rays 

 seldom present : achenes short, apparently quadrangular, silky-pubescent. 

 At considerable elevations in the mountains of Sonoma, Marin and 

 Contra Costa counties. Sept. Dec. 



10. ISOCOMA, Null. Bather rigid tufted erect suffrutescent plants, 

 with thick slightly succulent toothed leaves, and a corymbose terminal 

 cluster of smallish rayless heads. Bracts of several-flowered involucre 

 coriaceous, closely imbricated, the tips herbaceous but appressed, obtuse 

 or acutish. Corollas permanently yellow; tube slender; limb ventricose, 

 the segments being more or less strongly connivent about the style, the 

 pubescent appendages of which are ovate or somewhat narrower. 

 Achenes short, compressed or subterete, silky-pubescent. Pappus- 

 bristles numerous, unequal, the inner longest and often perceptibly 

 flattened and awn-like, hardly scabrous. 



1. I. vernonioides, Nutt. Glabrous or loosely pubescent, 24 ft. 

 high, erect: leaves oblauceolate, more or less serrate, 12 in. long, often 

 with many fascicled ones in the axils: heads 4 lines high, campanulate; 

 bracts of involucre obtusish: pappus-bristles stout, none very perceptibly 

 flattened. Common shrub of S. Calif., found at Black Point, San 

 Francisco, where it may have been introduced accidentally. 



2. I. arguta. Branches 6 10 in. high, more or less pubescent or 

 hirsute below, glabrous above, leafy throughout; leaves diminishing 

 upwards, the lowest 1 in. long, all broadly oblanceol ate, of coriaceous 

 texture, wiih saliently spreading coarse and acute or mucronale teeth: heads 

 Yz in. high, turbinate, 12 15-flowered: inner pappus-bristles distinctly 

 flattened and tapering very gradually from base to apex. Subsaline 

 plains east of the Vaca Mts., in Solano Co., Jepson. 



11. EUTHAMIA, Cassini. Erect glabrous perennials, very leafy, 

 the branching more or less distinctly corymbose. Leaves nearly linear, 

 entire, pellucid-punctate. Heads small, clustered at the ends of the 

 branches. Involucral bracts firm, imbricated, glutinous. Flowers per- 

 manently yellow; those of the ray about twice as many as those of the 

 disk. Achenes short, turbinate, villous-pubesceut. 



