248 University of California Publications in Botany. [VOL. 3 



separate them. Uropappus is distinguished from Eumicroseris 

 by its erect heads on more or less swollen peduncles and by its 

 pappus-paleae being cleft at the tip. Scorzonella has the nodding 

 heads (in anthesis) of Eumicroseris and paleae either entire, as 

 in that section, or cleft, as in Uropappus, but is best marked by 

 its enduring root, imbricated involucre, and long ligules. The 

 achenes have swollen tubercle-like bases only in Eumicroseris. 

 The pappus-paleae are usually 5 in Eumicroseris, but 10 in its 

 type species ; always 5 in Uropappus ; usually 10 but occasionally 



5 in Scorzonella. 



A. Annuals: pappus-paleae mostly short, abruptly or gradually passing 

 into a slender awn: heads nodding in the bud; peduncles not en- 

 larged at summit. ( Eumicroseris.) 



Paleae reduced to a triangular base or obsolete 1. M. elegans. 



Paleae conspicuous, 2 mm. or more long. 



Awns longer than the paleae 2. M. Douglasii 



Awns much shorter than the ovate paleae 3. M. platycarpha. 



B. Annuals: pappus-paleae elongated, flat, cleft at tip; the awn pro- 

 ceeding from the cleft: heads erect and peduncles enlarged at 

 summit. ( Uropappus.) 



Achenes attenuate to a beak: pappus clear white or brownish 



4. M. linearifolia. 



Achenes truncate: pappus dull brown or sordid 5. M. Lindleyi. 



C. Perennial with fusiform taproot. ( Scorzonella.) 



Involucre imbricated: ligules elongated: pappus-paleae 10. ...6. M. montana. 



1. M. elegans Greene, in Gray, Syn. Fl. i. pt. 2, 419 (1884). 



Scape slender, often decumbent at base, a few cm. to 1 or even 

 3 dm. high : leaves variable : involucre 6 to 8 mm. high : achenes 2 

 to 2.5 mm. long, gradually tapering from the broad truncate sum- 

 mit to the base: pappus brown or rufescent; the paleae ovate- 

 deltoid, 1 mm. or less long ; the slender awn about 4 mm. long. 



San Diego, Brandegee, distr. Baker, PL Pacif. Coast, Sperm. 



6 Ferns, no. 820 (indicated by Dr. Greene as a new species) ; 

 Santa Monica, 1891, Hasse (in Hb. Davidson, labeled M. aphan- 

 tocarpha tenella, but certainly M. elegans) ; Santa Cruz Island. 

 Apr., 1888, Brandegee; San Miguel Island, 1903, Beck; middle 

 California. 



