1907] Hall. Compositae of Southern California. 145 



Waste places at Los Angeles, where it has been introduced 

 from Mexico. 



GYMNOLOMIA MULTIFLORA (Nutt.) B. & H. A few specimens 

 have been collected at Los Angeles by Dr. Davidson, and near 

 Santa Monica by Dr. Hasse. At neither place has the species 

 reappeared and it can therefore scarcely be admitted to our 

 flora. 3 * Herbaceous branched perennial, 3 to 6 dm. high, with 

 a rough herbage : leaves linear or lanceolate, mostly entire : rays 

 showy, yellow : achenes smooth, without pappus. An extreme 

 form with very narrow revolute leaves and slender stems, segre- 

 gated as G. Nevadensis by A. Nelson, 35 occurs in Southern Ne- 

 vada and reaches the Argus Mts. of Inyo Co., California, where 

 collected by Purpus, no. 5025. 



TRIBE 6. MADIEAE. TARWEED TRIBE. 

 53. MADIA Mol. TARWEED. 



Erect annual and perennial herbs (one Mexican species 

 shrubby), often glanular-viscid and heavy-scented. Leaves al- 

 ternate (at least the upper), entire or serrate. Flowers yellow, 

 opening in the evening and closing before noon of the next day. 

 Involucre angled by the carinate or almost conduplicate bracts, 

 these in 1 series, each completely enfolding its ray-achene with 

 which it is deciduous, and with a free moderately long or short 

 tip. Receptacle flat or convex, its bracts in a single row between 

 ray and disk-flowers and often united into a cup. Rays few to 

 many, pistillate, the ligules 3-lobed. Disk-flowers 1 to many, 

 perfect, but their achenes mostly abortive. Ray-achenes lateral- 

 ly compressed, oblique, with narrow backs, rarely beaked. 

 Pappus, in our species, none. 



Rays short and inconspicuous : receptacle glabrous or nearly so. 

 Disk-flowers 5 to 20. 



Plant stoutish, viscid-glandular : heads clustered : disk-achenes angular 



1. M. sativa. 



Plant slender, moderately glandular: heads scattered: disk-achenei 



flat 2. M. dissitiflora. 



Disk-flower solitary 4. M. exigua. 



Rays showy: receptacle fimbrillate-hirsute 3. M. elegans. 



34 Davidson, Eryth. i. 61 (1893). 

 35Bot. Gaz. xxxvii. 271 (1904). 



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