146 University of California Publications in Botany. [ VOL - 3 



1. M. sativa Molina, Chile ed. 1., 136 (1782). CHILE TAR- 

 WEED. 



Usually robust, 3 to 6 dm. high: herbage pubescent with 

 slender hairs and beset with pedicillate very viscid glands, ill- 

 scented: leaves from broadly lanceolate to linear: heads short- 

 peduncled or sessile, disposed in the upper axils and in small 

 clusters terminating short branches : involucre 8 to 12 mm. high ; 

 its bracts hispid: ray-flowers 5 to 12, with pale-yellow ligules 

 about 4 mm. long: cup of receptacle campanulate and enclosing 

 many disk-achenes, these cuneate-oblong and somewhat 4-angled. 

 being prominently 1-nerved on each face: ray-achenes somewhat 

 falcate-obovate, either with or without an obvious nerve on each 

 side : receptacle either glabrous or minutely hirsute. 



At low altitudes from the Cuyamaca Mts., San Diego Co., 

 north to Oregon ; very common in some districts, rare or wanting 

 in others. Doubtless introduced from Chile. 



2. M. dissitiflora (Nutt.) T. & G., Fl. ii. 405 (1843). Mador- 

 ella dissitiflora Nutt., Trans. Am. Philos. Soc. ser. 2, 387 (1841). 



Very slender, 2 to 6 dm. high, simple or loosely branched : 

 herbage pubescent but moderately if at all viscid, at least below : 

 heads loosely racemose or more often paniculate, the peduncles 

 seldom very short : involucre 5 to 8 mm. high : cup of receptacle 

 ovoid but not closed, containing few disk-flowers : ray-flowers 5 

 to 8, the sulphur-yellow ligules 3 or 4 mm. long: disk-achenes 

 short and broad, flat, not angled but with one or both of the 

 faces more or less prominently 1-nerved: receptacle glabrous. 



In rather moist soil of the Upper Sonoran Zone from San 

 Diego Co. (Witch Creek, Alderson; Noble Mine, Chandler, no. 

 5489) to Oregon. Some specimens from near Los Angeles com- 

 bine the characters of M. dissitiflora and M. sativa in a very 

 perplexing manner, indicating that these two species are perhaps 

 confluent. 



3. M. elegans Don., in Lindl., Bot. Reg. t. 1458 (1831). Ma- 

 daria elegans DC., Prodr. v. 692 (1836). COMMON MADIA. 



Stout, 5 to 15 dm. high: herbage, particularly above, viscid 

 with short gland-tipped hairs, the inflorescence more or less 

 hirsute with white hairs : lower leaves linear, short-hirsute ; 



