SUNFLOWER FAMILY. 



.327 



Tribe 6. Madieae. Tarweed Tribe. 



4-"). MADIA Mol. Tabweed. 

 Glandular-viscid heavy-scented erect annual or perennial herbs. 

 Leaves, at least the upper, alternate, entire or serrate. Heads axillary 

 and terminal. Flowers yellow, opening in the evening and closing 

 before noon of the next day. Involucre angled by the salient cari- 

 nate or almost conduplicate bracts; bracts in 1 series, completely 

 enfolding the laterally compressed ray-achenes, and with free mod- 

 erately long or short tips. Receptacle flat or convex, bearing a 

 single row of chaffy bracts between ray- and disk-flowers and often 

 united and forming a cup. Disk-corollas in ours pubescent. Rays 

 few to many, 3-lobed. Bracts of involucre deciduous with the 

 mature ray-achenes, these beakless (except in no. 5). Disk-achenes 

 fertile or abortive. (Madi, the Chilian name.) 



A. Receptacle glabrous. 



Achenes beakless. 



Rays very short and inconspicuous; achenes of ray curved; pappus none. 

 Plants stoutish and viscid-glandular; heads in clusters. 



Herbage ill-scented L Jf. sativa. 



Herbage honey-scented '. . . . 2. Jf. capitata. 



Plants slender and moderately glandular; heads scattered 



3. M. dissitijlora. 



Rays showy; achenes of ray incurved; leaves some or mostly opposite; 



'pappus present 4. M. madioides. 



Achenes with a minute reflexed beak; rays % in. long; pappus none . . . . 



5. M. radiata. 



B. Receptacle fimbrillate-hirsute. 



Achenes beakless, those of the ray not incurved; pappus none; rays showy. 



6. M. elegans. 



1. M. sativa Molina. Chile Tarweed. Robust, 1 to 4 ft. high, 

 pubescent with slender hairs and beset with pedicellate very viscid 

 glands; ill-scented; leaves from broadly lanceolate to linear; heads 5 

 to 6 lines high, short-peduncled or sessile, disposed in the upper axils 

 and at the ends of short branches; bracts of involucre hispid; rays 5 

 to 12, with pale yellow ligules about 2 lines long; cup of receptacle 

 campanulate and enclosing many disk-achenes, these cuneate-oblong 

 and 4-angled, prominently 1-nerved on the sides and 2 lines long; 

 ray-achenes somewhat falcale-obovate, either with or without an 

 obvious nerve on the sides. 



Common in vacant lots, waysides, etc., about San Francisco. 

 Doubtless naturalized from Chile. July-Aug. 



2. M. capitata Nutt. Erect, H to 2£ ft. high; simple or branch- 

 ing; herbage very viscid-glandular, honey-scented; leaves linear; 

 heads somewhat longer than in the preceding, capitate-congested at 

 the ends of the branches; bracts of involucre short-bristly; cup of 

 receptacle narrow and nearly closed, containing very few achenes; 

 bracts of involucre and achenes semi-persistent. 



North Coast Ranges; Gilroy; Santa Cruz. 



Yar. anomala (M. anomala Greene). Chaffy bracts of receptacle 



