COMPOSITAE 477 



Occasionally cultivated, fl. Oct.-May. A native of tropical America, 

 introduced and cultivated here for ornamental purposes, not spontaneous. 



Helianthiia eucrnnerifoliue Torr. and Gray, a native of the south-eastern 

 United States dnd Mexico is a recent introduction, occasionally found in 

 cultivation. It differs from H. annuus in i,ts smaller size, slender, much- 

 branched, mottled stems, long-peduncles, much smaller heads and caudate- 

 acuminate involucral-bracts. 



21. WEDELIA Jacquin 



Scabrid, wide-spreading, coarse or slender, often climbing herbs. Leaves 

 opposite, ovate. Heads axillary or terminal, peduncled, yellow. Ray- 

 flowers female, 1-seriate, the ligule spreading, often toothed. Disk-flowers 

 many, perfect, the limb tubular, 5-toothed. Involucral-bracts about 2- 

 seriate, the outer few often foliaceous. Receptacle flat, the scales enclos- 

 ing the flowers. Achenes cuneate-oblong or obovoid, angled or compressed, 

 margins obtuse or thickened; pappus none or a toothed cup or ring, or 

 of scales. (In honor of G. W. Wedel, a German botanist.) 



Species about 45, tropical and subtropical, 1 or 2 in the Philippines. 



Leaves ovate, 3 to 12 cm wide; a coarse spreading or climbing plant. 



1. W. biflora 



Leaves oblong to oblong-lanceolate, 1.5 cm wide or less, base narrowed; a 



slender plant 2. W. prostrata 



1. W. biflora (L.) DC. Hagonoy (Tag.). 



A climbing, scaberulous, herbaceous vine. Leaves ovate, acuminate, 

 rather coarsely serrate, 6 to 18 cm long, base rounded, triplinerved, the 

 petioles 2 to 6 cm long. Heads 3 cm in diameter or less, peduncled, l.to 3, 

 sometimes more, in the upper axils, the peduncles 7 to 10 cm long. Involu- 

 cral-bracts narrowly oblong, somewhat recurved, pubescent, equaling or 

 exceeding the disk. Ray-flowers 6 to 15, the ligule oblong, yellow, 3-toothed, 

 6 to 12 mm long. Disk-flowers numerous, yellow or yellowish-brown. 



Along the seashore, in thickets, common, fl. all the year; in littoral 

 districts throughout the Philippines. India to China through Malaya to 

 Polynesia. 



2. W. PEOSTRATA (H. & A.) Hemsl. 



A slender, spreading, strigose-pubescent plant, the branches usually less 

 than 50 cm long. Leaves oblong to oblong-lanceolate, 2 to 4.5 cm long, 

 narrowed at both ends, entire or obscurely toothed, strigose on both 

 surfaces. Heads peduncled, about 1 cm in diameter, yellow, the bracts 

 oblong-ovate, not spreading. 



In open grassy places near the walled city, raxe, fl. Jan.-March, and 

 probably in other months; jotherwise unknown in the Philippines, and 

 undoubtedly introduced here. Japan to Formosa and southern China. 



22. COSMOS Linnaeus 



Erect branched herbs with lobed to pinnately divided leaves. Heads 

 peduncled, heterogamous, the ray flowers variously colored or white. In- 

 volucre subhemispheric, the bracts 2-seriate, connate near the base. Recep- 

 tacle flat, somewhat scaly. Ray-flowers ligulate, the limb spreading, usually 

 toothed. Disk-flowers perfect, tubular, the limb 5-toothed. Achenes nar- 



