200 i;XX. COMPOSITiE. 



SuBTKiBE 6. Cale.ndfle.f.. (Gen. 120-121.) 

 120. DIMORPHOTHECA, Vaill. 



Heads radiate ; rays ligulate, female ; disk-flowers 5-toothed, 

 either all abortive or all bisexual, or (more usually) the outer 

 oues bisexual, inuer male, with abortive style and ovary. In- 

 volucre 1-seriate, of linear, acuminate scales. Keceptacle 

 ilat, becoming convex, nude or with a few deciduous paleae. 

 Style. of the fertile disk-flower shortly 2-fid, the arms diverging, 

 round-topped, glandular at margin and piliferous externally ; 

 of the female ray-flowers with long, glabrous arms. Achenes 

 without pappus, straight, those of the ray wingless, obconic, 

 3-cornered, tuberculated or sharply toothed, rarely smooth ; 

 of the disk flattened, with marginal, thick, wide wings. — Ft. 

 Cap. iii. p. 417 (including Acanthotheca, DC. !). 



Herbs or undershrubs, very often viscid and glandular. Leaves alternate, 

 toothed lobed or pinnate-parted, rarely entire, often seabrid. Heads ter- 

 minal, solitary ; disk-flowers yellow brown or rarely purple ; rays white 

 with purple underside, or purple or yellow. — 20 species, dispersed. 



121. TRIPTERIS, Less. 



Heads many-flowered, monoecious, radiate; rays ligulate, 

 female ; disk-flowers 5-toothed, bisexual, but sterile. Invo- 

 lucre 1-2-seriate, the scales free, often membrane-edged. Re- 

 ceptacle nude, flat. Anthers minutely setose. Styles of ray 

 2-fid ; of disk undivided. Achenes of ray 3-cornered, the 

 angles produced in mostly unequal wings, the sides smooth or 

 echinate, straight, substipitate, beaked, the beak hollow, an 

 one side closed with a hyaline membrane. — Fl. Cap. iii. p. 424. 



Herbs, undershrubs or rigid shrubs, mostly glandulai-ly viscid and strongly 

 scented. Leaves opposite or alternate, entire or toothed or cut. Heads 

 panicled or tenniual, solitary. Rays yellow white or purplish. — 27 species, 

 dispersed . 



122. OLIGOCARPUS, Less. 



Heads few-flowered, monoecious ; rays ligulate, female ; 

 disk-flowers male. Involucre 1-seriate. Receptacle nude. 

 Achenes of ray sessile, polymorphous, terete or 3-gonous, 

 scabrous or smooth, or ridged and pitted, wingless or minutely 

 3-winged, beaked or nearly or quite beakless, the beak either 

 solid and horn-like, short and knob-like, or hollow and cup- 

 like!— i<^/. Cap. in. p. 433. 



A small, many-stemmed, hairy and glandular annual. LeaA'cs alternate. 

 Fruit varying as above, often on the same root ! — Dis})crsed, but commoner 

 in the Eastern district. 



