294 Notes on Indian Botany. 



loosely imbricated : receptacle alveolate, alveolae 4-angled, 

 angles toothed ; flowers of the ray white or blue, of the disk 

 yellow. 



11. Callistephus, (Cass. D. C. 5-274). Capitula many 

 flowered ; of the ray ligulate female ; of the disk tubular her- 

 maphrodite : achaenia obovate cuniform compressed roughish : 

 pappus double, each of 1 -series ; exterior short, paleaceously 

 setaceous, cohering into a crown ; interior long, filiform, 

 rough, deciduous. Erect ramous, herbaceous, annuals ; 

 branches with a single capitulum on the apex : involucrum 

 3-4-series : scales ciliate obtuse, embraced by foliaceous bracts, 

 shorter than the involucrum : receptacle slightly alveolate, 

 flowers yellow. 



12. Heterochceta, (D. C. 5-282). Capitula many flower- 

 ed radiate : ligulae female linear, several series ; disk herma- 

 phrodite : young achaenia compressed ? pappus double, 

 exterior short paleaceous, interior long bristly rough. Pilosely 

 villous whitish herbs : capitula solitary terminal : scales of the 

 involucrum 2-3-series, equal, acuminate : receptacle naked, 

 punctulate : flowers of the ray white or purplish. 



13. Erigeron, (Lin. D. C. 5-283). Capitula many flower- 

 ed radiate : ligulae linear female several series ; disk tubular, 

 either all hermaphrodite or with the exterior florets female : 

 achaenia compressed, beakless : pappus 1-series. Herbaceous 

 or suffruticose ; leaves alternate : capitula hemispherical : 

 involucrum 2-3-series : receptacle naked, foviolately punct- 

 ate : flowers of the ray white, blue, or purple : disk yellow. 



14. Stenactis, (Nees. D. C. 5-298,) Capitula many 

 flowered ; those of the ray 1-series female, narrow ligulate ; 

 of the disk hermaphrodite 5-toothed : achaenia oblong com- 

 pressed : pappus of the ray 1-series, setaceous, of the disk 



