230 Composites Stokesia. 



toothed, the inner ciliated. Receptacle naked, fleshy. Outer 

 florets largest. Pappus of one row of membranous scales, nearly 

 equalling the corolla. Named in honour of an English 

 botanist. 



1. S. cyanea. Stem herbaceous, covered with a close cottony 

 down, glaucescent, about 2 feet high. Leaves sessile, alternate, 

 lanceolate, acute, with a few spiny teeth near the base ; lower 

 ones much longer. Flowers blue, glandular, produced in 

 September. A native of Carolina, and rather tender. 



2. 



Leaves opposite, usually narrow and entire, and furnished 

 with pellucid dots. Flower-head small ; involucre of a single 

 row of bracts ; receptacle naked. Pappus bristly or scaly. An 

 American genus of about thirty species, of which one hardy 

 annual has lately been introduced. 



1. P. angustifolia. A dwarf annual 4 to 6 inches high 

 with yellow fragrant flowers. North-west America. 



TRIBE ILEUPATORIE^J. 



Leaves usually opposite. Florets all tubular and herma- 

 phrodite. Branches of the style usually club-shaped or en- 

 larged at the extremities. 



3. AGERATUM. 



Annual herbs with opposite leaves and blue or white 

 flowers. Involucre of many imbricated linear bracts. Recep- 

 tacle naked. Pappus composed of several awned scales broad 

 at the base. This genus includes a few American species, and 

 one widely distributed throughout the tropics. Name from a, 

 not, and 7%>ay, old age, probably in reference to the absence of 

 white pappus on the achenes. 



1. A. Mexicanum.-^-T'his has long been a favourite bedding 

 and border plant, on account of the profusion of its lilac-blue 

 flowers. There is a white-flowered variety, and recently some 

 dwarf forms have been raised, but unfortunately their beauty 

 is of short duration. 



Coslestinia ageratoides and ccerulea are closely allied garden 

 plants in which the pappus is toothed and cup-shaped. 

 Mikania scdndens is a tender South American twining plant 

 with glabrous shining cordate leaves and yellowish white 



