Agebatum.] composite. ,443 



many, sub-2-serJate, narrow, herbaceous, sometimes connate. 5c- 

 ceptacle flat, naked. Corollas all equal, tubular, regular; tube 

 short ; limb campanulate, 5-toothed. Anthers truncate and with a 

 glandular tip, base obtuse. Style-arms elongate, dilated above. 

 Achenes obtuse, 5-ribbed, often glandular. Pappus'hairs 3-5, short, 

 rigid, often clavate, inserted in a short ring. — Species 5 or 6, chiefly 

 American, including the following which is cosmopolitan. 



A. viscosum, Forst. Char. G-en. 90 ; F. B. I. in, 242 ; Colletf 

 Fl. Siml. 246 ; Cooke Fl. Bomb, ii, 13, A. Eoylei, DC. A. elatum 

 and latifolium, Don. in DC. Prod, v, 112, Ageratum aquati- 

 oum, Soxh, Fl, Ind. Hi, 416. 



An erect, rarely decumhent annnal, 1-3 ft. high, gland-pubescent or nearly 

 glabrous, slender or robust. Leaves sessile or the lower ones petioled 

 up to 6 in, long, linear to broadly ovate or cordate, coarsely serrate. 

 Heads discoid, about i in. in diam., arranged in lax or dense panicles 

 or corymhs. inuoi-bracts oblong, obtuse or acute, glabrous glandnlar 

 or Bcabrid. Flowers white. Achenes f in. long, glabrous or rough with 

 glandular tubercles. 



A common weed in many parts of the area, especially in wet ground. 

 BiSTEiB. Throughout India, extending up to 6,000 ft. on the Himalaya ; 

 also in Ceylon, China and in all tropical countries. 



4. AGERATUM, Linn. ; Fl. Brit. Ind. iii, 243. 



Erect herbs or shrubs. Leaves opposite or the upper alternate. 

 Meads corymbose or panicled, homogamous. Involucre campanu- 

 late; S^'ac^^ 2-3-seriate, linear, subequal. Hecejptacle flat or nearly 

 ■so, naked or with caducous scales. Corollas all tubular, equal, 

 regular, limb 5-cleft. Anthers appendaged, base obtuse. Style-arms 

 ■elongate, obtuse. Achenes 5-angled. Pappus of 5 short free or 

 connate scales, or of 10-20 narrow unequal scales. — Species about 16, 

 probably all American. , 



A. conyzoides. Linn. Sp. PL 839 ; F. B. J. iii, 243 ; ColleU Fl. 

 Siml, 246 ; Cooke Fl. Bomb, ii, 14, A. cordifolium, Boxb. Fl. 

 . Ind. iii, 415, 



A softly hairy annual 1-2 ft. high. Stem branched, terete. Leaves peti- 

 oled, up to 5 in. long, ovate, cuneate to subcordate at the base, crenate. 

 Heads many, small, discoid, arranged in dense terminal corymbs. 

 Bracts of involucre linear, acute, ribbed on their backs. Flowers many, 

 the corolla pale blue or white. Achenes angled, often glandular, bliack. 

 Pappus- scales 6, connate below, awned and often barbed. 



