242 Lxxviii. COMPOSITE. (J. D. Hooker.) lElephaniopus. 



6. EI.X:PKAITT0PVS, Limi. 



Eigid herl)8. Leaves alternate. Heads homogamous of 2-5 flowers col- 

 lected into a head-like cluster. Involucre compressed ; bracts about 8, dry, stiff, 

 alternately flat and conduplicate ; receptacle naked. Flowers all equally 4-lol)ed 

 and cleft on one side and with the lohes spreading somewhat palmately. 

 Anther-hases obtuse. Style^arms subulate. Achenes truncate, 10-ribbed; 

 pappus bristles rigid, shining, slender and dilated below or chafi'-like.^DisiKlB. 

 Species 10-12, chiefly tropical American, with one cosmopolitan. 



1. Za. scaber, lAnn.; DC. Prodr. v. 86; dichotomously branched, 1-2 ft. 

 high, strigose scabrid and villous, radical leaves obovate-oblong crenate cauline 

 few sessile, heads clusters of 1 in. diam. surrounded by cordate leafy bracts, 

 invol. bracts pungent, achenes hairy, pappus of 4-6 rigid bristles dilated 

 at the base. WaU. Cat. 2979 ; Wight. Ic. t. 1086 ; Roxh. Fl. Ind. iii. 445 ; 

 Don Prodr. 169 ; Dalz. ^ Oibs. Bomb. Fl. 122 ; Clarke Comp. Ind. 28.— 

 Rheede Sort. Mai. x. t. 7. 



Throughout India, from the Punjab ? to Obtlon and Singapore. — Distbib. 

 Tropical Asia, Australia and America. 



The embryo not unfrequently germinates in the head. 



Tbibs II. eupatorxeh:. 



7. ADEKOSTEianXA, J'orsi. 



Glabrous or glandulajypubescent herbs. Leaves mostly opposite. Heads 

 corymbose, homogamous. Involucre campanulate ; bracts many, sub-2-seriate, 

 narrow, herbaceous, sometimes connate ; receptacle flat, naked. Corollas all 

 equal, tubular, regular ; tube short ; limb campanulate, 6-toothed. Anthers 

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

 Achenes obtuse, 6-ribbed, glandular ; pappus hairs 3-6, short, rigid, often clavate, 

 inserted in a short ring. — Distkib. Species 5 or 6 American, 1 cosmopolitan. 



1. A. viscosum, Forst ; BC. Prodr. v. iii. ; Clarke Comp. Ind. 28. 



Throughout India ; ascending to 5000 ft. on the Himalaya and other ranges, and 

 to 6000 in Ceylon. — Disteib. All tropical countries. 



An erect rarely decumbent annual, glabrous pubescent or viscidly pubescent, 

 slender or robust. Leaves sessile or petioled, opposite or the upper alternate, from 

 linear to broadly ovate, serrate. Heads few or many, in lax or dense panicles or 

 corymbs ; invol. bracts oblong, obtuse or acute, glabrous glandular or scabrid. — Of 

 this most variable plant there is but one species. Clarke distinguishes the following 

 marked Indian forms. 



Vab. 1 . typica ; leaves oblong-lanceolate subacute crenate glabrescent, achenes 

 sparingly warted. BC. I. c. A. leiocarpnm, DC. in Wight. Contrib. 9 ; Prodr. I. <i. 

 A. Eoylei, DO. I. c. 112. A. rivale, Dale, in Hook. Kem Journ. iii. 231 ; Dalz. ^ Gibs. 

 Bomb. Fl. 122. A. angustifolium, Am. PugiU. 29 ; DC. I. c. vii. 266. Lavenia alba, 

 Wall. Cat. 3220. Ageratnm aquaticum, Boxb. Sort. Beng. 61 ; Fl. Ind. iii. 416. 



A''ae. 2. elaia; leaves broadly ovate or cordate nearly glabrous, achenes and invol. 

 bracts as in Var. 1. A. elatum, DC. I.e. 112; 1 Don Prodr. 181. A. aquaticum, 

 Dan I. c. A. microcephalum, DC. I.e. Lavenia erecta and carnosa, Wall. Cat. 3218 

 in 'part, 3219. Ageratum strictum, Bot. Mag.t. 2410. 



Vae. 3. latifolia; leaves broadly ovate or cordate nearly glabrous sometimes 

 very large, achenes densely warted. A. latifolium, DC. I.e. 112; Don Prodr. 181. 

 Iiavenia erecta. Wall. Cat. 3218 C. — one of the best marked varieties. 



Vae. 4. parviflora; leaves elliptic glabrous membranous, branches of panicle 

 slender, achenes small densely warted. A. macrophyllum and parviflonim, DC. I. c. 

 iii. 113. Lavenia macrophylla and parviflora, Blirnie Bijd. 905, 906. Lavenia 

 viseida. Wall. Cat. 3222 A. 



