Adenostemma.'] 
COMPOSITE. 
163 
shortly 5-toothed. Anthers truncate at the base and apex. Style- 
branches long, flattened, recurved, petaloid, clavate. Achenes cylin- 
drical, acutely angular ; pappus a ring, with 3-5 short bristles gland- 
clubbed at the tip. — Herbs with opposite leaves and laxly corymbose 
heads. Distrib. Round the word in the tropics. Species 4-5. 
1. A. viscosum, Forst. ; DC. Prod. v. 111. A robust perennial herb, 
2-4 feet high, with a creeping root-stock, the upper branches finely 
downy. Leaves few, opposite, long-petioled, rhomboid, membranous, 
glabrous, toothed, 3-4 in. long. Heads few, in very lax corymbs ; pedi- 
cels finely gland-downy. Flowers 20-30 in a head. Involucre \ in. 
long ; scales oblanceolate, obtuse, herbaceous, nearly naked. Achenes 
shorter than the scales of the involucre, stout, distinctly angled, 
glandular ; pappus-rays very short. A. mauritianum and upwards of 
20 other species, DC. Prod. loc. cit. 
Mauritius, in shaded and damp places, frequent. Round the world in the 
tropics. 
4. AGERATUM, Linn. 
Heads of many uniform tubular purplish flowers. Involucre 
campanulate, of many scariose linear acute subequal scales. Receptacle 
convex, alveolate. Corolla-limb cylindrical ; teeth 5, short. Anthers 
obtuse at the base. Style-branches long, falcate, clavate. Achenes 
minute, cylindrical, angular; pappus of 4-5 lanceolate acuminate scales. 
— Herbs with opposite petioled leaves and copious small heads in dense 
corymbs. Distrib. Round the world in the tropics, mostly American. 
Species about 20. 
1. A. conyzoides, Linn. ; DC. Prod. v. 108. An erect pilose 
annual, 2-3 feet high. Leaves few, distinctly petioled, ovate, mem- 
branous, crenate, 3-4 in, long. Heads in dense terminal corymbs, with 
short pedicels. Involucre £ in. long and broad ; scales pale green, 
linear, obscurely pilose. Achenes brown-black, scabrous, slender, 
angular, ^ in. long ; pappus as long as the achene. 
Mauritius, Rodriguez, and Seychelles, common in waste ground ; Round 
Island, Sir H. BarJcly ! Round the world in the tropics. Herb de Bouc. 
* EUPATORIUM, Linn. 
Heads of numerous uniform tubular flowers. Involucre campanu- 
late ; scales linear, numerous, imbricated. Receptacle naked, flat or 
convex. Anthers obtuse at the base. Style-branches long, clubbed. 
Achenes cylindrical, angular; pappus of a single row of bristles as long 
as the achene. — Herbs or undershrubs with opposite leaves. Distrib. 
Nearly all American. Species 400. 
Leaves deltoid, finely downy. Receptacle convex . . . * E. ccglestinum. 
Leaves linear, glabrous. Receptacle flat * E. triplinerve. 
* F. ccdestinum , Linn. (Conoclinium coelestinum, DC. Prod. v. 135), 
a native of North America, is naturalised in Mauritius on the slopes 
m 2 
