15 
AGERATUM conyzoIvEs. 
Hairy Ageratum. 
SYNGENESIA POLYGAMIA ZQUALIS.—Nar. Orv. COMPOSITZ, De Cand. 
SYNANTHEREA, Trib. Evratoriz, Cass. 
Gen. Cuar.—Receptaculum nudum. Pappus paleis 5, subaristatis. Involu- 
crum oblongum, duplici foliorum serie. Corollula 4 seu 5-fide, Willd. 
Ageratum conyzoides; foliis ovato-rhomboideis, caule piloso, paleis pappi 
aristatis denticulatis. 
A. conyzoides, Witxp. Sp. Pl. v. iii. p. 1773.—Art- Hort. Kew. éd 2. v. iv. 
p- 5 cuKkunHR, Bot. Handb. t. 238. 
Stem, 1-2 feet high, cylindrical, hairy, erect, much branched, with the 
branches opposite, erecto-patent. Leaves ovate, approaching to rhom- 
® boid, rugose, recurvo-patent, pubescent, the lower part of the margins 
acutely serrated, petiolated ; petioles as long as the leaf, grooved, pilose. 
Flowers bright blue, inclining to purple, in terminal and lateral small pe- 
dunculated corymbs, which have small bracteas at the base of the stalk. 
Involucre ovato-cylindrical, slightly pilose, composed of abcut 14 erect 
scales in 2 rows, of which the outer half are oblongo-lanceolate, the inner 
(alternate with the outer) almost setaceous ; they appear slightly toothed, 
under a high magnifying power. Receptacle small, naked, containing few 
florets, which are shorter than the involucre, so that nothing but the 
styles are protruded. Corollules tubular, with 5 blue teeth, the rest white. 
Styles much protruded, filiform, pubescent, blue. Germen scabrous, ter- 
minated by 5 white sete, which are broad at the base. Pericarp (achenium) 
blackish-brown, soon falling out from the expanded involucre. Pappus 
of 5 ovate scales, terminated each by a long arista, minutely toothed for 
their whole length. : é 
A native of South America and the West —— | 
and an annual, but easily propagated, and well deserving of a 
place in every stove. It flowers during a considerable period of 
the summer; and even the severities of winter witness the ex- 
pansion of its pretty blue blossoms. 7 , 
bail 
VOL. E 
