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AGERATUM mexicanum.
Mexican Agératum.
Natural Order. Compositæ. Adanson Fam. 2.103.
Sect. III. E u p a t o r e æ . Kunth Synops. 2. p . 408.
A G E R A TUM . Involucrum campanulato-hemisphæricum,
polyphyllum, subæquale, multiflorum. Receptaculum uudum.
Flosculi omnes tubulosi, hermaphroditi. Anthera inclusæ.
Stigma exsertum. Akenia quinquangularia, squamulis subulatis
aut breviter aristatis coronata. Herbæ aut frútices. Folia
opposita, integra. Flores corymhosi, violacei aut alòidi. Kunth
synops. 2. p. 437.
A. mexicanum, caule herbáceo ramoso diffuso ; ramis adscen-
dentibus hispidis, foliis rugosis crenatis piloso-pubescentibus
obtusiusculis : inferioribus cordatis reticulato-venosis ; supe-
rioribus ovatis basi rotundatis triplinerviis, paleis pappi lanceolatis
basi membranaceis apice aristatis subdenticulatis.
Ageratum mexicanum. Bot. mag. 2524.
Annual, about a foot in height, much branched.
Branches spreading, upper ones erect, the others
ascending, hispidly pubescent. Leaves rugose, bluntish,
crenate, or toothed with blunt rounded teeth,
slightly hairy on the upper side, hairy and pubescent
ou the lower; lower ones as broad as long, petiolate,
cordate at the base, reticulately veined underneath;
upper ones ovate, triply-nerved, less toothed, or rarely
entire, nearly sessile. Petioles deeply channelled on
the upper side and rounded on the lower, glandularly
hairy. Flowers paniculately corymbose, of a light
blue, inclining to violet. Bractes several, some at the
base of, others ou the pedicles, the lower ones largest,
2 A