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Naturalized flora of The Morton Arboretum
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Ageratina lemmonii
(B.L. Robins.) King & H.E. Robins.
Family:
Asteraceae
Lemmon's Snakeroot
[
Eupatorium lemmonii
B.L. Robins.]
FNA
Resources
Guy L. Nesom in Flora of North America (vol. 21)
Perennials,
20-40(-70) cm (densely fibrous-rooted crowns).
Stems
(commonly purple) erect, puberulous (hairs usually with colored crosswalls).
Leaves
opposite; petioles usually 0, sometimes 1-2 mm; blades ovate-lanceolate, 2-4.5 × 0.5-2.5 cm, margins shallowly serrate, abaxial faces glabrous or glabrate, gland-dotted.
Heads
in loose, open arrays.
Peduncles
10-60 mm, puberulent.
Involucres
4-5.5 mm.
Phyllaries:
(narrowly oblong-lanceolate) apices acute, abaxial faces sparsely hairy to glabrate.
Corollas
white, lobes densely hispid-villous.
Cypselae
sparsely and finely hispidulous.
2
n
= 34.
Flowering Aug-Oct. Rocky slopes, mostly in pine-oak woodlands; 1800-2800[-3300, Mexico] m; Ariz.; Mexico.
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