Ageratina lemmonii

(B. L. Robinson) R. M. King & H. Robinson

Phytologia 19: 223. 1970.

Common names: Lemmon’s snakeroot
Basionym: Eupatorium lemmonii B. L. Robinson Proc. Amer. Acad. Arts 27: 171. 1892 (as lemmoni)
Treatment appears in FNA Volume 21. Treatment on page 551. Mentioned on page 548.

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 ovatelanceolate, 2–4.5 × 0.5–2.5 cm, margins shallowly serrate, abaxial faces glabrous or glabrate, glanddotted. 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. 2n = 34.


Phenology: Flowering Aug–Oct.
Habitat: Rocky slopes, mostly in pine-oak woodlands
Elevation: 1800–2800[–3300, Mexico] m

Discussion

Selected References

None.

Lower Taxa

None.

"fine" is not a number.

... more about "Ageratina lemmonii"
sparsely hairy +  and glabrate +
not tailed +, truncate +, rounded +  and obtuse +
scarious +
usually ovate +  and lanceolate +
usually terete +  and clavate +
indeterminate +  and determinate +
Guy L. Nesom +
(B. L. Robinson) R. M. King & H. Robinson +
decurrent +
enlarged +
Eupatorium lemmonii +
3(-5)-nerved +
2 cm20 mm <br />0.02 m <br /> (4.5 cm45 mm <br />0.045 m <br />) +
dissected +, lobed +, toothed +  and entire +
ovatelanceolate +
0.5cm;2.5cm +
papillate +  and rugose +
(4-)5-angled;10-ribbed +
Lemmon’s snakeroot +
scabrellous +
fusiform +  and prismatic +
fertile +  and bisexual +
Ariz. +  and Mexico +
1800–2800[–3300, Mexico] m +
puberulent +, pilose +, hispidulous +  and glabrous +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Rocky slopes, mostly in pine-oak woodlands +
indeterminate +
each +  and sessile +
0.3 cm3 mm <br />0.003 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
campanulate +
0.4 cm4 mm <br />0.004 m <br /> (0.55 cm5.5 mm <br />0.0055 m <br />) +
hispid-villous +
lanceolate +  and lance-linear +
2-carpellate +
persistent +
1 cm10 mm <br />0.01 m <br /> (6 cm60 mm <br />0.06 m <br />) +
0.1 cm1 mm <br />0.001 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
Flowering Aug–Oct. +
2-nerved +  and 0-nerved +
8 +  and 30 +
subequal +  and unequal +
bearing subulate enations +, hairy +  and bristly +
exalbuminous +
appendaged +  and truncate +
hirsutulous +
papillate +
Compositae +
Ageratina lemmonii +
Ageratina +
species +
obconic +  and campanulate +
40 cm400 mm <br />0.4 m <br /> (70 cm700 mm <br />0.7 m <br />) +
20 cm200 mm <br />0.2 m <br /> (40 cm400 mm <br />0.4 m <br />) +
shrub +  and subshrub +