Ageratina havanensis

(Kunth) R. M. King & H. Robinson

Phytologia 19: 222. 1970.

Common names: Havana snakeroot
Basionym: Eupatorium havanense Kunth inA. von Humboldt et al. Nov. Gen. Sp. 4(fol.): 100. 1818; 4(qto.): 128. 1820
Treatment appears in FNA Volume 21. Treatment on page 552. Mentioned on page 548.

Shrubs [trees], (30–) 69–150 (–200) cm. Stems erect (brittle), puberulent to glabrous. Leaves persistent, opposite; petioles 3–10 (–15) mm; blades deltate to broadly ovate or somewhat hastate, (2–) 3–5 (–8) × 2–5 cm, bases truncate to cuneate, margins dentate, apices acute, faces glabrous or nearly so, eglandular. Heads clustered. Peduncles 2–14 mm, minutely puberulent. Involucres 4–6 mm. Phyllaries: apices acute, abaxial faces glabrous or nearly so. Corollas white to slightly pinkish, glabrous. Cypselae hispid. 2n = 34.


Phenology: Flowering mainly (Sep–)Oct–Nov(–Dec), also Apr–Jul.
Habitat: Bluffs, limestone outcrops and slopes, ledges along streams, often in oak-juniper woodlands
Elevation: 100–900 m

Distribution

V21-1400-distribution-map.gif

Tex., Mexico, West Indies (Cuba)

Discussion

Ageratina havanensis apparently is the only species of the genus in the flora area with evergreen-persistent leaves.

Selected References

None.

Lower Taxa

None.

"fine" is not a number.

... more about "Ageratina havanensis"
nearly +  and glabrous +
not tailed +, truncate +, rounded +  and obtuse +
scarious +
usually ovate +  and lanceolate +
usually terete +  and clavate +
indeterminate +  and determinate +
Guy L. Nesom +
(Kunth) R. M. King & H. Robinson +
truncate +  and cuneate +
enlarged +
Eupatorium havanense +
3(-5)-nerved +
5 cm50 mm <br />0.05 m <br /> (8 cm80 mm <br />0.08 m <br />) +
3 cm30 mm <br />0.03 m <br /> (5 cm50 mm <br />0.05 m <br />) +
dissected +, lobed +, toothed +  and entire +
hastate;deltate;broadly ovate +
2cm;5cm +
papillate +  and rugose +
(4-)5-angled;10-ribbed +
Havana snakeroot +
white +  and slightly pinkish +
scabrellous +
fusiform +  and prismatic +
fertile +  and bisexual +
Tex. +, Mexico +  and West Indies (Cuba) +
100–900 m +
nearly +  and glabrous +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Bluffs, limestone outcrops and slopes, ledges along streams, often in oak-juniper 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 /> (0.6 cm6 mm <br />0.006 m <br />) +
persistent +
lanceolate +  and lance-linear +
2-carpellate +
persistent +
0.2 cm2 mm <br />0.002 m <br /> (1.4 cm14 mm <br />0.014 m <br />) +
1 cm10 mm <br />0.01 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
0.3 cm3 mm <br />0.003 m <br /> (1 cm10 mm <br />0.01 m <br />) +
Flowering mainly (Sep–)Oct–Nov(–Dec), also Apr–Jul. +
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 havanensis +
Ageratina +
species +
obconic +  and campanulate +