Notes on Ageratina in Texas
Shrubby Boneset (Ageratina havanensis)
White Snakeroot (Ageratina altissima)
Other species (A. wrightii) less than 5 RG observations
BONAP range
Glossary of Leaves for convenience
| A. havanensis | A. altissima | ||
|---|---|---|---|
| Form | Shrub | Herbaceous Perennial | |
| Woody Stem? | Yes
|
No | |
| Leaf shape | Deltate to broadly ovate or somewhat hastate
|
Deltate-ovate to ovate or broadly lanceolate
|
|
| Petiole length | 3-10 mm | 10-30 mm | |
| Leaf margins | Dentate, sometimes bluntly
|
Coarsely and doubly serrated/incised | |
| Cypsellae texture | Hispid (Stiff hairs/bristles) | Glabrous |
It's been observed that the anther filaments do not stick out as much/are less prominent. This does seem true... Not confident about reliability yet but looks promising.
Also according to FNA,
"Ageratina havanensis apparently is the only species of the genus in the flora area with evergreen-persistent leaves."
Links:
FNA:
http://beta.floranorthamerica.org/Ageratina_havanensis
http://beta.floranorthamerica.org/Ageratina_altissima
GBIF (Herbarium specimens)
https://www.gbif.org/species/5400768 A. havanensis
https://www.gbif.org/species/5400552 A. altissima
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