Ageratina wrightii |
Ageratina luciae-brauniae |
|
---|---|---|
Wright's snakeroot |
lucy Braun's snakeroot, rockhouse white snakeroot |
|
Habit | Shrubs, 50–150 cm. | Perennials, 30–60 cm. |
Stems | erect, puberulous. |
erect, glabrous. |
Leaves | opposite proximally, alternate on distal 1/3–1/2 of stem; petioles narrowly winged, 3–5(–8) mm; blades ovate to deltate-ovate, mostly 1–2 × 0.5–1.5(–2) cm, bases truncate to cuneate or attenuate, margins entire or shallowly crenate, apices acute to blunt or obtuse, abaxial faces gland-dotted. |
opposite; petioles 25–70 mm; blades broadly ovate-deltate, 4–8 × 5–9 cm, (thin, delicate) bases truncate to subcordate, margins coarsely dentate, apices acute to acuminate, abaxial faces glabrous or sparsely puberulent. |
Peduncles | 1–3 mm, puberulent. |
1–3 mm, glabrous or sparsely puberulent. |
Involucres | 3.5–4.5 mm. |
3.5–4 mm. |
Corollas | pinkish white to pink, glabrous. |
white, lobes glabrous or sparsely puberulent. |
Phyllaries | apices acute, abaxial faces puberulent. |
apices acuminate, abaxial faces glabrous or sparsely puberulent. |
Heads | clustered. |
clustered. |
Cypselae | sparsely hispidulous. |
sparsely and evenly hirtellous. |
2n | = 34. |
|
Ageratina wrightii |
Ageratina luciae-brauniae |
|
Phenology | Flowering (Jul–)Aug–Oct(–Nov). | Flowering Aug–Oct. |
Habitat | Limestone slopes, ledges, alluvium, in brushy vegetation | Under overhanging sandstone (Pottsville formation) cliffs and ledges |
Elevation | 1300–2200 m (4300–7200 ft) | 400–500 m (1300–1600 ft) |
Distribution |
AZ; NM; TX; Mexico
|
KY; TN |
Discussion | Ageratina luciae-brauniae was treated by A. F. Clewell and J. W. Wooten (1971) as a synonym of A. altissima and regarded by them as “bizarre plants showing extreme signs of etiolation from growing under limestone ledges” (p. 134). B. E. Wofford (1976) observed that greenhouse transplants of both species maintained distinctions that provide rationale for maintaining A. luciae-brauniae at specific rank. Ageratina luciae-brauniae is in the Center for Plant Conservation’s National Collection of Endangered Plants. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
|
Source | FNA vol. 21, p. 552. | FNA vol. 21, p. 550. |
Parent taxa | Asteraceae > tribe Eupatorieae > Ageratina | Asteraceae > tribe Eupatorieae > Ageratina |
Sibling taxa | ||
Synonyms | Eupatorium wrightii | Eupatorium luciae-brauniae |
Name authority | (A. Gray) R. M. King & H. Robinson: Phytologia 19: 228. (1970) | (Fernald) R. M. King & H. Robinson: Phytologia 19: 215. (1970) |
Web links |