Ageratina luciae-brauniae
Ageratina herbacea
lucy Braun's snakeroot, rockhouse white snakeroot
desert ageratina, fragrant snakeroot, white thoroughwort
erect, glabrous.
erect (brittle), minutely puberulent.
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.
opposite;
petioles 10–25 mm;
blades triangular to lanceolate-ovate or ovate, 2–5(–7) × 1.5–3.5(–4.5) cm, bases truncate to shallowly cordate, margins dentate to serrate-dentate, abaxial faces sparsely hispidulous to glabrate, eglandular.
1–3 mm, glabrous or sparsely puberulent.
4–15 mm, puberulent.
3.5–4 mm.
4–5 mm.
white, lobes glabrous or sparsely puberulent.
white, glabrous.
apices acuminate, abaxial faces glabrous or sparsely puberulent.
apices acute, abaxial faces granular-puberulent.
clustered.
clustered.
sparsely and evenly hirtellous.
finely strigose-hispidulous.
= 34.
= 34.
Ageratina luciae-brauniae
Ageratina herbacea
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.)
Ageratina herbacea is recognized by the distinctive color of its usually yellow-green, sometimes grayish, leaves, granular-puberulent involucres (with minute, thickened, eglandular hairs), and woody rhizomes.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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