Brickelliastrum

R. M. King & H. Robinson

Phytologia 24: 63. 1972.

Etymology: Generic name Brickellia and Latin - astrum, indicating inferiority or an incomplete resemblance
Treatment appears in FNA Volume 21. Treatment on page 507. Mentioned on page 461, 509.
 TaxonIllustrator 
FNA21 P76 Brickelliastrum fendl.jpegBrickelliastrum fendleri
Flyriella parryi
Linny Heagy
Linny Heagy

Perennials or subshrubs, 30–80+ cm (plants not viscid). Stems decumbent to erect, much branched from bases. Leaves cauline; mostly opposite (distal sometimes alternate); petiolate; blades usually 3-nerved, deltate to ovate, margins crenate-dentate, faces pubescent or glabrous, sometimes glanddotted. Heads discoid, in loose, corymbiform to paniculiform arrays. Involucres ± campanulate, 4–7 mm diam. Phyllaries persistent, 20–25 in 3–4 series, 2-nerved or 4-nerved, lanceovate to lanceolate, unequal (herbaceous to chartaceous). Receptacles convex, epaleate. Florets 25–35; corollas white or yellowish white, throats funnelform (lengths 2.5–4 times diams.); styles: bases not enlarged, glabrous, branches narrowly clavate. Cypselae prismatic, 5 (–7) -ribbed, puberulent; pappi readily falling or fragile, of ca. 25 barbellate bristles in 1 series. x = 10.

Distribution

sw United States, n Mexico

Discussion

Species 2 (1 in the flora).

B. L. Turner (1988c, 1994c, 1996+) placed Brickelliastrum, Asanthus, and the Mexican genus Dyscritogyne R. M. King & H. Robinson within Steviopsis R. M. King & H. Robinson. All four are essentially segregates of Brickellia, distinguished especially by their lack of pubescent swellings at bases of stylar shafts. As noted by Turner, this aggregate forms a heterogeneous group; the finer division is followed here until further evidence indicates a better taxonomic disposition.

Selected References

None.

"fine" is not a number.

... more about "Brickelliastrum"
not tailed +, truncate +, rounded +  and obtuse +
scarious +
usually ovate +  and lanceolate +
usually terete +  and clavate +
corymbiform +  and paniculiform +
indeterminate +  and determinate +
Guy L. Nesom +
R. M. King & H. Robinson +
decurrent +
not enlarged +
dissected +, lobed +, toothed +  and entire +
deltate;ovate +
papillate +  and rugose +
(4-)5-angled;10-ribbed +
yellowish white +  and white +
prismatic +
fertile +  and bisexual +
sw United States +  and n Mexico +
Generic name Brickellia and Latin - astrum, indicating inferiority or an incomplete resemblance +
glabrous +  and pubescent +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
in usually determinate , rarely indeterminate , arrays +  and singly +
indeterminate +
each +  and sessile +
0.4 cm4 mm <br />0.004 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
campanulate +
lanceolate +  and lance-linear +
2-carpellate +
persistent +
4-nerved +  and 2-nerved +
20 +  and 25 +
bearing subulate enations +, hairy +  and bristly +
exalbuminous +
decumbent +  and erect +
appendaged +  and truncate +
hirsutulous +
papillate +
Compositae +
Brickelliastrum +
Asteraceae tribe Eupatorieae +
30 cm300 mm <br />0.3 m <br /> (80 cm800 mm <br />0.8 m <br />) +