Anisocoma

Torrey & A. Gray

Boston J. Nat. Hist. 5: 111, plate 13, figs. 7–11. 1845.

Etymology: Greek anisos, unequal, and coma, hair, alluding to pappus
Treatment appears in FNA Volume 19. Treatment on page 309. Mentioned on page 217, 310, 360.
 TaxonIllustrator 
FNA19 P31 Calycoseris wrightii.jpegCalycoseris wrightii
Atrichoseris platyphylla
Anisocoma acaulis
Bee F. Gunn
John Myers
John Myers

Annuals, 5–25 cm (± scapiform); taprooted. Stems 1–25+, erect or ascending, simple, glabrous or densely tomentose, sometimes glabrescent. Leaves basal or subbasal; petiolate (petioles winged); blades oblanceolate, margins pinnately lobed, denticulate (teeth callose-tipped). Heads borne singly. Peduncles not inflated distally, ebracteate. Calyculi 0. Involucres cylindric to campanulate, 4–20 mm diam. Phyllaries 15–25 in 4–5 series, (centers green to reddish purple) unequal, outer ovate to orbiculate, inner linear to oblong, flat, margins papery-transparent, apices rounded or obtuse to subacute. Receptacles flat to weakly convex, smooth, paleate (paleae slender, bristlelike). Florets ca. 40; corollas cream to bright-yellow. Cypselae tan, cylindric, (bases tapered) beaks 0 (or ca. 0.5 mm), 10–15-nerved, finely appressed-puberulent; pappi readily falling, of 10, distinct, white, plumose bristles in 1 series (adaxial usually shorter than abaxial). x = 7.

Distribution

sw United States, nw Mexico

Discussion

Species 1.

Molecular phylogenetic studies by J. Lee et al. (2003) indicated that Malacothrix is polyphyletic and that Anisocoma and Calycoseris are nested within the subclade of Malacothrix that contains M. californica, the type species of that genus. Anisocoma shares its base chromosome number (x = 7) with Calycoseris and the species of Malacothrix with which it is most closely grouped. Anisocoma differs from Malacothrix and Calycoseris in having paleate receptacles and pappi of plumose, rather than barbellulate bristles.

Selected References

None.

Lower Taxa

"fine" is not a number.

... more about "Anisocoma"
obtuse;subacute +
scarious +
ovate +  and lanceolate +
paniculiform +  and corymbiform +
indeterminate +  and determinate +
David J. Keil +
Torrey & A. Gray +
decurrent +
10-15-nerved +
appressed-puberulent +
compound +  and simple +
oblanceolate +
tuberculate +, rugose +, muricate +  and smooth +
filiform +
zygomorphic +, actinomorphic +  and (3-)5-merous +
cream +  and bright-yellow +
cylindric +
sw United States +  and nw Mexico +
Greek anisos, unequal, and coma, hair, alluding to pappus +
winged +  and beaked +
dispersed +
indeterminate +
each +  and sessile +
0.4 cm4 mm <br />0.004 m <br /> (2 cm20 mm <br />0.02 m <br />) +
cylindric;campanulate +
subbasal +  and basal +
papery-transparent +
denticulate +  and lobed +
ovate +  and orbiculate +
2-carpellate +
connate +  and distinct +
15 +  and 25 +
Boston J. Nat. Hist. +
bearing subulate enations +, hairy +  and bristly +
flat;weakly convex +
exalbuminous +
ascending +  and erect +
glabrescent +, tomentose +  and glabrous +
1 +  and 25 +
appendaged +  and truncate +
papillate +
Undefined tribe Lactuceae +
Anisocoma +
Asteraceae tribe Cichorieae +
5 cm50 mm <br />0.05 m <br /> (25 cm250 mm <br />0.25 m <br />) +
shrub +  and subshrub +