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
Found in FNA Volume 19. Treatment on page 309. Mentioned on page 217, 310, 360.
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.

References

None.

Facts about "Anisocoma"
AuthorDavid J. Keil +
EtymologyGreek anisos, unequal, and coma, hair, alluding to pappus +
IllustratorJohn Myers +
ReferenceNone +
Taxon nameAnisocoma +
Taxon parentAsteraceae tribe Cichorieae +
Taxon rankgenus +
VolumeVolume 19 +