Dimeresia

A. Gray in A. Gray et al.

in A. Gray et al., Syn. Fl. N. Amer. ed. 2, 1(2): 448. 1886.

Etymology: Greek dimeres, in 2 parts or with 2 members, allusion unclear
Treatment appears in FNA Volume 21. Treatment on page 182. Mentioned on page 364, 401.
 TaxonIllustrator 
FNA21 P29 Dimeresia howelii.jpegDimeresia howellii
Coreopsis californica
Coreopsis tripteris
Marjorie C. Leggitt
Yevonn Wilson-Ramsey
Yevonn Wilson-Ramsey

Annuals, 1–3 (–5) cm. Stems decumbent to erect. Leaves basal and/or cauline; opposite (crowded, seemingly whorled); subsessile or ± petiolate; blades spatulate to oblanceolate, entire. Heads discoid, in clusters (of 2–5, congested, total heads to 100+). Involucres cylindric to obconic, 2 (–4) mm diam. Phyllaries 2 (–3) in 1 series (basally distinct or connate, oblong, herbaceous). Ray-florets 0. Disc-florets 2 (–3), bisexual, fertile; corollas white, pink, or purple, tubes slightly shorter than funnelform throats, lobes 5, deltate-ovate. Receptacles minute, epaleate. Cypselae cylindric to clavate, striate, glabrous; pappi falling, of ca. 20 basally connate, setiform to subulate, ± plumose scales (or flattened bristles). x = 7.

Distribution

w United States

Discussion

Species 1.

Selected References

None.

Lower Taxa

... more about "Dimeresia"
not tailed +, rounded +  and obtuse +
connate +  and distinct +
subequal +
scarious +
usually ovate +  and lanceolate +
usually deltate +  and lanceolate +
spiciform +, racemiform +, paniculiform +  and corymbiform +
indeterminate +  and determinate +
John L. Strother +
A. Gray in A. Gray et al. +
decurrent +
compound +  and simple +
spatulate;oblanceolate +
winged;ribbed;winged;ribbed +
tuberculate +  and rugose +
barbellulate +  and barbellate +
purple +, pink +  and white +
cylindric +  and clavate +
fertile +  and bisexual +
fertile +  and bisexual +
w United States +
Greek dimeres, in 2 parts or with 2 members, allusion unclear +
tomentose +  and glabrescent +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
indeterminate +
homogamous +  and heterogamous +
each +  and sessile +
2 cm20 mm <br />0.02 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
cylindric;obconic +
petiolate +  and subsessile +
cauline +  and basal +
deltate-ovate +
2-carpellate +
persistent +
in A. Gray et al., Syn. Fl. N. Amer. ed. +
styliferous +, neuter +  and pistillate +
bearing subulate enations +, hairy +  and bristly +
flat;conic or cylindric +
plumose +, setiform +  and subulate +
exalbuminous +
decumbent +  and erect +
appendaged +  and truncate +
hirsutulous +  and glabrous +
papillate +
Compositae +
Dimeresia +
Asteraceae (tribe Heliantheae) subtribe Dimeresiinae +
3 cm30 mm <br />0.03 m <br /> (5 cm50 mm <br />0.05 m <br />) +
1 cm10 mm <br />0.01 m <br /> (3 cm30 mm <br />0.03 m <br />) +
tree +, shrub +  and subshrub +