Difference between revisions of "Asteraceae (tribe Heliantheae) subtribe Dimeresiinae"
Phytologia 41: 40. 1978.
FNA>Volume Importer |
FNA>Volume Importer |
||
| Line 41: | Line 41: | ||
|publication year=1978 | |publication year=1978 | ||
|special status= | |special status= | ||
| − | |source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/ | + | |source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/f50eec43f223ca0e34566be0b046453a0960e173/coarse_grained_fna_xml/V19-20-21/V21_447.xml |
|tribe=Asteraceae tribe Heliantheae | |tribe=Asteraceae tribe Heliantheae | ||
|subtribe=Asteraceae (tribe Heliantheae) subtribe Dimeresiinae | |subtribe=Asteraceae (tribe Heliantheae) subtribe Dimeresiinae | ||
Revision as of 20:37, 16 December 2019
Annuals, 1–3(–5) cm. Leaves basal and/or cauline; opposite (crowded); subsessile or ± petiolate; blades oblanceolate to spatulate, margins entire, faces tomentose to glabrescent, often gland-dotted. Heads discoid, usually (2–5) in congested clusters (clusters often crowded, total heads top 100+). Calyculi 0. Involucres cylindric to obconic. Phyllaries persistent, 2–3 in 1 series (oblong, subequal, herbaceous, basally connate or distinct). Receptacles flat (minute), epaleate. Ray florets 0. Disc florets 2–3, bisexual, fertile; corollas white, pink, or purple, tubes shorter than funnelform throats, lobes 5, deltate-ovate; anther thecae pale; stigmatic papillae in 2 lines. Cypselae cylindric to clavate, fine-ribbed, glabrous; pappi soon falling (all together), of ca. 20, basally connate, setiform to subulate, ± plumose scales (or flattened bristles).
Distribution
w United States.
Discussion
Genus 1, species 1.
The sole genus of Dimeresiinae was originally placed in a broadly circumscribed Inuleae. H. Robinson (1981) suggested possible relationships with Galinsoginae and/or Helianthinae. B. G. Baldwin et al. (2002) positioned Dimeresia in Chaenactideae with Chaenactis and Orochaenactis as the other two genera in the tribe.
Selected References
None.