Hemizonella

{{Short description|Genus of flowering plants}}

{{Speciesbox

|image = Hemizonella minima imported from iNaturalist photo 802216 on 2 April 2021.jpg

|display_parents = 4

|genus = Hemizonella

|parent_authority = (A.Gray) A.Gray

|species = minima

|authority = A.Gray

|synonyms_ref = [http://www.tropicos.org/Name/40023890 Tropicos, Hemizonella (A. Gray) A. Gray ]

|synonyms=

• Hemizonia § Hemizonella A. Gray
• Hemizonia minima A.Gray
• Harpaecarpus minimus (A.Gray) Greene
• Melampodium minimum (A.Gray) M.E.Jones
• Madia minima (A.Gray) D.D.Keck

}}

Hemizonella is a genus of North American plants in the tribe Madieae within the family Asteraceae.[https://www.biodiversitylibrary.org/page/5465525#page/197/mode/1up Gray, Asa. 1874. Proceedings of the American Academy of Arts and Sciences 9: 189][http://www.efloras.org/florataxon.aspx?flora_id=1&taxon_id=115085 Flora of North America Vol. 21 Page 296, Hemizonella (A. Gray) A. Gray]

The only known species is Hemizonella minima (opposite-leaved tarweed),{{PLANTS|id=HEMI20|taxon=Hemizonella minima|accessdate=14 May 2015}} native to British Columbia, Washington, Oregon, California, Montana, Idaho, Nevada[https://archive.today/20150119174519/http://dixon.iplantcollaborative.org/CompositaeWeb/default.aspx?Page=NameDetails&TabNum=0&NameId=74bc9a31-7ce2-4a1d-a0b3-4f81e9d8b39a Flann, C (ed) 2009+ Global Compositae Checklist ]Hemizonella bonap

The plant grows in many types of forest, scrub, and chaparral habitats, from mountains to deserts. It is found in the Sierra Nevada and Cascade Range, and Mojave Desert.

Hemizonella minima is a small annual herb producing a thin, fuzzy stem up to about {{convert|15|cm|in}} in maximum height. The pointed, hairy leaves are no more than {{convert|2.5|cm|in}} long. The inflorescence produces one or more tiny flower heads which are oblong or shaped like tops on close inspection. Each is a few millimeters wide, enclosed in phyllaries studded with stalked resin glands, and tipped with minute yellowish florets. The fruit is an achene a few millimeters long with no pappus.