Taxon Report

Hemizonia congesta DC. ssp. tracyi Babc. & Hall

Tracy's tarplant

Print Report


© 2016 Steve Matson

Taxon Summary

Hemizonia congesta ssp. tracyi, commonly known as Tracy's tarplant, is a annual herb in the Asteraceae that is found only in California. It occurs within Coastal prairie, Lower montane coniferous forest, and North Coast coniferous forest, growing at elevations from 120 to 1200 meters. Hemizonia congesta ssp. tracyi is ranked 4.3, Plants of Limited Distribution, A Watch List; Not very threatened in California.

  Classification
Scientific Name:
 Hemizonia congesta DC. ssp. tracyi Babc. & Hall
Common Name:
 Tracy's tarplant
Family: Asteraceae
Element Code: PDAST4R067
USDA Plants Symbol: HECOT
Synonyms/Other Names:
  • Hemizonia tracyi (Babc. & Hall) Keck

Ecology and Life History
Lifeform: annual herb
Blooming Period: (Mar-Apr)May-Oct (Mar-Apr)May-Oct
Elevation: 120-1200 (395-3935)
General Habitats: Coastal prairie, Lower montane coniferous forest, North Coast coniferous forest
Microhabitat: Openings, Serpentine (sometimes)
Microhabitat Details:

Conservation Status
CA Rare Plant Rank: 4.3
Global Rank: G5T4
State Rank:
 S4
State List: None
Fed List: None
Other Status:
CRPR Changes:

Occurrence Data from the CNDDB
Total Occurrences: 0
Element Occurrence Ranks:
   Excellent (A) 0
   Good (B) 0
   Fair (C) 0
   Poor (D) 0
   None (X) 0
   Unknown (U) 0

Location
California Endemic:  True
California Counties and Islands: Name (Code)
Humboldt (HUM), Mendocino (MEN), Trinity (TRI)
Quads: Name (Quad Code)
Alderpoint (4012325), Bald Hills (4112328), Bell Springs (3912385), Black Lassic (4012335), Blocksburg (4012336), Boonville (3912313), Briceland (4012318), Bridgeville (4012347), Buckeye Mtn. (4012432), Burbeck (3912344), Cape Mendocino (4012444), Capetown (4012443), Dinsmore (4012345), Fort Seward (4012326), Fortuna (4012452), Garberville (4012317), Hydesville (4012451), Iaqua Buttes (4012368), Ironside Mtn. (4012374), Korbel (4012378), Larabee Valley (4012346), Laughlin Range (3912333), Leggett (3912376), Longvale (3912354), Lord-ellis Summit (4012387), Mad River Buttes (4012367), Maple Creek (4012377), Miranda (4012327), Myers Flat (4012337), Noble Butte (3912386), Noyo Hill (3912346), Ornbaun Valley (3812383), Owl Creek (4012358), Petrolia (4012433), Philo (3912314), Redcrest (4012348), Salyer (4012385), Scotia (4012441), Shannon Butte (4012323), Sims Mountain (4012365), Weott (4012338), Yager Junction (4012357), Zenia (4012324)

Threat List Data from the CNDDB

Threat List Total: 0
EOs with Threat Listed: Total EOs % of EOs
0 0 %

Notes
Threats:
Taxonomy:

Selected References

Citation California Native Plant Society, Rare Plant Program. 2025. Rare Plant Inventory (online edition, v9.5.1). Website https://www.rareplants.cnps.org [accessed 3 October 2025].