Diablo helianthella
Family:Asteraceae
Helianthella castanea
Rarity
CNPS-EB: *A2
State CNPS: 1B.2
Global Rank: G2
CNDDB Rank: S2
83 current natural populations
Criteria:- Small Geographical Range
- Small Populations
Observations
Ecology
Flowers April - June
Habitats:
- Chaparral
- Grassland (Annual or Perennial)
- Woodland
All Helianthella
- H. californica var. californica (A2)
- H. castanea
Populations
Key| Location | Pop ID | Last Recorded | Notes |
|---|---|---|---|
| Berkeley Hills | 91 | 2001-12-31 | |
| Black Diamond - Markley Canyon | 1 | 2020-02-02 | |
| Black Diamond - Markley Canyon | 2 | 2009-05-11 | |
| Black Diamond - Sommersville | 3 | 2023-05-24 | |
| Briones Reservoir, EBMUD | 11 | 2006-08-22 | |
| Briones Reservoir, EBMUD | 120 | 2024-05-05 | |
| Briones Rgnl Park | 5 | 2021-04-14 | |
| Briones Rgnl Park | 6 | 2004-03-14 | |
| Briones Rgnl Park | 7 | 2005-03-05 | |
| Briones Rgnl Park | 8 | 2004-03-14 | |
| Briones Rgnl Park | 9 | 2023-05-14 | |
| Briones Rgnl Park | 10 | 2021-05-23 | |
| Briones Rgnl Park | 102 | 2024-04-17 | |
| Briones Rgnl Park | 103 | 2004-03-14 | |
| Briones Rgnl Park | 105 | 2022-01-30 | |
| Briones Rgnl Park | 108 | 2023-06-16 | |
| Briones Rgnl Park | 110 | 2023-04-15 | |
| Carquinez Strait Rgnl Park | 17 | 2008-04-13 | |
| Chabot Rgnl Park | 13 | 2022-03-06 | |
| Crockett | 111 | 2023-04-08 | |
| Crockett, West | 15 | 2023-06-01 | |
| Diablo Foothills Rgnl Park | 100 | 2022-03-03 | |
| EBMUD land on San Pablo Ridge | 84 | 2024-05-10 | |
| EBMUD land on San Pablo Ridge | 119 | 2024-04-28 | |
| Fairmont Ridge, near Lake Chabot | 69 | 2022-03-06 | |
| Franklin Canyon | 118 | 2024-04-16 | |
| Franklin Ridge | 78 | 2022-03-12 | |
| Kennedy Grove Rgnl Park | 72 | 2022-04-05 | |
| Lafayette - other or unknown sites | 56 | 2025-03-01 | |
| Lafayette - other or unknown sites | 71 | 2006-04-19 | |
| Lafayette Reservoir - EBMUD | 57 | 2014-05-12 | |
| Lafayette Ridge, Briones Rgnl Park | 4 | 2021-06-05 | |
| Lafayette Ridge, Briones Rgnl Park | 99 | 2022-03-18 | |
| Las Trampas Rgnl Wilderness | 46 | 2020-05-20 | |
| Las Trampas Rgnl Wilderness | 47 | 2022-05-09 | |
| Las Trampas Rgnl Wilderness | 48 | 2022-03-23 | |
| Las Trampas Rgnl Wilderness | 49 | 2023-05-20 | |
| Las Trampas Rgnl Wilderness | 50 | 2022-03-23 | |
| Las Trampas Rgnl Wilderness | 52 | 2023-05-20 | |
| Las Trampas Rgnl Wilderness | 54 | 2023-05-29 | |
| Las Trampas Rgnl Wilderness | 107 | 2023-05-20 | |
| Lime Ridge area | 41 | 2020-06-01 | |
| Lime Ridge area | 42 | 2023-05-12 | |
| Lime Ridge area | 43 | 2022-04-06 | |
| Lime Ridge area | 45 | 2015-03-19 | |
| Lime Ridge area | 106 | 2021-05-24 | |
| Lime Ridge area | 109 | 2023-05-12 | |
| Los Vaqueros Watershed | 67 | 2021-05-10 | |
| Moraga - other or unknown sites | 58 | 2009-04-17 | |
| Morgan Territory Rgnl Park | 65 | 2016-04-16 | |
| Morgan Territory Rgnl Park | 112 | 2024-04-15 | |
| Morgan Territory Rgnl Park | 114 | 2024-04-22 | |
| Morgan Territory Rgnl Park | 115 | 2024-04-22 | |
| Morgan Territory Rgnl Park | 116 | 2024-04-22 | |
| Morgan Territory Rgnl Park | 117 | 2024-04-22 | |
| Mt. Diablo State Park - North side | 37 | 2024-05-09 | |
| Mt. Diablo State Park - North side | 38 | 2009-05-13 | |
| Mt. Diablo State Park - South side | 16 | 2007-04-11 | |
| Mt. Diablo State Park - South side | 23 | 2022-03-05 | |
| Mt. Diablo State Park - South side | 24 | 2008-10-13 | |
| Mt. Diablo State Park - South side | 26 | 2021-10-02 | |
| Mt. Diablo State Park - South side | 27 | 2021-03-23 | |
| Mt. Diablo State Park - South side | 28 | 2024-06-01 | |
| Mt. Diablo State Park - South side | 95 | 2022-03-26 | |
| Mt. Diablo State Park - South side | 96 | 2022-03-26 | |
| Mt. Diablo State Park - South side | 97 | 2022-03-26 | |
| Mt. Diablo State Park - South side | 98 | 2022-04-20 | |
| Mt. Diablo State Park - South side | 104 | 2022-03-05 | |
| Mt. Diablo State Park - Summit and Upper area - 2500 ft and abo | 31 | 2021-05-06 | |
| Mt. Diablo State Park - Summit and Upper area - 2500 ft and abo | 32 | 2010-06-02 | |
| Mt. Diablo State Park - Summit and Upper area - 2500 ft and abo | 34 | 2015-04-25 | |
| Mt. Diablo State Park - West side | 94 | 2021-09-27 | |
| Mt. Wanda, Martinez | 75 | 2003-04-01 | |
| Pinole - other or unknown sites | 79 | 2004-03-12 | |
| Pinole - other or unknown sites | 80 | 2007-09-08 | |
| San Pablo Creek North - EBMUD | 82 | 2014-04-17 | |
| San Pablo Reservoir - EBMUD | 77 | 2006-04-28 | |
| Shell Ridge | 74 | 2016-05-13 | |
| Siesta Valley, Upper - EBMUD land | 88 | 2018-05-18 | |
| Tilden Rgnl Park - Grizzly Peak | 89 | 2003-05-26 | |
| Tilden Rgnl Park - other or unknown sites | 90 | 2003-12-31 | |
| Tilden Rgnl Park - San Pablo Ridge | 86 | 2003-05-09 | |
| Tilden Rgnl Park - San Pablo Ridge | 87 | 2022-04-03 | |
| Bishop Ranch Rgnl Park | 12 | 1992-03-29 | Historic |
| Chaparral Springs - S of Clayton | 18 | 1994-09-11 | Historic |
| Claremont Canyon Rgnl Park | 14 | 1901-05-07 | Historic |
| Clayton Ranch - SE of Clayton, EBRPD | 19 | 1998-12-31 | Historic |
| Danville | 61 | 1992-05-29 | Historic |
| Diablo Foothills Rgnl Park | 20 | 1994-12-31 | Historic |
| Dublin - South of 580, West of 680 | 60 | 1989-12-31 | Historic |
| EBMUD land near Orinda | 85 | 1996-05-05 | Historic |
| EBMUD land near Wildcat Rgnl Park | 81 | 1996-09-30 | Historic |
| EBMUD land on San Pablo Ridge | 83 | 2000-12-31 | Historic |
| Lafayette - other or unknown sites | 93 | 1990-05-11 | Historic |
| Las Trampas Rgnl Wilderness | 51 | 1991-06-06 | Historic |
| Las Trampas Rgnl Wilderness | 53 | 1991-06-06 | Historic |
| Leona Heights Rgnl Park, or nearby | 70 | 1999-12-31 | Historic |
| Lime Ridge area | 44 | 1998-05-10 | Historic |
| Lime Ridge area | 101 | 2000-05-14 | Historic |
| Mt. Diablo State Park - North side | 36 | 1991-05-18 | Historic |
| Mt. Diablo State Park - South side | 25 | 1990-07-15 | Historic |
| Mt. Diablo State Park - South side | 29 | 1994-12-31 | Historic |
| Mt. Diablo State Park - Summit and Upper area - 2500 ft and abo | 30 | 1995-05-08 | Historic |
| Mt. Diablo State Park - Summit and Upper area - 2500 ft and abo | 33 | 1991-04-21 | Historic |
| Mt. Diablo State Park - Summit and Upper area - 2500 ft and abo | 35 | 1990-04-22 | Historic |
| Mt. Diablo State Park - Summit and Upper area - 2500 ft and abo | 39 | 1994-12-31 | Historic |
| Mt. Diablo State Park - Summit and Upper area - 2500 ft and abo | 40 | 1993-12-31 | Historic |
| Mt. Diablo State Park - West side | 21 | 1992-04-03 | Historic |
| Mt. Diablo State Park - West side | 22 | 1999-12-31 | Historic |
| Pinole Peak - EBMUD | 76 | 1997-03-27 | Historic |
| Rocky Ridge - EBMUD land near Las Trampas | 55 | 1999-12-31 | Historic |
| Round Valley Rgnl Park | 66 | 1996-03-01 | Historic |
| San Leandro Reservoir - EBMUD | 59 | 1999-12-31 | Historic |
| Sobrante Ridge - S of Park | 73 | 1999-12-31 | Historic |
| Strawberry Canyon | 92 | 1979-12-31 | Historic |
| Tarraville Creek, Mines Rd | 68 | 1997-05-10 | Historic |