Species Details

Howellia aquatilis

water howellia

  Download Report   Calflora     eFlora     CCH     CalPhotos
Photo of Howellia aquatilis
©2018 John Doyen
Photo of Howellia aquatilis
©2018 John Doyen
Photo of Howellia aquatilis
©2018 John Doyen
Scientific Name:
Howellia aquatilis Gray
Common Name:
water howellia
Family: Campanulaceae
Element Code: PDCAM0A010
USDA Plants Symbol: HOAQ
Synonyms/Other Names:
CA Rare Plant Rank: 2B.2
Fed List: FD (1994-07-14)
State List: None
Global Rank: G3
State Rank:
Other Status:
CRPR Changes:
changed from 2.2 to 2B.2 on 2013-06-12
Add Date: 1974-01-01
Date Edited: 2022-03-01
Lifeform: annual herb (aquatic)
Blooming Period: Jun
1085 - 1290 meters
3560 - 4230 feet
General Habitat:
  • Marshes and swamps (freshwater)
General Micro Habitat:
Micro Habitat:
Rediscovered in CA in 1996 by D. Isle and D. Efseaff. Previously known in CA from only a single collection near Howard Lake in 1928; where possibly extirpated by cattle grazing and trampling. Endangered in ID and OR, and state-listed as Threatened in WA.

Threatened by hydrological alteration, grazing, and trampling.


Inadvertently omitted from The Jepson Manual.

Total Occurrences: 7
Element Occurrence Ranks:
2 2 1 0 0 2
Occurrence Status:
Historical >20 Years 1
Recent <=20 Years 6
Presumed Extant 7
Possibly Extirpated 0
Presumed Extirpated 0
California Endemic:
California Island:
States: Name (Code)
California (CA), Idaho (ID), Montana (MT), Oregon (OR)*, Washington (WA)
California Counties and Islands: Name (Code)
Humboldt (HUM), Mendocino (MEN), Trinity (TRI)
Quads: Name (Quad Code)
Alderpoint (4012325), Black Lassic (4012335), Buck Rock (3912288), Fort Seward (4012326), Leech Lake Mtn. (3912381)
Definitions of codes following a county and/or quad:
* Presumed extirpated
(?) Occurrence confirmed, but possibly extirpated
Quad and county data is imported from the CNDDB. Species may be present in other areas where conditions are favorable. These data should NOT be substituted for pre-project review or for on-site surveys.


Presumed Extant
Counties   Quads
Original Description: Proceedings of the American Academy of Arts and Sciences 15:43 (1879)
Species Account: Howellia aquatilis profile for potential Species of Conservation Concern evaluation (2018)
Other: Wasmann Journal of Biology 33:90-91 (1975) [CA record]
Other: Conservation Biology 2(3):275-282 (1988) [Ecological information]
Other: Fremontia 25:3 (1997) [Account of rediscovery]