CNPS.ORG Inventory of Rare and Endangered Plants - 7th edition interface
v7-18jan 1-22-18
Status: record howellia_aquatilis - Thu, Feb. 22, 2018 15:50 ET c
Howellia aquatilis
common namewater howellia
CalPhotos image
more photos
© 2005 Dieter Wilken  Follow image link for photo data.
life formannual herb aquatic
CA Rare Plant Rank
List 2B.2
LIST 2B: Rare, threatened, or endangered in California, but more common elsewhere.
     0.2: Fairly endangered in California
state rank
S2      ranking system key
global rank
G3     G3: 21-80 occurrences or 3,000-10,000 individuals OR 10,000-50,000 acres
Where did the "RED" code go?
CA state listingNone  
federal listingThreatened  07/14/94
where found
MAPS - Use v8 link below.

Topographic quads (6):
Buck Rock (597B) 3912288, Leech Lake Mountain (598A) 3912381, Zenia (615B) 4012324, Alderpoint (616A) 4012325, Fort Seward (616B) 4012326, Black Lassic (634D) 4012335
quad data info

Counties, states, regions:
Humboldt (HUM), Mendocino (MEN), Trinity (TRI), Idaho (ID), Montana (MT), Oregon (OR)*, Washington (WA)
A reminder: Species not recorded for a given area may nonetheless be present, especially where favorable conditions occur.
CNPS habitats•Marshes and swamps (MshSw)(freshwater)
blooming period Jun  
elevation range1085 - 1290 meters
Rediscovered in CA in 1996 by D. Isle and D. Efseaff; now known in CA from six extant occurrences. Previously known in CA from only a single collection near Howard Lake in 1928; where possibly extirpated by cattle grazing and trampling. Threatened by hydrological alteration, grazing, and trampling. Endangered in ID and OR, and state-listed as Threatened in WA. Inadvertently omitted from The Jepson Manual. See Proceedings of the American Academy of Arts and Sciences 15:43 (1879) for original description, Wasmann Journal of Biology 33:90-91 (1975) for the CA record, Conservation Biology 2(3):275-282 (1988) for ecological information, and Fremontia 25:3 (1997) for account of rediscovery.
full nameHowellia aquatilis Gray
Version 8    INVENTORY VERSION 8 interface for this taxon, including GIS and more links

Additional information:
standard acronym  HOAQ Element Code  PDCAM0A010
CalFlora species this taxon    CalFlora genus related taxa
Jepson Online Jepson Interchange  Jepson Manual and other resources
Google search
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Suggested citation: California Native Plant Society (CNPS). 2018. Inventory of Rare and Endangered Plants (online edition, v7-18jan). California Native Plant Society. Sacramento, CA. Accessed on Thu, Feb. 22, 2018 from

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