Skip to Content


Endangered and Threatened Wildlife and Plants; 90-day Finding on a Petition To Delist Tuctoria mucronata

Document Details

Information about this document as published in the Federal Register.

Published Document

This document has been published in the Federal Register. Use the PDF linked in the document sidebar for the official electronic format.

Start Preamble


Fish and Wildlife Service, Interior.


Notice of 90-day petition finding.


We, the U.S. Fish and Wildlife Service (Service), announce a 90-day finding for a petition to remove Tuctoria mucronata (Solano grass), throughout its range, from the Federal list of threatened and endangered species, pursuant to the Endangered Species Act of 1973, as amended (ESA). We reviewed the petition and supporting documentation, information in our files, and other available information, and find that there is not substantial information indicating that delisting of T. mucronata may be warranted. We will not be initiating a further status review in response to the petition to delist. We ask the public to submit to us any new information that becomes available concerning the status of this species. This information will help us monitor and encourage the conservation of this species.


The finding announced in this document was made on February 5, 2003. You may submit new information concerning this species for our consideration at any time.


Data, information, written comments and materials, or questions concerning this petition and finding should be submitted to the Field Supervisor, Sacramento Fish and Wildlife Office, U.S. Fish and Wildlife Service, 2800 Cottage Way, Room W-2605, Sacramento, CA 95825. The petition finding and supporting data are available for public inspection, by appointment, during normal business hours at the above address.

Start Further Info


Ken Fuller, Botanist, at the above address, or telephone 916/414-6645.

End Further Info End Preamble Start Supplemental Information



We listed Tuctoria mucronata as an endangered species in 1978 (43 FR 44810). At the time, T. macronata was known to exist only as a single population found at its type locality (the location where it was first discovered) at Olcott Lake, in Solano County, CA. We proposed critical habitat for T. mucronata, and 10 other vernal pool plant species, on September 24, 2002 (67 FR 59884). Tuctoria mucronata is an obligate vernal pool annual species.

The petition to delist Tuctoria mucronata, dated February 3, 1997, was submitted by Rob Gordon, representing the National Wilderness Institute. The petition requested we remove T. mucronata from the List of Endangered and Threatened Wildlife and Plants based upon data error.

Section 4(b)(3)(A) of the ESA (16 U.S.C. 1531 et seq.) requires that we make a finding on whether a petition to list, delist, or reclassify a species presents substantial scientific or commercial information indicating that the petitioned action may be warranted. We base the finding on all information available to us at the time the finding is made. To the maximum extent practicable, we make this finding within 90 days of receipt of the petition, and promptly publish notice of the finding in the Federal Register. If we find that substantial information was presented, we are required to promptly commence a review of the status of the species, if one has not already been initiated (50 CFR 424.14).

The factors for listing, delisting, or reclassifying species are described at 50 CFR 424.11. We may delist a species only if the best scientific and commercial data available substantiate that it is neither endangered nor threatened. Delisting may be warranted as a result of: (1) Extinction; (2) recovery; or (3) a determination that the original data used for classification of the species as endangered or threatened were in error.

In response to the petitioner's request to delist Tuctoria mucronata, we sent a letter to the petitioner on June 29, 1998, explaining our inability to act upon the petition due to low priorities assigned to delisting petitions in accordance with our Listing Priority Guidance for Fiscal Year 1997, which was published in the Federal Register on December 5, 1996 (61 FR 64475). That guidance identified delisting activities as the lowest priority (Tier 4). Due to the large number of higher priority listing actions and a limited listing budget, we did not conduct any delisting activities during the Fiscal Year 1997. On May 8, 1998, we published the Listing Priority Guidance for Fiscal Years 1998-1999 in the Federal Register (63 FR 25502) and, again, placed delisting activities at the bottom of our priority list. Since 1998, higher priority work has not allowed us to examine or act upon the petition to delist T. mucronata.


The petition cited our 1993 Fiscal Year Budget Justification as its supporting information that the species should be removed from the List of Endangered and Threatened Wildlife and Plants based on data error. The 1993 Fiscal Year Budget Justification stated that we would evaluate those species identified as approaching the majority of their recovery objectives. Tuctoria mucronata was identified as one of 33 species approaching its recovery objectives, as found in our December 1990 Report to Congress: Endangered and Threatened Species Recovery Program. The 1993 Fiscal Year Budget Justification identified the need to evaluate those species, including T. mucronata, and determine the appropriateness of delisting them based on status surveys.

Our Delta Green Ground Beetle and Solano Grass Recovery Plan (Service 1985) states that recovery will be achieved by protecting the known population of the species and by establishing three additional, secure populations within the two protected large vernal lakes and their watersheds in the vicinity of the Jepson Prairie Preserve. Recovery would be achieved when these populations are secure and sustainable for a period of 15 consecutive years. Given that Tuctoria mucronata was last seen in 1993 at its original location when four individual plants were present, we are concerned that the population is possibly extirpated from its type locality. A second population of T. mucronata was discovered on private lands in 1985, and another population of T. mucronata was discovered in 1993 on a former U.S. Air Force Base communication facility that is being transferred to the Yolo County Parks Department. Several thousand individual plants of T. mucronata were seen at this site in 2000. We do not have sufficient additional populations protected in enough preserves specifically established for protection and management of the species or protected under conservation easements and managed for the conservation of the species to meet our recovery objectives.

The petitioner also stated that “other new scientific information gathered since the time of listing which is in possession of the Service,” supports delisting due to data error. However, the petition did not identify this new scientific information. In addition, the Start Printed Page 13944petitioner did not include any detailed narrative justification for the delisting or provide information regarding the status of the species over all or a significant portion of its range or include any persuasive supporting documentation for the recommended administrative measure to delist Tuctoria mucronata. While we have identified two additional populations since we listed the species, these two populations do not meet the recovery plan criteria for downlisting or delisting; in addition, the original population appears to be extirpated. We have found no evidence or data in our files or in the petition that indicates a data error was committed in listing T. mucronata or that otherwise supports the petitioned action.

Threats to Tuctoria mucronata include alteration of hydrology, excessive livestock grazing, recreational uses, and competition from non-native plants (California Natural Diversity Database 2002). As of 1999, the status of T. mucronata is declining (California Department of Fish and Game 2001). Thus, we do not possess any data that suggest T. mucronata was listed in error, and the species has not achieved sufficient recovery objectives to be considered for either downlisting to threatened status or delisting.


We have reviewed the petition and its supporting documentation, information in our files, and other available information. We find that there is not substantial information indicating that delisting of Tuctoria mucronata may be warranted.

Information Solicited

When we find that there is not substantial information indicating that the petitioned action may be warranted, initiation of a status review is not required by the ESA. However, we regularly assess the status of species listed as threatened or endangered and welcome any information concerning the status of Tuctoria mucronata. Submit any information at any time to the Field Supervisor, Sacramento Fish and Wildlife Office (see ADDRESSES).

References Cited

California Department of Fish and Game. 2001. The Status of Rare, Threatened and Endangered Animals and Plants of California. 226 pp

California Natural Diversity Database. 2002. An electronic database hosted by the California Department of Fish and Game, Habitat Conservation Division, Sacramento California

U.S. Fish and Wildlife Service. 1985. Delta Green Ground Beetle and Solano Grass Recovery Plan. U.S. Fish and Wildlife Service, Portland, Oregon. 68 pp.


The primary author of this document is Ken Fuller, Botanist, Sacramento Fish and Wildlife Office, U.S. Fish and Wildlife Service (see ADDRESSES section).


The authority for this action is the Endangered Species Act of 1973 as amended (16 U.S.C. 1531 et seq.).

Start Signature

Dated: February 5, 2003.

Steve Williams,

Director, Fish and Wildlife Service.

End Signature End Supplemental Information

[FR Doc. 03-6793 Filed 3-20-03; 8:45 am]