Federal Register / Vol. 62, No. 19 / Wednesday, January 29, 1997 / Rules and Regulations
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4172 Federal Register / Vol. 62, No. 19 / Wednesday, January 29, 1997 / Rules and Regulations 2. Section 22.935(f)(5) is revised to Ventura Field Office (see ADDRESSES Yucca whipplei (yucca), and the rare read as follows: section) (telephone: 805/644±1766; Cupressus forbesii (Tecate cypress). facsimile: 805/644±3458). Dudleya abramsii ssp. parva commonly § 22.935 Procedures for comparative occurs in a cactus-dominated coastal renewal proceedings. SUPPLEMENTARY INFORMATION: sage scrub, which provides nesting * * * * * Background habitat for the rare Bell's sage sparrow (f) * * * Astragalus brauntonii (Braunton's (Amphispiza belli belli) and rufous- (5) Parties will have 30 days in which crowned sparrow (Amophila ruficeps). to file exceptions to the Initial Decision. milk-vetch), Pentachaeta lyonii (Lyon's pentachaeta), Dudleya abramsii ssp. Most of the coastal sage scrub where [FR Doc. 97±1699 Filed 1±28±97; 8:45 am] parva (Conejo dudleya), Dudleya Dudleya verityi occurs is dominated by BILLING CODE 6712±01±M cymosa ssp. marcescens (marcescent Artemisia californica (coastal dudleya), Dudleya cymosa ssp. sagebrush), Eriogonum fasciculatum ovatifolia (Santa Monica Mountains (wild buckwheat), Salvia leucophylla DEPARTMENT OF THE INTERIOR dudleya), and Dudleya verityi (Verity's (purple sage), and occasionally dudleya) are located around the Los Coreopsis gigantea (giant coreopsis). Fish and Wildlife Service Angeles basin, California. The lowland Dudleya verityi is associated with the plains are bounded by mountains and rare Eriogonum crocatum (Conejo 50 CFR Part 17 hills that expose Mesozoic or older buckwheat) and Dudleya blochmaniae ssp. blochmaniae (Blochman's dudleya). RIN 1018±AB88 basement rocks and sedimentary and A unique lichen flora of over 70 species igneous rocks of late Cretaceous to late is associated with Dudleya verityi and Endangered and Threatened Wildlife Pleistocene age. The southern portion of coastal sage scrub habitat on Conejo and Plants; Determination of the Transverse Ranges forms the Mountain (Riefner 1992). The grassland Endangered Status for Two Plants and northern and western boundary of the habitat in which Pentachaeta lyonii Threatened Status for Four Plants basin and includes the San Gabriel occurs is largely dominated by From Southern California Mountains, the Santa Monica introduced old world grass and herb Mountains, and the Simi Hills. The AGENCY: Fish and Wildlife Service, genera such as Avena, Brassica, Bromus, Santa Ana Mountains at the northern Interior. Centaurea, and Erodium. Several native end of the Peninsular Ranges border the ACTION: Final rule. plant species are present in these southern region of the basin. grasslands, including the bunch grass Strong substrate preferences are SUMMARY: The U.S. Fish and Wildlife Nassella pulchra. Service (Service) determines exhibited by all of the taxa included in endangered status for Astragalus this rule. Populations of Astragalus Discussion of the Six Plant Taxa brauntonii (Braunton's milk-vetch) and brauntonii are only known to occur on Astragalus brauntonii was first Pentachaeta lyonii (Lyon's pentachaeta) small limestone outcrops. Pentachaeta collected in 1901 by Ernest Braunton and threatened status for Dudleya lyonii is found on clay soils in ecotonal near Sherman (now called West abramsii ssp. parva (Conejo dudleya), areas between grasslands and Hollywood), Los Angeles County. Dudleya cymosa ssp. marcescens shrublands. All of the dudleyas occur Samuel B. Parish described it two years (marcescent dudleya), Dudleya cymosa on volcanic or sandstone rock outcrops later as Astragalus brauntonii. In 1929, ssp. ovatifolia (Santa Monica Mountains with specific microhabitat Per Axel Rydberg published the name dudleya), and Dudleya verityi (Verity's characteristics. Dudleya verityi and Brachyphragma brauntonii in his dudleya). These taxa occur in grassland, Dudleya abramsii ssp. parva occur revision of the genus; however, this chaparral, or coastal sage scrub habitats exclusively on the outcrops and soils name was not recognized by most in the mountains surrounding the Los derived from the Miocene Conejo botanists. Rupert Barneby recognized Angeles basin, California. The six plants volcanics at the western end of the Simi the name Astragalus brauntonii in his are threatened by one or more of the Hills and the Santa Monica Mountains. Atlas of North American Astragalus followingÐurban development, Dudleya cymosa ssp. marcescens (Barneby 1964). Astragalus brauntonii is recreational activities, alteration of fire occupies the lower slopes of volcanic included in the current edition of The cycles and fire suppression activities, cliffs in canyons that have perennial Jepson Manual (Spellenberg 1993). overcollecting, habitat fragmentation moisture. Dudleya cymosa ssp. Astragalus brauntonii is a robust, and degradation, and competition from ovatifolia is found on rock outcrops short-lived perennial in the pea family invasive weeds. Several of the plants are with forms specific to sedimentary (Fabaceae). It is one of the tallest also threatened by naturally occurring conglomerate or volcanic breccia (Nakai members of the genus, reaching a height events by virtue of their small numbers 1987, Natural Diversity Data Base of 15 decimeters (dm) (60 inches (in.)) and population sizes. This rule (NDDB) 1994). and is covered with woolly hairs. A implements the protection and recovery Most of the major habitat types in thick taproot and woody basal stem provisions provided by the Endangered which these rare plants occur are gives rise to several to many stems. The Species Act (Act) for these plants. considered sensitive by the botanical 4 to 16 centimeter (cm) (1.5 to 6.5 in.) community in California. Large scale long leaves are pinnately compound EFFECTIVE DATE: February 28, 1997. loss of habitat, fragmentation, and with 25 to 33 oblong-ovate, abruptly ADDRESSES: The complete file for this alteration of natural ecosystem pointed leaflets. The light purple rule is available for inspection by processes have resulted from flowers are clustered in 35- to 60- appointment during normal business development, fire suppression activities, flowered racemes 4 to 14 cm (1.5 to 5.5 hours at the Ventura Field Office, U.S. cattle grazing, and vegetation type in.) long. The beaked, slightly curved Fish and Wildlife Service, 2493 Portola conversion by agricultural practices pods are oblong-ovoid and 6.5 to 9 Road, Suite B, Ventura, California (Schoenherr 1989). Astragalus millimeters (mm) (2.5 to 3.5 in.) long. 93003. brauntonii is associated with the fire- Astragalus brauntonii is readily FOR FURTHER INFORMATION CONTACT: Carl dependent chaparral habitat dominated distinguished from the only other Benz, Assistant Field Supervisor, by Adenostoma fasciculatum (chamise), perennial species of Astragalus in the Federal Register / Vol. 62, No. 19 / Wednesday, January 29, 1997 / Rules and Regulations 4173 area, A. trichopodus, by being woolly as known population ever recorded was curled and the leaves are narrowly opposed to strigose (covered with sharp, approximately 400 individuals (Orange linear with ciliate margins (Van Horn stiff-appressed hairs) or glabrous County) in 1985 following a fire in 1982. 1973). There are no other members of (without hairs), and by having two- No plants remain there today. Nearby the genus in the region. chambered rather than one-chambered habitat for A. brauntonii in the Pentachaeta lyonii occupies pocket pods (Barneby 1964). Cleveland National Forest was surveyed grassland sites that intergrade with Astragalus brauntonii is considered a by endangered plant specialists from the shrublands, and the edges of roads and limestone endemic; the only Rancho Santa Ana Botanic Garden, but trails. Species typically associated with populations not found on limestone are no plants were found (Mistretta 1992). P. lyonii include Chorizanthe staticoides on down-wash sites (seed drift The remaining populations contain no (turkish rugging), Calochortus catalinae following a fire event), an occurrence more than approximately 20 to 30 (Catalina mariposa lily), Nassella along the edge of a fire road in individuals and the current total pulchra (purple needle-grass), and Monrovia, and at a location in Chino number of individuals is estimated to be annual members of the phlox family Hills (Sampson 1985) where the fewer than 100. The seed bank for A. (Polemoniaceae) (Thomas and Danielsen substrate type is unknown. Surveys for brauntonii may have the capability of 1984). Habitat of P. lyonii is A. brauntonii during post-fire floristic generating approximately 1,000 characterized by a low percentage of inventories within its known individuals in 4 highly subdivided total plant cover and exposed soils with distribution on substrates other than populations. a microbiotic crust (Belnap 1990), limestone have, to date, failed to Most of the habitat of Astragalus partially assisting in reducing indicate its presence on non-limestone brauntonii is on private land in areas competition with other species. Rodents soils. The potential occurrence of A. with expanding development. Four (Perognathus spp. and Peromyscus spp.) brauntonii on non-limestone soils public agencies, the California and harvester ant colonies should not be discounted; however, it is Department of Parks and Recreation (Pogonomyrex spp.) also control the quite conspicuous and would be easily (DPR), the Conejo Open Space density of associated vegetation detected. Limestone outcrops are Conservation Agency (COSCA), the