A review of Sedum section Gormania (Crassulaceae) in western North America Author Zika, Peter F. WTU Herbarium, Box 355325, University of Washington, Seattle, Washington 98195 - 5325, U. S. A. E-mail: zikap 941 @ gmail. com zikap941@gmail.com Author Wilson, Barbara L. Carex Working Group, 2250 NW 13 Street, Corvallis, Oregon 97330, U. S. A. E-mail: bwilson @ peak. org bwilson@peak.org Author Brainerd, Richard E. Carex Working Group, 2250 NW 13 Street, Corvallis, Oregon 97330, U. S. A. E-mail: bwilson @ peak. org bwilson@peak.org Author Otting, Nick Carex Working Group, 2250 NW 13 Street, Corvallis, Oregon 97330, U. S. A. E-mail: bwilson @ peak. org bwilson@peak.org Author Darington, Steven PO Box 6112, Eureka, California 95502 - 6112, U. S. A. E-mail: sdarington @ gmail. com sdarington@gmail.com Author Knaus, Brian J. Horticultural Crop Research Unit, United States Department of Agriculture, Agricultural Research Service, Corvallis, OR 97330, U. S. A. E-mail: brian. knaus @ ars. usda. gov brian.knaus@ars.usda.gov Author Nelson, Julie Kierstead WTU Herbarium, Box 355325, University of Washington, Seattle, Washington 98195 - 5325, U. S. A. E-mail: zikap 941 @ gmail. com & Shasta-Trinity National Forest, 3644 Avtech Parkway, Redding, CA 96002, U. S. A. E-mail: jknelson @ fs. fed. us & WTU Herbarium, Box 355325, University of Washington, Seattle, Washington 98195 - 5325, U. S. A. E-mail: zikap 941 @ gmail. com zikap941@gmail.com text Phytotaxa 2018 2018-09-10 368 1 448 450 http://dx.doi.org/10.11646/phytotaxa.368.1.1 journal article 10.11646/phytotaxa.368.1.1 1179-3163 13704629 2. Sedum citrinum Zika (2014: 112) . Figs. 2A–B , 5A , 8B , 9A , 11A , 23 , 24A . Type: — UNITED STATES . California : Del Norte Co. , ridge N of South Red Mountain , 1050 m , 9 June 2013 , P . F . Zika 26185 ( holotype , WTU ; isotypes , BH , CAS , GH , MO , OSC , RSA , UC , US ) . FIGURE 23. Sedum citrinum , Del Norte Co. , California.A. Habit ( Zika 26611 & Brainerd ). B. Inflorescence nodded in bud, rosettes were loose ( Zika 26193 ). C. Rosette leaves, lower row; stem leaves, upper row ( Zika 25930 ). D–E. Deep yellow flowers with spreading narrow petals, yellow anthers faded white. D. Zika 26619 & Brainerd . E. Zika 26620 & Brainerd . Additional specimens examined :— UNITED STATES . CALIFORNIA . Del Norte County : near Red Mountain lookout, 1220 m , 26 June 1979 , Overton & Butler 6664 ( HSC ); N of South Red Mountain , 1050 m , 24 June 2012 , Zika 25930 ( HSC , JEPS , SBBG , UCR ); same site, 9 June 2014 , Zika 26611 & Brainerd ( OSC , WTU ); NNW of South Red Mountain , 1210 m , 24 June 2012 , Zika 25931 ( DAV , MO , NY , US ); same site, 9 June 2013 , Zika 26193 ( BH , CAS , WTU ) ; NW of South Red Mountain , 1235 m , 9 June 2013 , Zika 26201 ( BH , CAS , RSA , WTU ); N of Red Mountain , 1190 m , 10 June 2014 , Zika 26619 & Brainerd ( WTU ) ; Turwar Creek drainage, NNW of Red Mountain Lookout , 1235 m , 10 June 2014 , Zika 26615 & Brainerd ( HSC , RSA, US ); same site, 940 m , 10 June 2014 , Zika 26620 & Brainerd ( OSC , WTU ) . FIGURE 24. Inflorescence comparison between Sedum citrinum , S. kiersteadiae , and S. rubiginosum . All three species with narrow spreading yellow petals. A. Sedum citrinum , inflorescence with elongated lower branches, flat-topped, Del Norte Co., California ( Zika 25930 ). B. Sedum kiersteadiae , cylindrical and loose inflorescence, individual flowers easily seen, Shasta Co. , California ( Zika 26294 ). C–D. Sedum rubiginosum , cylindrical and dense inflorescence, individual flowers less easily distinguished, Tehama Co., California ( Zika 25522 & J.K. Nelson ). Distribution and ecology :— Sedum citrinum was endemic to gently sloping ultramafic outcrops and meadows at elevations of 940–1275 m in southern Del Norte County, California , where it was recorded from a few populations within an area of fifteen square km near South Red Mountain ( Fig. 22 ), in the western Klamath Ranges ecoregion (Jepson eFlora 2017). Its ecology was summarized in Zika (2014) . Notes :— Sedum citrinum ( Fig. 23 ) had thick obovate rosette leaves and thick oblong to elliptic or obovate stem leaves ( Fig. 5A ). The sepals were relatively short ( Fig. 9A ). The petals were deep yellow, narrow, and strongly spreading, often to 90° from the flower axis ( Figs. 8B , 11A ). Fresh anthers were yellow, aging to yellow, white, brown, or orange. The inflorescences were flat-topped or rounded, with elongate lower branches, not columnar or cylindrical as in the closely related species S. kiersteadiae and S. rubiginosum ( Fig. 24 ). The three taxa were allopatric. Sedum citrinum was similar to the recently described S. kiersteadiae , a more widespread species of the Cascade Range Highlands and Klamath Ranges ecoregions (Jepson eFlora 2017), from Siskiyou County, south to Trinity and Shasta counties ( Fig. 25 , Wilson et al . 2014 ). Both had narrow, widely spreading, yellow petals and vegetative shoots with well-spaced leaves in open rosettes. Sedum citrinum differed from S. kiersteadiae in inflorescence shape and also in flower color, which was paler in S. kiersteadiae . Sedum citrinum was also similar to S. rubiginosum of Tehama County, California . The latter was restricted to the extreme southern tip of the Klamath Ranges ecoregion, 150 km southeast of S. citrinum ( Fig. 25 ), and had dense rosettes with larger, columnar inflorescences with more numerous and more densely crowded flowers.