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Rare Plants Annual Report 2015

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Rare Plants Annual Report 2015 Humboldt Redwood Company, LLC Rare Plants Annual Report 2015 Rare Plants Annual Report Humboldt Redwood Company LLC. December 1, 2015 i Humboldt Redwood Company, LLC Rare Plants Annual Report 2015 TABLE OF CONTENTS EXECUTIVE SUMMARY ......................................................................................................................................... 1 INTRODUCTION ....................................................................................................................................................... 3 Special Status Plants ................................................................................................................................. 3 Table 1. HRC’s Special Status Plant List for the 2015 field season. ........................................... 4 Watch List Plants ...................................................................................................................................... 5 Table 2. HRC’s Watch List Plants for the 2015 field season. ..................................................... 5 Setting ....................................................................................................................................................... 6 METHODS ................................................................................................................................................................... 6 Survey Methods ........................................................................................................................................ 6 Mitigation Methods .................................................................................................................................. 7 Effectiveness Monitoring Methods........................................................................................................... 8 Research Methods..................................................................................................................................... 8 Data Management and Analysis Methods ................................................................................................ 8 Definition of Occurrence ........................................................................................................................ 10 RESULTS ................................................................................................................................................................... 11 Survey Results ........................................................................................................................................ 11 Table 3. 2015 Assessed/surveyed acres by month. .................................................................... 11 Table 4. Summary of 2015 Special Status Plant detections and property-wide totals. ............. 12 Effectiveness Monitoring Results ........................................................................................................... 12 PROPERTY-WIDE CONSULTATIONS ............................................................................................................... 13 CHANGES TO HRC’S SPECIAL STATUS PLANT AND WATCH LISTS ...................................................... 13 ASTRAGALUS AGNICIDUS (HUMBOLDT MILK-VETCH) .............................................................................. 14 Introduction and Summary ..................................................................................................................... 14 Methods .................................................................................................................................................. 15 Survey Methods.................................................................................................................................. 15 Mitigation Methods ............................................................................................................................ 15 Results .................................................................................................................................................... 15 Survey and Mitigation Results ........................................................................................................... 15 Effectiveness Monitoring Results ...................................................................................................... 15 Discussion ............................................................................................................................................... 15 CAREX ARCTA (NORTHERN CLUSTERED SEDGE) ....................................................................................... 18 Introduction and Summary ..................................................................................................................... 18 Methods .................................................................................................................................................. 18 Survey Methods.................................................................................................................................. 18 Mitigation Methods ............................................................................................................................ 19 Results .................................................................................................................................................... 19 Survey and Mitigation Results ........................................................................................................... 19 Effectiveness Monitoring Results ...................................................................................................... 19 Discussion ............................................................................................................................................... 19 ERYTHRONIUM REVOLUTUM (COAST FAWN LILY) .................................................................................... 20 Introduction and Summary ..................................................................................................................... 20 Methods .................................................................................................................................................. 21 i Humboldt Redwood Company, LLC Rare Plants Annual Report 2015 Survey Methods.................................................................................................................................. 21 Mitigation Methods ............................................................................................................................ 21 Research Methods: Erythronium revolutum Response to Herbicide Application ............................ 21 Results .................................................................................................................................................... 22 Survey and Mitigation Results ........................................................................................................... 22 Table 5. Erythronium revolutum locations, numbers, and mitigations ...................................... 22 Effectiveness Monitoring Results ...................................................................................................... 22 Research Results: Erythronium revolutum Response to Herbicide Application ................................ 22 Discussion ............................................................................................................................................... 22 GILIA CAPITATA SSP. PACIFICA (PACIFIC GILIA) ........................................................................................ 23 Introduction and Summary ..................................................................................................................... 23 Methods .................................................................................................................................................. 23 Survey methods .................................................................................................................................. 23 Mitigation methods ............................................................................................................................ 23 Results .................................................................................................................................................... 24 Survey and Mitigation Results ........................................................................................................... 24 Table 6. 2015 Gilia capitata ssp. pacifica locations, numbers, and mitigations. ...................... 24 Effectiveness Monitoring Results ...................................................................................................... 24 Discussion ............................................................................................................................................... 24 MONTIA HOWELLII (HOWELL’S MONTIA) ..................................................................................................... 25 Introduction and Summary ..................................................................................................................... 25 Methods .................................................................................................................................................. 26 Mitigation methods ...........................................................................................................................
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