rare plants

Rare Plants

MRC and HRC survey all proposed timber harvesting areas for the occurrence of rare plants and their habitats. This includes a field analysis as well as a review of the California Department of Fish and Game’s California Natural Diversity Database.

 

Table 1 – Rare and uncommon plant occurrences on MRC forestlands, 2017.

Latin name Common name CRPR No. of occurrences Estimated no. of plants Status
Astragalus agnicidus Humboldt milk-vetch 1B.1 30 15,619 Special Status
Calamagrostis bolanderi Bolander’s reed grass 4.2 11 43,100 Watch List
Campanula californica swamp harebell 1B.2 21 49,803 Special Status
Carex californica* California sedge 2B.3 4 5 Special Status
Ceanothus gloriosus var. exaltatus Point Reyes ceanothus 4.3 7 569 Watch List
Coptis laciniata Oregon goldenthread 2B.2 24 11,715 Special Status
Cordylanthus tenuis spp. brunneus serpentine bird’s beak 4.3 1 100 Watch List
Erythronium revolutum coast fawn lily 2B.2 2 90 Special Status
 Hemizonia congesta spp. calyculata Mendocino tarplant 4.3 1 3,000 Watch List
Hesperocyparis pygmaea* pygmy cypress 1B.2 9 46 Special Status
Horkelia tenuiloba thin-lobed horkelia 1B.2 2 120 Special Status
Kopsiopsis hookeri small groundcone 2B.3 2 11 Special Status
Leptosiphan acicularis bristly leptosiphan 4.2 1 200 Special Status
Lilium maritimum coast lily 1B.1 7 200 Special Status
Lilium rubescens redwood lily 4.2 32 1,134 Watch List
Listeria cordata heart-leaved twayblade 4.2 3 100 Watch List
Lycopodium clavatum running-pine 4.1 2 8 Watch List
Mitellastra caulescens leafy-stemmed mitrewort 4.2 23 12,450 Watch List
Pinus contorta ssp. Bolanderi Bolander’s beach pine 1B.2 4 27 Special Status
Piperia candida White-flowered rein orchid 1B.2 33 986 Special Status
 Pityopus californicus California pinefoot 4.2 3 18 Watch List
Pleuropogon hooverianus North coast semaphore grass 1B.1 9 29,873 Special Status
Pleuropogon refractus nodding semaphore grass 4.2 1 75 Watch List
Sidalcea malachroides maple-leaved checkerbloom 4.2 10 355 Watch List
Streptanthus glandulosus ssp. hoffmanii secund jewel-flower 1B.3 1 25 Special Status
 Thermopsis robusta robust false pine 1B.2 2 42 Special Status
Usnea longissima long-beard lichen 4.2 92 NA Watch List
Total     337 169,671  

 

Table 2 – Rare plant occurrences on HRC forestlands, 2017.

Latin name Common name No. of populations 1 No. of quads Estimated no. of plants
Astragalus agnicidus Humboldt milk-vetch 1 2 8,083
Carex arcta Northern clustered sedge 3 2 55
Erythronium revolutum / oregonum2 Coast fawn lily / giant fawn lily 28 8 6,685
Gilia capitata ssp. pacifica Pacific gilia 22 8 14,544
Montia howellii Howell’s montia 43 12 37,534
Packera bolanderi var. bolanderi Seacoast ragwort 37 7 8,810
Piperia candida White-flowered rein orchid 22 6 2,041
Sidalcea malvaeflora ssp. patula Siskiyou checkerbloom 9 6 2,763
Total   165 NA 80,515

1Populations are defined as groups of the same species separated by at least a quarter-mile from other such known groups, equivalent to the CNDDB definition of “occurrence.”
2HRC botanists have discovered several populations which may contain E. oregonum or may be white forms of E. revolutum. At this time we are not confident in the identification and are reporting these as one taxon.

 

Table 3 – Uncommon plant occurrences on HRC forestlands, 2017.

Latin name Common name No. of populations 1 No. of quads Estimated no. of plants
Astragalus rattani var. rattani Rattan's milk-vetch 1 1 1
Chrysosplenium glechomifolium Pacific golden sacifrage 5 5 1,338
Coptis laciniata Oregon goldenthread 3 1 1,150
Lilium kelloggii Kellogg's lily 89 6 3,150
 Lilium rubescens Redwood lily 37 8 597
Lycopodium clavatum Running-pine 119 11 477
Mitellasra caulescens Leafy-stemmed mitrewort 50 9 61,572
Pityopus californicus California pinefoot 24 7 91
Pleuropogon refractus Nodding semaphore grass 23 9 1,996
Ribes roezlii var. amictum Hoary gooseberry 4 3 273
Sidalcea malachroides Maple-leaved checkerbloom 92 12 9,871  
Usnea longissima Long-beard lichen 184 14 5,201
Total   631  NA 86,348

1 Populations are defined as groups of the same species separated by at least a quarter-mile from other such known groups, equivalent to the CNDDB definition of “occurrence”.

For information on HRC’s rare plant monitoring results, please see the Humboldt Redwood Company Habitat Conservation Plan (HCP) page in the Plans & Reports section of the website.