Monitoring
Rare Plants
MRC and HRC survey all areas proposed for timber harvesting for habitat and occurrence of rare plants. This includes a field analysis as well a review of the California Department of Fish and Game's California Natural Diversity Database.
Table 1 - Rare plant occurrences on MRC forestlands, 1998-2008
| Latin name |
Common name |
No. of occurrences |
No. of quads |
Estimated no. of plants |
| Astragalus agnicidus |
Humboldt milk-vetch |
12 |
7 |
18,617 |
| Boschniakia hookeri |
small ground cone |
1 |
1 |
5 |
| Callitropsis pygmaea |
pygmy cypress |
Numerous |
* |
Numerous |
| Campanula californica |
swamp harebell |
7 |
4 |
48,000 |
| Coptis laciniata |
Oregon goldenthreads |
7 |
6 |
295 |
| Lilium maritimum |
coast lily |
3 |
3 |
18 |
| Pinus contorta ssp. Bolanderi |
Bolander's beach pine |
Numerous |
* |
Numerous |
| Piperia candida |
White-flowered piperia |
1 |
1 |
3 |
| Pleuropogon hooverianus |
North coast semaphore grass |
6 |
1 |
20,762 |
| Sidalcea malachroides |
maple-leaved checkerbloom |
5 |
5 |
104 |
| Usnea longissima |
long-beard lichen |
21 |
11 |
> 270 |
| |
|
|
|
|
| Total |
|
63 |
39 |
88,074 |
* Specific distributions not yet summarized
Table 2 - Rare plant occurrences on HRC forestlands, 1999-2008
| Latin name |
Common name |
No. of populations 1 |
No. of quads |
Estimated no. of plants |
| Astragalus agnicidus |
Humboldt milk-vetch |
2 |
2 |
13,255 |
| Carex arcta |
Northern clustered sedge |
32 |
2 |
45 |
| Erythronium revolutum / oregonum3 |
Coast fawn lily / giant fawn lily |
22 |
7 |
6,231 |
| Gilia capitata ssp. pacifica |
Pacific gilia |
13 |
6 |
10,346 |
| Lycopodium clavatum |
Running-pine |
71 |
11 |
385 |
| Montia howellii |
Howell’s montia |
39 |
11 |
300,000 |
| Packera bolanderi var. bolanderi |
Seacoast ragwort |
31 |
7 |
7,337 |
| Piperia candida |
White-flowered rein orchid |
4 |
2 |
160 |
| Sidalcea malvaeflora ssp. patula |
Siskiyou checkerbloom |
10 |
6 |
1,334 |
| |
|
|
|
|
| Total |
|
195 |
17 |
342,370 |
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”.
2 The identity of the plants at one location is in question at this time.
3 HRC 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, 1999-2008
| Latin name |
Common name |
No. of populations 1 |
No. of quads |
Estimated no. of plants |
| Listera cordata |
Heart-leaved twayblade |
64 |
8 |
44,345 |
| Lilium kelloggii |
Kelloggs lily |
16 |
3 |
720 |
| Lilium rubescens |
Redwood lily |
15 |
5 |
94 |
| Mitella caulescens |
Leafy-stemmed mitrewort |
35 |
9 |
49,797 |
| Pityopus californicus |
California pinefoot |
2 |
2 |
7 |
| Pleuropogon refractus |
Nodding semaphore grass |
3 |
2 |
172 |
| Ribes roezlii var. amictum |
Hoary gooseberry |
4 |
3 |
273 |
| Sidalcea malachroides |
Maple-leaved checkerbloom |
72 |
11 |
10,700 |
| Usnea longissima |
Long-beard lichen |
170 |
14 |
5,038 |
| |
|
|
|
|
| Total |
|
381 |
|
111,146 |
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.