GLENDORA’S RARE AND ENDANGERED PLANTS
2001, Dick Swinney

Revised from GLENDORA FOOTHILLS PLANT CHECKLIST SAN GABRIEL MOUNTAINS, 1994. Dick Swinney

The following plants are listed in the “California Native Plant Society’s Inventory of Rare and Endangered Vascular Plants of California”, September 1988, Special Publication No. 1, Fourth Edition., and/or A FIELD GUIDE TO THE RARE PLANTS OF THE ANGELES NATIONAL FOREST, Gerard J. Allan, Orlando Mistretta, Megan Tommerup and Kitty Blassey, Rancho Santa Ana Botanic Garden and William J. Brown, Jr., Angeles National Forest, 1995.

1. Boykinia rotundifolia Parry - Saxifragaceae - Round-leaved boykinia
CNPS list: 4, R-E-D Code: 1-1-3, State/Fed. Status: None
Several populations
2. Brodiaea filifolia Wats. - Liliaceae - Thread-leaved brodiaea
CNPS list: 1B, R-E-D Code: 3-3-3, State/Fed. Status: CE/C2
Five populations
3. Brickellia nevinii Gray - Asteraceae - Nevin’s brickellbush
CNPS list: 4, R-E-D Code: 1-1-3, State/Fed. Status: None
One population
4. Calochortus catalinae Wats. - Liliaceae - Catalina mariposa lily
CNPS list: 4, R-E-D Code: 1-2-3, State/Fed. Status: None
Three populations - South Hills( 1 plant), Morgan Canyon Plateau, BDC on ridge near Wren Meacham Trail
5. Calochortus plummerae E. Greene - Liliaceae - Plummer’s mariposa lily, scattered throughout
CNPS list: 1B, R-E-D Code: 2-2-3, State/Fed. Status: /C2
Several populations
6. Dudleya multicaulis (Rose) Moran. - Crassulaceae - Many- stemmed Dudleya
CNPS list: 1B, R-E-D Code: 1-2-3, State/Fed. Status: None
One population, South Hills
7. Lilium humboldtii Roezl. & Leichtl. ssp. ocellatum (Kellogg) Thorne
Liliaceae - Ocellated humboldt lily
CNPS list: 4, R-E-D Code: 1-2-3, State/Fed: /C2
Several populations
8. Quercus engelmannii Greene - Fagaceae - Engelmann oak
CNPS list: 4, R-E-D Code: 1-2-2, State/Fed. Status: None
Mostly in NW area, scattered throughout
9. Thelypteris puberula (Baker) C. Morton var. sonorensis A. Reed Smith - Thelypteridaceae - Sonoran maiden fern
CNPS list: 2: R-E-D Code: 2-2-1, State/Fed: None
One population, Harrow Canyon
The R-E-D Code: CNPS developed a scheme that involved combining three coordinate, related elements that could be scored independently. These components are: Rarity, which addresses the extent of the plant, both in terms of numbers of individuals and the nature and extent of distribution; endangerment, which embodies the perception of the plants being threatened with extinction for whatever reason; and distribution, which focuses on the general range of the plant.
Together these three elements form the R-E-D Code. Each element in the code is divided into three classes or degrees of concern, represented by the number 1,2, or 3. In each case, the higher the number, the more critical is the concern. The system is summarized as follows.
R(Rarity):
1. Rare, but found in sufficient numbers and distributed widely enough that the potential for extinction or extirpation is low at this time.
2. Occurrence confined to several populations or to one extended population.
3. Occurrence limited to one or a few highly restricted populations or present in such small numbers that it is seldom reported.
E (Endangerment):
1. Not endangered.
2. Endangered in a portion of its range.
3. Endangered throughout its range.
D (Distribution):
1. More or less widespread outside California.
2. Rare outside California.
3. Endemic to California.

List 1A: Plants presumed extinct in California.
List 1B: Plants rare, threatened or endangered in California and elsewhere.
List 2: Plants rare, threatened or endangered in California, but more common elsewhere.
List 3: Plants about which we need more information, a review list.
List 4: Plants of limited distribution, a watch list.