SENSITIVE AREAS OF THE EASTERN SAN GABRIEL MOUNTAINS
Morgan Canyon Debris Basin
Glendora

Dick Swinney
copyright August 2005

Observations: Many
19 April 2005
8 August 2005
Surface water flowing into the basin from the stream above. Some standing water behind the dam and draining into the release structure. The immediate thirty feet of moist soil near the standing water with only slight coverage of seedlings as the water level recedes from winter runoff.

Elevation: 1100 feet
Description: Owned and operated by the Los Angeles County Flood Control Department.
Habitat: During a year of average rainfall, some slight surface water flows from a spring on the north-west side of the debris basin. Only during years of above average rainfall will it flow to the lowest point of the basin. Water flows into the basin during;g summer months from Morgan Canyon only in years of above average rainfall.
Special Conditions: Subject to occasional debris removal.

Dicotyledons Pre 2005 Apr 2005 Aug 2005
Ageratina adenophora C FC
Amaranthus alba R C
Ammania coccinea R
Anagalus arvensis U U
Anthriscus caucalis U
Artemisia californica FC
Artemisia dougjlasiana FC FC
Baccharis salicifolia C A
Brassica rapa FC U
Centaurea melitensis C C
Cerastium viscosum U
Chamypsyche R
Chenopodium album FC A
Chenopodium ambrosioides C
Conyza canadensis FC FC
Cryptantha murricata FC FC dried
Eclypta prostrata R
Epilobium cilliatum FC
Erodium cicutarium R
Ficus carica U several at U spring area
Gallium arvense FC FC dried
Geranium dissectium FC
Gnaphallium californicum R
Gnaphallium chilense? U
Helianthus annua FC C
Heterotheca grandiflora FC FC
Hirschfeldia incana C C
Hoitia macrostachya C one large plant C
at spring area,
hundreds of seed-
lings and several
plants 4 ft high
and higher in debris
basin
Hypochoeris glabra U
Juglans californica U W. spring area U
Lactuca serriola U
Lathyrus vestitus var. vestitus U
Lotus purshianus FC FC
Lotus scoparius FC
Lupinus hirsutissimus U
Luplnus latifolius C C
Lythrum californicum FC
Medicago lupulina FC
Mellilotus albus FC
Mellilotus indicus C
Mimulus cardinalis U FC
Mimulus floribundus FC
Mimulus guttatus U A
Nicotiana glauca C
Phacelia ciccutaria FC
Phacelia campanularia U
Picris echioides U
Platanus recemosa U U
Polygonum punctatum ? FC
Polygonum aviculare U FC
Psoralea macrostachya C C
Rhorripa nasturtium-aquaticum FC A
Ricinus communis FC FC
Rumex conglomeratus C C
Salix goodingii FC
Salix lasiolepis C A
Silene gallica U
Silybum marianum C
Slanum douglasii FC
Sonchus oleraceus FC FC
Stachys albens U
spring only
Stellaria nitens FC
Stephanomera virgata? U
Tamarix ramosissima ? U
seedlings
Toxicodendron diversiloba U U
Trifolium hirtum A A
Veronica anagalis-aquatica C A

Monocotyledons
Bromus diandrus A
Bromus madritensis C
Cyperus alternifolia FC A
Cyperus R
Echinochloa crus-galli A A
Eleocharis montevidensis U
Eleocharis parishii at spring only
Erharta calycina C C
Heliochloa schoenoides U
Juncus buffonius U R
Juncus dubius ? U C Juncus rugulosis FC FC
Piptatherum melliacium FC
Polypogon monspeliensis U C
Polypogon semiverticilatus FC
Typha angustifolia FC
Typha latifolia C C at spring & throughout
Washingtonia robusta R one plant in the R
debris basin, 2 at
W. spring area

Note: One Baccharis sarathroides growing on west slope of debris basin. This is the first plant observed growing outside the South Hills of Glendora.


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