Specimen
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Rhamnus rubra ssp. yosemitana
Rare shrub to 0.6 m tall, flowers green, on dry gravelly s-facing slope with Prunus emarginata, Ceanothus cordulatus, C. velutinus.
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Ranunculus aquatilis var. capillaceus
Common submerged quatic per. Herb, stems to 2 dm long, corolla white, in shallow water of man-made trout ponds with Hippuris vulgaris and Alopecurus aequalis.
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Quercus vaccinifolia
Occasional shrub to 1.5 m tall, in sunny open area on northeast-facing slope with Ceanothus velutinus, Pinus jeffreyi and Abies magnifica.
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Pyrola asarifolia ssp. asarifolia
Rare perrienial herb, corollas pink with maroon edges, in deep shade of Alnus tenuifolia, Populus tremuloides, in moist soil near Mammoth Creek, on short cut from meadow trail to diversion.
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Purshia tridentata var. tridentata
Very common shrub to 0.5 m tall, corollas pale yellow. On sunny west-facing sagebrush-covered moraine with Artemisia tridentata, Symphoricarpos vaccinoides.
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Purshia tridentata var. glandulosa
Shrub to 1 m tall, petals pale yellow, locally uncommon in dry sand-silt-gravel, SW corner of property; in sagebrush scrub with Purshia tridentata, Artemisia tridentata.
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Pteridium aquilinum var. pubescens
Occasional fern to 0.5 m tall, on sunny slopes above Mammoth Creek near waterfall, with Prunus emarginata and Amelanchier pallida.
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Potentilla gracilis var. elmeri – Five-finger Cinquefoil
Perennial herb, petals bright yellow; common, wet meadow, east end of property, near Convict Creek; with Carex spp., Senecio hydrophilus.
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Potentilla glandulosa ssp. hansenii
Common perennial herb, corollas pale yellow, in open suny places in forest with Pinus murrayana, Pinus jeffreyi, and Agastache urticifolia.
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Potentilla biennis – Greene’s Cinquefoil
Occasional perennial herb, corolla yellow, in moist soil near spring below Hans George’s cabin with Veratrum californicum, Salix, Castilleja miniata, Mimulus nasustus.
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Potamogeton pusillus – Small Pondweed
Submerged aquatic annual herb, occasional in man-made trout pond with Alopecurus aequalis and Ranunculus aquatilis. Stems to 3 dm long.
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Polygonum douglasii var. douglasii – Douglas’ Knotweed
Common annual herb, achenes shiny brown, corollas pink, in moist meadow soil with Heraceum sphondylium, Veratrum californicum.
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Polygonum douglasii ssp. johnstonii – Johnston’s Knotweed
Annual herb, flowers green; occasional in open sites within dry meadow, east end of property near north fence; with Smilacina stellate, Astragalus Canadensis var. brevidens.
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Polygonum arenastrum – Common Knotweed
Annual herb, corollas white and pink, stems to 1 dm long, occurring as weed in lawn in front of caretaker’s cabin
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Poa wheeleri – Wheeler Bluegrass
Common perennial grass, in dry soil in shade of forest on steep, north east facing slope with Abies magnifica.
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Poa pratensis ssp. pratensis – Kentucky Bluegrass
Perennial grass, rhizomatous, common in gravelly disturbed ground, west of the laboratory; with Cryptantha simulans, escurainia incisa.
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Poa leptocoma ssp. letocoma – Bog Bluegrass
Occasional perennial grass, on moist slope near snow melt rivulets with Pinus jeffreyi, Pinus murrayana.
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Platanthera leucostachys – Sierra Rein Orchid
Common perennial herb, corollas white, in moist open places, expecially meadow margins, in boggy soil with Heracleum sphondylium. Mimulus nasutus, Castilleja miniata.
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Plantago major – Broad-leaved Plantain
Rare weed in driveway near cookhouse with Potentilla biennis and Epilobium angustifolium, in shaded soil that is watered frequently.
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Plagiobothrys cusickii – Cusick’s Popcorn Flower
Occasional, annual herb, corollas pale lavender, in moist areas on lower part of moraine with Purshia tridentata, Elymus cinereus.
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Piperia unalascensis – Alaska Orchid
Rare perennial herb, corollas green, in moist sunny spot behind University Cabin with Smilacina racemosa and Castilleja miniata.
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Pinus monticola – Western White Pine
Rare tree to 35 m tall, on shaded northeast-facing slope with Abies magnifica and Pinus murrayana.
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Pinus jeffreyi – Jeffrey Pine
Common tree to 40 m tall or more, at base of northeast-facing slope with Abies magnifica, understory containing Quercus vaccinifolia and Ceanothus cordulatus.
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Pinus contorta ssp. murrayana – Lodgepole Pine
Very common tree to 80 feet tall, around meadow and cbins with Abies concolor, Pinus jeffreyi, Ribes cereum.