Arachniodes denticulata
Arachnoides nipponica
Aralia californica
Arbutus menziesii
Arbutus unedo
Arceuthobium americanum
Arctostaphylos hookeri ssp. franciscana
Arctostaphylos hookeri ssp. hearstiorum
Arctostaphylos hookeri ssp. hookeri
Arctostaphylos manzanita ssp. elegans
Arctostaphylos mewukka ssp. mewukka
Arctostaphylos montana ssp. ravenii
Arctostaphylos nevadensis
Arctostaphylos obispoensis (bark)
Arctostaphylos pallida (bark)
Arctostaphylos patula
Arctostaphylos aff. purissima
Arctostaphylos uva-ursi
Arctostaphylos uva-ursi ssp monoensis
Arctostaphylos viscida
Arctostaphylos viscida ssp. mariposa
Arctostaphylos viscida ssp. viscida
Arenaria ciliata
Argemone munita
Arisema nepenthoides
Aristolochia californica
Aristolochia clematitis
Aristolochia rotunda
Armeria maritima
Armeria maritima ssp. californica
Arnica cordifolia
Arnica longifolia
Arnica mollis
Arnica nevadensis
Arnica ovata
Artemisia arbuscula ssp. thermopola
Artemisia douglasiana
Artemisia ludoviciana ssp. incompta
Artemisia michauxiana
Artemisia tridentata ssp. vaseyana
Artemesia sp.
Asarum hartwegii
Asarum lemmonii
Asclepias cordifolia
Asclepias eriocarpa with monarch caterpillars
Asclepias speciosa with monarch caterpillars etc
Asclepias fascicularis
Asclepias syriaca
Asclepias vestita
Asphodelus aestivus
Asphodelus albus
Asphodelus microcarpus
Asphodelus sp.
Aspidotis densa
Asplenium scolopendrium
Aster alpinus
Aster tartaricus
Astragalus bolanderi
Astragalus canadensis var. brevidens
Astragalus gambelianus
Astragalus gibbsii
Astragalus onobrychis
Astragalus purshii var lectulus
Astragalus whitneyi var. whitneyi
Astrolepis sinuata
Asynuma prenanthoides (see Smithiastrum prenanthoides)
Athyrium felix-femina
Athysanus pusillus
Atriplex truncata
Atropa belladonna
Austroderia toetoe
Azolla filliculoides
Babiana curviscapa
Babiana plicata
Babiana rubrocyanea
Baccharis salicifolia ssp. salicifolia
Bahia ambrosioides
Ballota acetabulosa
Ballota pseudodictamnus
Balsamorhiza deltoidea
Balsamorhiza saggitata
Bambusa oldhami
Bambusa sp. (leaves)
Banksia ericifolia
Banksia integrifolia
Banksia spinulosa
Baptista australis
Barbarea orthoceras
Bartsia alpina?
Bauhinia forficata
Bauhinia macranthera
Begonia cucullata
Begonia pinnatifida
Berberis aquifolium
Berberis aquifolium var. aquifolium
Berberis aquifolium var. repens
Berberis darwinii
Berberis pinnata
Berberis sargentiana
Bergenia crassifolia
Bergenia stracheyi
Berkheya purpurea
Betula pendula (bark)
Betula utilis (bark)
Bilbergia eloisae
Bistorta bistortoides
Blackstonia perfoliata
Blechnum gibbum
Blechnum spicant (see Struthiopteris spicant)
Blennosperma nanum var. nanum
Bletilla ochracea
Bletilla striata
Boechera arcuata
Boechera hoffmannii
Boechera howelli
Boechera lemmonii
Boechera lyallii
Boechera perennans
Boechera platysperma
Boechera pratincola
Boechera pulchra
Boechera rectissima
Boechera retrofracta
Bomarea caldasii
Bonatea speciosa
Borago officinalis
Bouvardia ternifolia
Bowkeria verticillata
Boykinia major
Brachyotum ledifolium
Brahea dulcis
Briza maxima
Brodiaea appendiculata
Brodiaea elegans ssp. elegans
Brodiaea sp. (labeled in botanical gardens as Brodiaea californica but probably not that species)
Bromus tectorum
Brugmansia sanguinea
Brugmansia versicolor
Brugmansia vulcanicola
Buddleja officinalis
Bulbine latifolia
Bulbinella floribunda