Bursera hindsiana Bursera microphylla
Bursera simaruba Butomus umbellatus
Byrsonima lucida Cabomba caroliniana
Caesalpinia cacalaco Caesalpinia coriaria
Caesalpinia mexicana Cakile maritima
Calathea loeseneri Calliandra americana
Calliandra californica Calliandra eriophylla
Callicarpa americana Callirhoe involucrata
Calocedrus decurrens Calocedrus decurrens 'Aureo-variegata'
Calochortus clavatus Calophyllum brasiliense
Caltha palustris Calycanthus floridus
Calycanthus floridus 'Athens' Calycanthus floridus 'Michael Lindsay'
Calycanthus occidentalis Calylophus hartwegii
Calyptranthes pallens Camassia cusickii
Camassia quamash 'Alba' Camissonia cheiranthifolia
Campsis radicans Campsis radicans 'Crimson Trumpet'
Campsis radicans 'Flava' Canavalia maritima
Canella winterana Canna flaccida
Canna indica Capparis cynophallophora
Capparis flexuosa Cardamine laciniata
Carex grayi Carex laxiculmis 'Hobb (Bunny Blue™)'
Carnegiea gigantea Carpenteria californica
Carpinus caroliniana Carpinus caroliniana var. virginiana
Carpobrotus chilensis Carya aquatica
Carya carolinae septentrionalis Carya cordiformis
Carya glabra Carya illinoinensis
Carya laciniosa Carya ovata
Carya ovata 'Grainger' Carya ovata var. pubescens
Carya tomentosa Casasia clusiifolia
Cassia bahamensis Cassiope mertensiana ssp. californica
Castanea dentata Castilleja californica
Catalpa bignonioides Catalpa bignonioides 'Aurea'
Catalpa bignonioides 'Nana' Catalpa speciosa
Catalpa speciosa 'Pulveralenta' Catalpa spp.
Ceanothus x 'Blue Buttons' Ceanothus x 'Dark Star'
Ceanothus x 'Gentian Plume' Ceanothus x 'Joyce Coulter'
Ceanothus x 'Julia Phelps' Ceanothus x 'Knowles Ryerson'
Ceanothus x 'Nipumu' Ceanothus x 'Ray Hartman'
Ceanothus x 'Santa Ana' Ceanothus x 'Sierra Snow'
Ceanothus x 'Spring Valley' Ceanothus 'Concha'
Ceanothus americanus Ceanothus arboreus
Ceanothus arboreus 'Cliff Schmidt' Ceanothus arboreus 'Trewithen Blue'
Ceanothus cuneatus 'Rodeo Lagoon' Ceanothus cuneatus var. rigidus
Ceanothus gloriosus Ceanothus gloriosus exaltatus
Ceanothus gloriosus exaltatus 'Emily Brown' Ceanothus gloriosus var. porrectus
Ceanothus griseus var. horizontalis Ceanothus griseus var. horizontalis 'Carmel Creeper'
Ceanothus griseus var. horizontalis 'Diamond Heights' Ceanothus griseus var. horizontalis 'Hurricane Point'
Ceanothus griseus var. horizontalis 'Louis Edmunds' Ceanothus griseus var. horizontalis 'Yankee Point'
Ceanothus impressus Ceanothus impressus 'Vandenberg'
Ceanothus maritimus 'Claremont' Ceanothus maritimus 'Dusty Dawn'
Ceanothus oliganthus Ceanothus oliganthus var. sorediathus
Ceanothus rigidus 'Snowball' Ceanothus spinosus
Ceanothus spp. Ceanothus thyrsiflorus
Ceanothus thyrsiflorus 'Skylark' Ceanothus thyrsiflorus 'Snow Flurry'
Ceanothus x veitchianus Ceanothus verrucosus
Ceanothus vestitus