Parry Spikeweed
Centromadia parryi
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Southern Tarplant
Centromadia parryi ssp. australis
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Congdon's Tarplant
Centromadia parryi ssp. congdonii
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Pappose Tarplant
Centromadia parryi ssp. parryi
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Parry's Rough Tarplant
Centromadia parryi ssp. rudis
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Common Spikeweed
Centromadia pungens
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Smooth Tarplant
Centromadia pungens ssp. laevis
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Common Spikeweed
Centromadia pungens ssp. pungens
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Red Triangles
Centrostegia thurberi
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Phantom Orchid
Cephalanthera austiniae
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California Buttonbush
Cephalanthus occidentalis
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Field Mouse-ear
Cerastium arvense
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Field Mouse-ear Chickweed
Cerastium arvense ssp. strictum
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Mouse Ear Chickweed
Cerastium beeringianum
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Western Field Mouse-ear Chickweed
Cerastium viride
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Hornwort
Ceratophyllum demersum
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Desert Museum Palo Verde
Cercidium 'Desert Museum'
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Western Redbud
Cercis occidentalis
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Mountain Mahogany
Cercocarpus betuloides
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Mountain Mahogany
Cercocarpus betuloides var. betuloides
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Island Mountain-mahogany
Cercocarpus betuloides var. blancheae
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Few Flowered Mountain Mahogany
Cercocarpus betuloides var. macrourus
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Curl Leaf Mountain Mahogany
Cercocarpus ledifolius
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Curl Leaf Mountain Mahogany
Cercocarpus ledifolius var. intermontanus
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Curl Leaf Mountain Mahogany
Cercocarpus ledifolius var. intricatus
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Cercocarpus ledifolius var. ledifolius
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San Diego Mountain Mahogany
Cercocarpus minutiflorus
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Catalina Island Mountain Mahogany
Cercocarpus traskiae
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Sharsmith Pincushion
Chaenactis alpigena
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Artemisia Leaved Chaenactis
Chaenactis artemisiifolia
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Pebble Pincushion
Chaenactis carphoclinia
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Pebble Pincushion
Chaenactis carphoclinia var. carphoclinia
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Peirson's Pincushion
Chaenactis carphoclinia var. peirsonii
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Hoary Chaenactis
Chaenactis douglasii
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Alpine Dusty-maidens
Chaenactis douglasii var. alpina
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Dusty-maidens
Chaenactis douglasii var. douglasii
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Fremont Pincushion
Chaenactis fremontii
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Common Yellow Chaenactis
Chaenactis glabriuscula
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Yellow Pincushion
Chaenactis glabriuscula var. glabriuscula
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Inner Coast Range Pincushion
Chaenactis glabriuscula var. heterocarpha
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Sand Buttons
Chaenactis glabriuscula var. lanosa
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Big Headed Yellow Chaenactis
Chaenactis glabriuscula var. megacephala
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Orcutt's Pincushion
Chaenactis glabriuscula var. orcuttiana
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Mojave Pincushion
Chaenactis macrantha
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Sierra Pincushion
Chaenactis nevadensis
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Parish's Chaenactis
Chaenactis parishii
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Santolina Pincushion
Chaenactis santolinoides
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Desert Pincushion
Chaenactis stevioides
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Shasta Chaenactis
Chaenactis suffrutescens
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Xantus Pincushion
Chaenactis xantiana
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Wheeler's Dune-broom
Chaetadelpha wheeleri
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Rose Heath
Chaetopappa ericoides
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Southern Mountain Misery
Chamaebatia australis
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Mountain Misery
Chamaebatia foliolosa
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Fern Bush
Chamaebatiaria millefolium
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Port Orford Cedar
Chamaecyparis lawsoniana
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Thickstem Aster
Chamaesaracha arida
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Fireweed
Chamerion angustifolium
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Fireweed
Chamerion angustifolium ssp. canescens
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River Beauty
Chamerion latifolium