The Genus Parthenium: Guayule, Mariola
Rose Pavonia (Pavonia lasiopetala)
Gilia Beardtongue (Penstemon ambiguus)
Rock Penstemon (Penstemon baccharifolius)
Scarlet Buglar (Penstemon barbatus)
Dusty Penstemon (Penstemon comarrhenus)
Catalina Beardtongue (Penstemon discolor)
Cochise Beardtongue (Penstemon dasyphyllus)
Firecracker Penstemon (Penstemon eatonii)
Fendler's Penstemon (Penstemon fendleri)
Palmer's Penstemon (Penstemon palmeri)
Parry's Penstemon (Penstemon parryi)
Pineneedle Beardtongue (Penstemon pinifolius)
Desert Penstemon (Penstemon pseudospectabilis)
Sonoran Beardtongue (Penstemon stenophyllus)
Rocky Mountain Beardtongue (Penstemon strictus)
Superb Beardtongue (Penstemon superbus)
Hill Country Penstemon (Penstemon triflorus)
Frogfruit (Phyla nodiflora)
Mountain Phlox (Phlox austromontana)
Santa Catalina Mountain Phlox (Phlox tenuifolia)
Hairyseed Bahia (Picradeniopsis absinthifolia)
Rothrock's Knapweed (Plectocephalus rothrockii)
Frosted Mint (Poliomintha incana)
Lavender Spice (Poliomintha maderensis)
Odora (Porophyllum gracile)
Yerba Porosa (Porophyllum ruderale)
Desert Unicorn-Plant (Proboscidea althaeifolia)
Whitestem Paperflower (Psilostrophe cooperi)
