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Puccinellia wrightii

×Pucciphippsia vacillans

Quercus marilandica var. ashii

Ranunculus arizonicus

Arizona buttercup

Rhodiola rhodantha

Red orpine

Sedum roseum

Rhododendron molle

Rhus microphylla

Desert sumac

Rhynchosia caribaea

Rhynchosia cinerea

Rhynchospora marisculus

Ribes oxyacanthoides subsp. cognatum

Ribes deductum

Robinia pseudoacacia var. pyramidalis

Sorghum bicolor var. bicolor × bicolor var. sudanense

Spathoglottis plicata

Philippine ground orchid

Spermacoce eryngioides

Sporobolus vaginiflorus var. vaginiflorus

Stachys mexicana

Mexican hedge-nettle

Stenotaphrum micranthum