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Ranunculus sulphureus

Ranunculus sulphureus

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Thora buttercup

Ranunculus thora

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Threelobe buttercup

Ranunculus trilobus

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Three-lobed crowfoot

Ranunculus tripartitus

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Raukaua anomalus

Raukaua anomalus

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Raukaua edgerleyi

Raukaua edgerleyi

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Raukaua simplex

Raukaua simplex

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Four-leaf devil-pepper

Rauvolfia tetraphylla

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African serpentwood

Rauvolfia vomitoria

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Camphor Daisy (Camphorweed)

Rayjacksonia phyllocephala

Direct sow in spring in well-drained, dry, sandy soil in full sun — camphor daisy is a native coastal plain annual of the Gulf Coast, naturalized on barrier island beaches, coastal prairies, and sunny, sandy disturbed areas from Texas to Florida, producing masses of small, bright yellow daisy flower

Reboulia hemisphaerica

Reboulia hemisphaerica

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White upright mignonette

Reseda alba

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Yellow mignonette

Reseda lutea

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Dyer's rocket

Reseda luteola

A common weed in North America Reseda luteola grows best in well-drained, neutral to slightly alkaline soils, in a sunny or semi-shaded position. A high-quality yellow dye is made from the seed. Mixed with the blue from woad (Isatis tinctoria) it produces greens such as Lincoln green. It has fallen into disuse with modern chemical dyes. Reseda luteola also has mild narcotic medicinal uses. Common names include dyer's rocket, dyer's weed, weld, woold, and yellow weed.

Mignonette

Reseda odorata

Direct sow mignonette on the soil surface, as it needs light to germinate and resents root disturbance. The unremarkable greenish flower spikes release an intensely sweet raspberry-like fragrance beloved in Victorian gardens. Grow in full sun to light shade in cool weather and fertile, alkaline soil

Rampion mignonette

Reseda phyteuma

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Japanese knotweed

Reynoutria japonica

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Giant knotweed

Reynoutria sachalinensis

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Bohemian knotweed

Reynoutria × bohemica

Rhabdoweisia crispata

Rhabdoweisia crispata

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Rhabdoweisia fugax

Rhabdoweisia fugax

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Rhacocarpus purpurascens

Rhacocarpus purpurascens

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Mediterranean buckthorn

Rhamnus alaternus

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Alpine buckthorn

Rhamnus alpina

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