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Threelobe buttercup

Ranunculus trilobus

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Three-lobed crowfoot

Ranunculus tripartitus

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Sea radish

Raphanus raphanistrum

Champion Radish

Raphanus sativus

Sow seeds a half inch deep directly in the garden and thin to about an inch apart for well-formed roots. These fast radishes are ready in under a month, producing round, cherry-red roots with crisp, mild white flesh. Keep the soil evenly moist to avoid pithiness and pungency, and sow in succession d

Tillage Radish (Daikon Cover)

Raphanus sativus var. longipinnatus

Broadcast seed about 1/2 in deep in late summer; the thick taproot drills deep and shatters compaction. In cold-winter areas it dies and rots in place, leaving channels and released nutrients. Where it survives, mow before it flowers to prevent seeding.

Forage Radish (Tillage Radish Type)

Raphanus sativus var. niger

Broadcast seed at 8–10 lb/acre or drill at 6–7 lb/acre and cover to 1/4 in depth; forage radish emerges quickly and develops a taproot up to 18 in deep that fractures compacted subsoil and scavenges nitrates before they leach. In USDA zones 5 and colder the taproot reliably winter-kills, leaving a h

Ball-turnip

Rapistrum rugosum

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Longhead-coneflower

Ratibida columnifera

Prairie coneflower (Mexican hat) is one of the most distinctive and drought-tolerant of all native prairie wildflowers — the flowers have a tall, thimble-shaped, elongated central cone surrounded by reflexed, drooping golden to red-brown ray petals that create the unmistakable 'Mexican sombrero' sil

Drooping prairie-coneflower

Ratibida pinnata

Sow in well-drained, average to poor, neutral to slightly alkaline soil in full sun; the gray-headed coneflower is a tall, drought-tolerant prairie native with drooping yellow petals reflexed away from a distinctive elongated gray-brown cone, giving it an unmistakable silhouette in the summer meadow

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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Common brighteyes

Reichardia picroides

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False sow-thistle

Reichardia tingitana

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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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Bridal broom

Retama monosperma

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