Part 220

Rib-grass, 530.

Riccia, 186, 189, 190.

Ricciaceæ, 190.

Rice, 291, 293, 296.

Richardia, 305.

Richardsonia, 550.

Ricinus, 431.

Riella, 192, 231.

Ringworm, 180.

Rivina, 372.

Rivularia, 10, 25.

Rivulariaceæ, 22, 24, 25.

Robinia, 470, 473.

Roccella, 142.

Rock-cress, 402.

Rock-rose, 412.

Rod-bacteria, 39.

Roestelia, 147, 148, 151, 152, 153.

Roman spinach, 372.

Roots, 4.

“Ropiness,” 35.

Rosa, 148, 459, 460.

Rosaceæ, 451, 457.

Rose, 121.

Rose-mallow, 428.

Rose of Jericho, 401, 574.

Roseæ, 459.

Rosellinia, 130.