544 
RHODOTYPOS 
found in no other plant of the order, except in seedlings of Prunus, 
There is an epicalyx (see Potentilla). 
Rhoeadales. The 12th cohort of Archichlamydeae (p. 128). 
Rhoeadinae (Warming). The 9th cohort of Choripetalae (p. 137). 
Rhus (Tourn.) Linn. (incl. Cotinus Tourn. and Toxicodendron Tourn.). 
Anacardiaceae (in). 120 sp. subtrop. and warm temp. R. Coriaria 
L. is the Sumac (S. Eur.); its leaves, ground fine, are used for 
tanning and dyeing. R. Toxicodendron L. (N. Am.) is the poison- 
ivy, climbing with roots like ivy. Its juice produces ulcerations or 
erysipelas. R. Cotinus L. (Medit. to China) is the wig-tree, often 
cultivated in shrubberies. The firs, are polygamous. The fruits are 
dispersed in a curious way. The stalk of each drupe remains smooth, 
but the sterile parts of the panicle lengthen and become very hairy. 
Then when ripe the stalks become detached at their joints, and the 
whole infl., with the fruits on it, falls to the ground and may be blown 
about by the wind, it being exceedingly light in proportion to its size. 
The wood yields the yellow dye known as ‘young fustic.’ R. verni- 
cifera DC. is the lacquer-tree. Japan lacquer is obtained from notches 
in the stem. R. succedanea L. is the wax-tree of Japan; its crushed 
berries yield wax. 
Rhynchospora Willd. = Rynchospora Vahl. 
Ribes Linn. Saxifragaceae (vi). 50 sp. N. temp, and Andine ; 4 in 
Brit. Shrubs, often with spines (emergences), and with racemes of 
firs, on ‘ short shoots.’ Ovary inferior, with two parietal placentae. 
Firs, usually homogamous, with self-pollination in default of insect- 
visits. R . alpinum L. is dioecious. In R. sanguineum Pursh 
(common in shrubberies, and known as flowering currant) the petals 
change from white to pink as the firs, grow older, and in R. aureiim 
Pursh from yellow to carmine (see Fumaria, Boraginaceae). R. 
rubmm L. is the red, R. nigrum L. the black currant, R. Grossularia 
L. the gooseberry, all largely cultivated for their fruits. 
Richardia Kunth. (Zantedeschia Spreng.). Araceae (v). 6 sp. S. Afr., 
including R> africana Kunth, the common ‘ Arum lily ’ of green- 
houses. 
Richea R. Br. Epacridaceae. 8 sp. Tasmania, Victoria. 
Ricinus (Tourn.) Linn. Euphorbiaceae (A. 11. 1). 1 sp. Afr., R. 
communis L. the castor-oil plant, a shrub in tropical countries, a 
herbaceous plant in our gardens. Monoecious. The S fir. has much- 
branched sta. The fruit explodes into the separate cpls., which at 
the same time open and drop the seeds. The seed is rich in oil, 
which is used medicinally and as a lubricant. 
Rindera Pall. Boraginaceae (iv. 1). 10 sp. Medit., Eur., As. 
Rinorea Aubl. = Alsodeia Thou. 
Rivina Plum, ex Linn. Phytolaccaceae. 5 sp. trop. Am. P 4, A 4 
or 8, G 1. Berry. 
Robinia Linn. Leguminosae (ill. 6). 6 sp. N. Am. R. Pseud-acacia L. 
