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Rhlzophora L. Rhizophoraceae. 3, R. Mangle L. in Am., K. inuc- 

 ronata Lam. and another, Japan to E. Afr. These mangroves (?'.) 

 are moderate-sized trees with a great development of roots from 

 the stem and branches. On the sub-aerial parts of the roots are 

 large lenticels, probably serving in the same way as the aerenchyma 

 of Bruguiera, &c. The seed germinates upon the tree, the hypocotyl 

 projects at the micropyle and grows rapidly. The bark is used for 

 tanning, yielding a substance known as cutch (cf. Acacia). 



Rnizophoraceae (EP., BH.}. Dicots. (Archichl. Myrtiflorae ; Myrtales 

 BH.}. 12 gen., 60 sp., trop., mostly Old World. See Mangroves. 

 Trees usu. with opp. slip. 1. ; fls. sol. or in cymes, &c. , 5 , hypo- to 

 epi-gynous, reg. K usu. 4 8 ; C 4 8 ; A 8 oo , inserted on outer 

 edge of perig. or epig. disc; G (2 5), i 5-loc. with usu. 2 anatr. 

 pend. ov. in each loc. Fr. a slightly soft berry. Chief genera: 

 Rhizophora, Bruguiera, Weiht-a. 



Rhodamnia Jack. Myrtaceae (i). 12 Malay Penins. to N.S. Wales. 



Rhodanthe Lindl. = Helipterum DC. p.p. (Comp.). 



Rhodax Spach = Heliantherrium Tourn. (Cist.). 



Rhodea Endl. = Rohdea Roth. (Lili.). 



Rhodes grass, Chloris. 



Rhodiola L. = Sedum Tourn. p.p. (Crass.). 



Rhodo- (Gr. pref.), rose red. 



Rhodocalyx Muell.-Arg. Apocynaceae (n. i). i campos of Minas 

 Geraes. K coloured. 



Rhodochiton Zucc. Scrophulariaceae (n. 3). i Mexico, R. vohibile 

 Zucc. , a twiner with sensitive petioles (cf. Clematis). Cult. orn. 



Rhodochlaena Thou. Chlaenaceae. 3 Madag. 



Rhodoclada Baker = Asteiopeia Thou. (Theaceae). E Madag. 



Rhodocodon Baker. Liliaceae (v). i Madag. 



Rhodocolea Baill. Bignoniaceae (4). i Madag. 



Rhododendron L. (incl. Azalea L.). Ericaceae (i. 2). 250 N. temp., 

 &c. ''One sp. (R. Lochae F. Muell.) is found in trop. Austr. , the 

 greatest richness of sp. is in E. As., from S. China to the Himal. and 

 Japan; a second and lesser abundance is found in temp. N. Am., 

 and a few sp. in the arctic regions. 4 sp. in Mid. and S. Eur. , 5 in 

 Caucasus." (Drude.) Many sp. and hybrids cult. Shrubs and small 

 trees with leathery 1. ; the 1. of Azalea last one year, those of the 

 other subgenera usu. more. Large winter buds are formed covered 

 with scale 1. ; the larger and stouter ones contain infls., the slender 

 ones merely 1. The branch bearing an infl is continued by the 

 formation of a bud in one of the upper axils. Some of the Indian 

 sp. are epiph. The C is slightly -|-, and the sta. and styles bend up- 

 wards to touch the under surface of a visiting insect. R. ferrugineum 

 L. (alpine rose) is protandr. and visited by humble-bees. 



Rhodogeron Griseb. Compositae (4). i Cuba. 



Rhodohypoxis Nel. Amaryllidaceae (in). 2 S.E. Afr. 



Rhodolaena Thou. Chlaenaceae. 3 Madag. 



Rhodoleia Champ, ex Hook. Hamamelidaceae. 2 Hongkong to Java. 



Rhodomyrtus Reichb. Myrt. (i). 6 trop. and E. As., Austr. Ed. fr. 



Rhodopis Urb. (Rudolphia p.p. ). Leguminosae (in. 10). r W.I. 



Rhodora L. = Rhododendron L. p.p. (Eric.). 



