SCIENTIFIC AND POPULAR. 325 



1738. ROBINIA, L. Locust tree. Papilionaceae . 



Named for Jean and Vespasien Robin, royal gardeners, Paris, 

 17th Century. Syn. Pseudo- Acacia, Medic. Trees or shrubs 

 with showy flowers in racemes. About 6 species, N. America; 

 4 in U. S. 



«. R. Pseiidaeacia L. (P. vulgaris Medic, P. odorata Moench.). 

 Southeasiern U. S. and much planted as a shade and timber 

 tree. Locust tree, Yellow Locust, Black or Common Locust, 

 Post or White Locust, Honey Locust*, North American Locust 

 tree. Pea-flower Locust, Basiard or False Acacia, Silver-chain^, 

 White Laburnum, Whya tree; Ger. Falsche Acazie; Fr. Robi- 

 nier. Bark of root tonic, emetic, narcotic. Timber strong and 

 durable. 



Other indigenous species are (b) R. hispida L. (P. hispida 

 Moench). Ro^e Acacia, Moss Locust, Bristly Locust, and (c) 

 R. viseosa Vent., Clammy Locust, Red-flowering or Rose- 

 flowering Locust, Rose Acacia*. 



1739. ROCCELLA, DC. Archil, etc. Parmeliaceae. 



Probably from the Italian, Orcella. Lichens. 



A. R^ tinctoria Ach. Mediterranean region, Canary Tslands, 

 Azores, etc. Archil Lichen, Orchil, Orchella, Canary Moss, 

 Dyer's Moss, Cape- weed. From this and (b) R. fusiformis 

 Ach., Angola- weed, Mauritius-weed, Flat Archil or Orchil, i» 

 obtained litmus. See Lecanora. 



1740. ROMANZ6FFIA,Cham.(Romanzovia).Hydrophyllaceae. 



Named for Count Nicholas Romanzoff*. Delicate pale herbs. 

 Two known species, Alaska to California. 



1741. ROMNEYA, Harv. Romneya. Papayeraceae. 



Glauc«»us herb. One species, California. 



1742. RORtPA, Scop. 1760 (originally Rorippa). Cruciferae. 



Syn. Nasturtium, R. Br. 1812; Armoracia Si^ymbrium, Coch- 

 Icaria, Neobeckla, in part Herbs, more or less pungent. 

 About 25 species, mostly of north temperate zone; 22 in IJ. S. 



:a, R. Armoracia (L. ) A. S. Hitchcock (C. \.rmoracia L. (Kew), 

 N. Armoracia Fries., A. sat va Bernh. ). Europe, cult, and 

 nat. in U. S. Hoiseradish; Ger. Meerrettig; Fr Raifort. Craa 

 de Bretagne, Moutarde des moines; Sp. Rabau) rusticano. 

 Fresh root pungent, diureti*', condiment 



b. R. Nasti'irtiuin (L.) Rusbv (S. Nasturtium L.,N. offi<^inale R. 

 Br.). Europe, northern Asia. nat. m U. S. and widely else- 

 where. Wa'er-cres", Comrao i or True Water-cres^ (Crashes, 

 Carsous, Kars, Kar<e), Brown Cress, Water-grass (Ireland), 

 Water-kers. Well-grass, Brook-lime, Eker. Tengtongues; Ger. 

 Brntinenkresse; Fr. Cre<son de fontaine (Codex); Sp. Berro. 

 Fresh plant antiscorbutic, used for salad. 



■c R. paliistris (L. ) Bess. (S. araphibiura var. palustre L., N. 

 palustre DC. (Kew), N. tnrrestre R. Br.). Europe, Asia and 

 N. America. Marsh or Yellow Water-cress, Yellow Wood- 

 cress, Bell-ragges. This and other species have properties of 



(b). 



