No. 2, March, 1921] TAXONOMY OF VASCULAR PLANTS 221 



1478. Rehder, Alfred. New species, varieties and combinations from the herbarium 

 and the collections of the Arnold Arboretum. Jour. Arnold Arboretum 1: 191-210. 1920. — 

 The present continuation of this paper deals with Saxifragaceae and Ranunculacae and a 

 few Pinaceae, Taxaceae, and Liliaceac. Besides many horticultural forms the following 

 species, varieties, and combinations are new: Juniperus squamata f. Wilsonii, Paeonia suf- 

 fntiicosa var. spontanea, Clematis paniculaln var. dioscoreifolia (Lev. & Vaniot), Philadelphus 

 rhombifolius from Japan, P. subcanus var. Wilsonii (Koehne), P. Delavnyi var. calvescens, P. 

 pekinensis var. dasy calyx, P. laxus var. strigosus (Beadle), Fendlera linearis from Mexico, 

 F. rupicola var. falcata (Thornber), Deutzia heterotricha from Japan, and D. calycosa var. 

 macrnpetala from China. — Alfred Rehder. 



1479. Rexdle, a. B. Poa omeiensis comb. nov. Jour. Botany 58: 25. 1920. — A new 

 name made necessary by the discover^' that P. gracillima Rendle is antedated by P. gracillima 

 Vasey. The plant in question is a Chinese species. — K. M. Wiegand. 



1480. RiDDELSDELL, H. J. British Rubi, 1900-1920. Jour. Botany 58: 101-104. 1920.— 

 This is a summary of the changes made in the interpretation of the British Rubi since the 

 publication of Rogers' hand-book. Most of the changes are due to Rogers' work or have 

 have been done under his guidance. About fifty forms are mentioned. — K. M. Wiegand. 



1481. RiDDELSDELL, H. J. Some records, and rose records. Jour. Botany 58: 113-114. 

 1920. — Records of the occurrence of Callitriche, Zannichellia, Potamogeton, Eleocharis, 

 Carex, and various species of Rosa. — K. M. Wiegand. 



1482. Rock, Joseph F. The genus Plantago in Hawaii. .\mer. Jour. Botany 7: 195-210. 

 / pi. 1920. — A critical study of PlarUago in Hawaii. The author recognizes two species, 

 both endemic: P. princeps, with eight varieties, and P. pachyphylla, with seven varieties. 

 P. Queleniana Gaud, is reduced to a variety of P. princeps. Two new varieties, P. princeps 

 var. anomala and P. pachyphylla var. muscicola, are described, together with four new forms: 

 P. pachyphylla var. mauiensis forma montis eeka, P. pachyphylla var. kauaiensis forma ro- 

 busta, P. pachyphylla var. kauaiensis forma intermedia, and P. pachyphylla var. rotundifolia 

 forma crassicaudex. Three species of Plantago have been introduced into Hawaii. — E. W. 

 Sinnott. 



1483. RusBY, H. H. Codes of botanical nomenclature in the United States Pharmacopoeia. 

 Jour. Amer. Pharm. Assoc. 9:670-671. 1920. 



1484. Salmon, C. E. Alchemilla acutidens in England. Jour. Botany 58: 112-113. 1920 



1485. ScHELLEXBERG, G. Ueber einige Arten der Gattung Rourea Aubl. [Several 

 species of the Genus Rourea Aubl.] Bot. Jahrb. 56: 21-29. 1920. — This genus has been 

 very much misunderstood. The author in a previous contribution, in 1910, has shown 

 that Rourea as understood by Aublet is entirely American, and excludes the African Byrso- 

 carpus and the Asiatic Santaloides. The author's early studies, based mainly on anatomical 

 considerations, were primarily concerned with generic and subgeneric' relationships and lim- 

 itations. The preparation of a monograph for "Das Pflanzenreich" has brought out new in- 

 formation with regard to species, and has led to this paper. Material named Rourea frutes- 

 cens Aubl. by most authors has been Connarus pubescens DC, or Rourea pubescens Radlk., 

 or in some cases R. surinamensis Miq., or even Cnestidium rufescens Planch. R. surinamensis 

 Miq. also has been misunderstood, and has been confused with R. revoluta Planch., and R. 

 glabra HBK. R. oblongifolia Hook. & Arn. is apparently a synonym of R. glabra HBK. 

 Urban's R. cubensis and R. sympetala are to be referred to R. glabra. Of Baker's three 

 varieties of R. glabra only one, var. parviflora, is really a variety of this species. Grisebach 

 confused also R. paucifoliolata Planch, with R. glabra. R. oblongifolia Hook. & Arn. and 

 R. glabra HBK. are synonymous. The author notes that he was previously in error in the 

 statement that the genus Rourea is characterized by sclerenchyma cells in the leaves. Only 



