220 TAXONOMY OF VASCULAR PLANTS [Box. Absts., Vol. VII, 



genus Penstemon (commonly known as Pentstemon) in the area covered, in which 86 species 

 are listed, with 2 additional new species at the end. Keys to the groups and species are 

 given, and the following new names occur: Penstemon Jonesii, P. leptanthus, P. auriberbis, 

 P. parviflorus, P. dolius Jones, P. Paysonii, P. eriantherus saliens (Rydb.) Pennell, P. ophi- 

 anthus, P. parvus, P. magnus, P. leiophyllas, P. laevis, P. saxosorum, P. uintahensis, P. 

 cyaneus, P. cyananthus suhglaber (Gray) Pennell, P. cyananthus longiflorus, P. scariosus, 

 P. Garrettii, P. Caryi, P. strictus angustus, P. secundiflorus lavendulus, P. Osterhoutii, P. 

 versicolor, P. lentus, P. coloradensis Sileri (Gray) Pennell, P. procerus pulvereus, P. aggre- 

 gatus, P. obtusifolius, P. retrorsus Payson, P. caespitosus perbrevis, P. glabrescens, P. abie- 

 tinus, P. Tidestromii, P. mensarum. — S. F. Blake. 



1473. Piper, Charles V. A study of Allocarya. Contrib. U. S. Nation. Herb. 22:79- 

 113. 1920. — In this study of the genus Allocarya Greene, of the family Boraginaceae, 79 

 species are recognized from North America north of Mexico, of which 48 are described as new. 

 A key to the species is given, and distributed specimens are cited freely. The species are dis- 

 tinguished chiefly by characters drawn from the nutlets. The following are new: Allocarya 

 hystricula, A. acanthocarpa, A. oUgochaeta, A. echinacea, A. cristata, A. Eastwoodae, A. glyp- 

 tocarpa, A. spiculifera, A. anaglyptics, A. papillata, A. distanti flora, A. microcarpa, A. ori- 

 cola, A. divergens, A. asperula, A. Wilcoxii, A. setulosa, A. alipitata micrantha, A. Leibergii, 

 A. tuberculata, A. charaxata, A. amhigens, A. lonchocarpa, A. limicola, A. sigillata, A. cryo- 

 carpa, A. gracilis, A. laxa, A. pratcnsis, A. cervina, A. ramosa, A. calycosa, A. figurata, A. 

 vallata, A. undulata, A. minuta, A. scalpta, A. reticulata, A. areolata, A. inornata, A. media, 

 A. divaricata, A. interrasilis , A. insc^ilpta, A. dispar, A. gramdata, A. conjuncta, A. cor- 

 rugata, A. scalpocarpa.—S . F. Blake. 



1474. PiTTiER, H. The Venezuelan mahogany, a hitherto undescribed species of the 

 genus Swietenia. .Tour. Washington [D. C] Acad. Sci. 10: 32-34. 1920. — Though the tree 

 has long been known economically, the Venezuelan mahogany has never before been 

 criticall}^ studied and is now described as a new species, Swietenia Candollei. — Helen M. 

 Gilkey. 



1475. PoupioN, J. L'Inobulbon muniScum Kranzlin. Rev. Hort. [Paris] 92: 64-66. 

 Fig. 15-16. 1920. 



1476. Rehder, Alfred. New species, varieties and combinations from the herbarium 

 and the collections of the Arnold Arboretum. Jour. Arnold Arboretum 2: 42-62. 1920. — The 

 present article deals with Rosaceae. A classification of all the known species of Malus is given, 

 and one new section, Chloromeles (Decne.), and new subsections are proposed. The following 

 species, varieties, forms, and combinations based on spontaneous material are new: Aronia 

 arbutifoliaL leiocalyx and f. macrophylla,Photinia villosa var. coreana (Decne.), y. Amelanchier 

 grandiflora (Zabel) =A. canadensis X laevis Weigand, Malus kansuensis f. calva, M. honanensis, 

 M. Komarovii (Sarg.), M. coronaria var. dasycalyx, M. angustifolia f. pendula, Docyniadocy- 

 nioides (Schneid.), Pyrus ussuriensis var. hondoensis (Kikuchi & Nakai) and var. ovoidea 

 (Rehd.), P. Calleryana var. Fauriei (Schneid.). The following new hybrids, forms and com- 

 binations are based on garden plants: X Sorbus arnoldiana, Aronia arbidifolia va,T. pumila, 

 Amelanchier grandiflora f. rubescens, Malus baccala f. gracilis, M. florihunda var. brevipes, 

 M. coronaria var. dasycalyx f. Charlottae, M. ioensis f. plena, X M. robusta and var. persicifolia, 

 X M. sublobata (Zabel), X M. purpurea (Barbier), X Chaenomeles superba (Frahm) with several 

 forms, Pyrus Calleryana f . graciliflora and f tomentella and X P. congesta. There are also 

 critical notes on other species of some of the genera mentioned above. (See also Bot. Absts. 

 4, Entries 1758, 1759.)— Alfred Rehder. 



1477. Rehder,. Alfred. Tetraplasia, a new genus of Rubiaceae. Jour. Arnold Arbore- 

 tum. 1:190-191. 1920. — Tetraplasia biflora, new genus and new species, related to Plec- 

 tronia and Vangucria, is described; it is endemic to the Liukiu Islands. — Alfred Rehder. 



