Floristik und Systematik der Phanerogamen. 123 



Rydberq, P. A., So ine generic segregations. (Bulletin of 

 the Torrey Botanical Club. XXX. p. 271— 281. pl. 13— 14. 

 May 1903.) 



An analysis of some genera of Melanthaceae, Rosaceae, Loasaceae 

 and Scrophulariaceae , in an effort to give certain genera of these groups 

 coordinate value with tlie prevalent genera of the same groups. 



Zygadenas, of Michaux, is reduced to a Single species, Z. glaber- 

 rimus, with a rootstock and two glands on each division of the perianth. 

 The bulbous species, having only a Single gland on each perianth Seg- 

 ment, are arranged in two genera. Toxicoscordion n. gen., with the ovary 

 wholly free^ includes T. intermedium (Zygadenus intermedius Rydberg)^ 

 T. venenosiim (Z. venenosiis Watson), T. gramineiim (Z. gramineus Ryd- 

 berg), T. acutum (Z. acutus Kydberg), T. falcatum (Z. falcatus Rydberg)^ 

 T. paniculatum (Helonias paniculata Nutt.), T. Nuttallii (Amianthium 

 Nuttallü Gray), and T. Fremontii (Anticlea Fremontii Torrey). Anticlea 

 Kunth, with the ovary partly inferior, contains the following new combi- 

 nations. A. chlorantha (Z. chloranthus Richardson), A. virescens (Helo- 

 nias virescens H. B. K.)^ ^- elegans (Z. elegans Pursh), A. Coloradensis 

 (Z. Coloradensis Rydberg), and A. porrifolia (Z. porrifolia Greene). 



On the analogy of separating Dalibarda from Rubus and Dnchesnea 

 from Fragaria, the genus Rubus is reduced by the removal of the species 

 with club-shaped styles. The erect shrubs with glabrous styles and 

 drupelets capped by hard hairy cushions are arranged in a new genus^ 

 Rubacer, and the prostrate or reciining vines with hairy styles and no 

 cushions on the drupelets are placed in the new genus Oreobatus. The 

 following new names occur: Rubacer odoratuni (Rubus odoratus Lin- 

 naeus), R. parviflorum (Rubus parviflorus Nuttall), R. tonientosum (R. 

 velutinus Hook, and Arn.)^ R. Columbianum (R. odoratus Columbianus 

 Millspaugh), Oreobatus deliciosus (R. deliciosus James), and 0. Neo- 

 Mexlcanus (R. Neo-Mexicanus Gray). 



The United States species of Mentzelia in the current sense are 

 held to represent at least four distinct genera, of which one corresponds 

 to Watson's Mentzelia Bicuspidaria, another to Eaton and Wright's 

 Touterea, and another to Presl's Acrolasia. New names introduced in 

 this segregation are: Bicuspidaria tricuspis {Mentzelia tricuspis Gray), 

 B. involucrata (M. involucrata Watson), B. hirsutissima (M. hirsutissima 

 Watson^ Touterea decapetala {Bartonia decapetala Pursh)^ T. laevicaulis 

 (Bartonia laevicaulis Douglassj, T. Brande gei (M. Brandegei Watson)^ 

 T. parviflora (B. parviflora Dougl), T. pterosperma (M. pterosperma 

 Eastwood), T. striata (Hesperaster strictus Osterhout), T. Rusbyi {Mentze- 

 lia Rusbyi Wooton), T. Wrightii (M. Wrightii Gray), T. speciosa (M. 

 speciosa Oster.), T. densa {M. densa Greene), T. puniila {M. pumila Nutt.), 

 T. chrvsantha {M. chrysantha Engelmann), T. humilis {M. multiflora 

 humilis Gray), T. multiflora {Bartonia multiflora Nutt.)^ T. perennis {M. 

 perennis Wooton), Acrolasia congesta {M. congesta Nutt.), A. ctenophora 

 (M. ctenophora Rydb.)., A. Tweedyi {M. Tweedyi Rydb.), A. albicaulis 

 {M. albicaulis Douglass), A. tenerrima {M. tenetrima Rydb.), A. integri- 

 folia {M. albicaulis integrifolia Watson), A. compacta {M. compacta 

 Nelson), A. gracilenta {M. gracilenta Torrey and Gray), A. affinis {M. 

 affinis Greene), A aurea (Bartonia aurea Lind!.), A. nitens (M. nitens 

 Greene), A. Veitchiana {M. Veitchiana Kellogg), A. pectinata {M. pecti- 

 nata Kellogg), and A. micrantha (M. micrantha Torrey and Gray). 



The North American species of Synthyris, or Wulfenia, are held 

 to require similar subdivision, and the group of genera centering around 

 Veronica is analyzed into five genera: Wulfenia, Leptandra, Synthyris 

 and Besseya, in addition to Veronica. Of these genera, Besseya is charac- 

 terized as new, with the following species: Besseya alpina (Synthyris 

 alpina Gray), B. Bullii (Gymnandra Bullii Eaton), B. plantaginea (S. 

 plantaginea Benth.), B. reflexa {S. reflexa Eastwood), B. Ritteriana {S. 

 rltteriana Eastw.), B. rubra (Gymnandra rubra Dougl.), B. gymnocarpa 

 (Wulfenia gymnocarpa Nelson), and B. Wyomingensis {W. Wyomingensis 

 Nelson). Trelease. 



