516 EXPERIMENT STATION RECORD. 



Those described as new are: Panicum linear if olium, P. equilaterale, P. 

 implicatum, P. wrightianum, Chcetochloa latifolia, Stipa williamsii, 8. 

 nelsoni, S. minor, Muhlenbergia palustris, Sporobolus palmeri, S.thurberi, 

 8. simplex, Agrostis paludosa, Trisetum argenteum, Zeugites pringlei, Era- 

 gro&tis viscosa,Poa capillaris, P.juncifolia, P. hanseni, P. atropurpurea, 

 P. longipedunculata, Agropyron elmeri, A. brevifolium, Pignuts capitqtus, 

 E. hanseni, and E. ciliatus. Elymus saxicolus Scribner and Smith and 

 E. simplex Scribner and Williams are also described. In addition to 

 the above a few new combinations are given as a result of changes in 

 nomenclature. 



The principal poisonous plants in the United States, V. K. 

 Chesnut ( U. 8. Dept. Agr., Division of Botany Bui. 20, pp. 60, Jigs. 

 S4). — The author has given concise and illustrated descriptions of many 

 of our most common poisonous plants, the number considered embrac- 

 ing about 50 species. The arrangement of the plants is according to 

 the scientific classification at present most generally accepted, but by 

 the liberal use of common names and a brief outline of geographic dis- 

 tribution any of the species would be easily recognized. The following 

 are the species enumerated: Fly ainanita {Amanita muscaria), death 

 cup (A. phalloides), American false hellebore ( Veratrum viride), lily- 

 of-the-valley (Convallaria majalis), showy lady's slipper (Cypripedium 

 regince), larger yellow lady's slipper (G. Mrsutum), smaller yellow lady's 

 slipper (C. parviflorum), corn cockle (Agrostemma githago), aconite 

 {Aconitum colnmbianum), larkspurs {Delphinium trieorne, D. geyeri, D- 

 menziesii, D. recurvatum, and D. trollii folium), black cherry {Prunus 

 serotina), Kentucky coffee tree {Gymnoeladus dioiea), woolly loco weed 

 [Astragalus mollissimus), stemless loco weed (Aragallus lambertii), rat- 

 tlebox {Grotalaria sagittalis), caper spurge {Euphorbia lathyris), snow- 

 on-the-mountain {E. marginata), poison ivy {Rhus radicans), poison oak 

 (R. diversiloba), poison sumac {R. vernix), red buckeye (JEsculus pavia), 

 water hemlock {Cicuta maculata), Oregon water hemlock (0. vagans), 

 poison hemlock (Conium maculatum), broad-leaf laurel {Kalmia latifo- 

 lia), narrow-leaf laurel {E. angustifolia), great laurel {Rhododendron 

 maximum), stagger-bush {Pieris mariana), branch ivy {Leucothoe cates- 

 baii), false jessamine {Gelsemium semper vir ens), Jimson weeds {Datura 

 stramonium, and D. tatula), black nightshade (Solatium nigrum), bitter- 

 sweet {8. dulcamara), spreading nightshade {S. triflortim), and sneeze- 

 weed {Eelenium autumnale). 



Hybrids and their utilization in plant breeding, W. T. Swingle 

 and H. J. Webber (U. S. Dept. Agr. Yearbook 1897, pp. 383-420, pis. /, 

 figs. 13). — The authors have given a statement concerning hybrids 

 and their utilization in plant breeding, most of the information being 

 compiled. Hybrids are defined and the methods of producing them 

 are fully explained. Notes are also given on plants which may be 

 hybridized and the effect of the different crossings on the hybrid 

 progeny. 



