Floristik, Geographie, S5'-stematik etc. 203 



Senecio bengiietense , S. confitsiis, S. rubigbiosus , S. mindoroensis 

 and Chrysogoniini phUippviense. Trelease. 



Eimer, A. D. E., New Pmidanaceae from Mt. Banabao. (Leaflets 

 of Philippine Botany. I. p. 78—82. Aug. 1. 1906.) 



Fveycinetia niotiocepJiala , Pandanus banabaensis and P. utilissi- 

 mus. Trelease. 



Erwin, A. T. and H P. Baker. Evergreens for the Iowa 

 planters. (Bull. 90, Iowa Experiment Station, Arnes, Iowa. p. 

 1 — 46. 15 halftone illustrations. Apr. 1907.) 



Prof. Erwin, the Associate Horticulturist and Prof. Baker, the 

 Forester, of the Iowa Experiment Station have brought together in 

 this bulletin the results of many years experimenting both by pri- 

 vate parties and by governmental agencies. Iowa, though classed 

 as a prairie State has about 13 per cent. of its area timbered and 

 some 200,000 acres have been planted to forest trees. The winters 

 are cold especially in the northern portion of the State and the 

 Summers are hot and often dry particularly in the western part. 



After noting the value of evergreen conifers for windbrakes, 

 for Ornament and for timber and giving directions for transplanting, 

 the authors procede to describe some 24 species of conifers, giving 

 notes on their adaptation to soil and climate, culture and utilization. 

 These notes cover 8 species of Pinits, 2 Larix, 5 Picea, 1 Pseudo- 

 tsuga, 1 Tsuga, 2 Abtes, 1 Taxodünn, 1 Thuja, 2 Junipenis, 1 

 Ginkgo. A few of the more striking species are noted below: 



Pirms strobus L., the white pine is a native of northeastern 

 Iowa. It grows on all classes of soils and attains a greater age 

 without signs of decline than any other pine. It requires protection 

 when young which may be given by planting a few rows of some 

 low-growing tree. The white pine can endure considerable shade 

 when young and is therefore well adapted for planting among 

 other trees. 



Pimis resinosa Ait., the red or Norway pine, is a native of 

 Northern New England and the lake states. It resembles the 

 Austrian pine {P. austriaca) which it equals in hardiness and rate 

 of growth while producing a superior grade of timber. It will grow 

 well on dry sandy soil and for the first 30 years outgrows the 

 white pine though it is finally outstripped b}' the latter. It produces 

 a good crop of seed only at rare intervals of ten years or more. 



Pinus ponderosa Laws., the bull pine, is native in the Rocky 

 Mountain region. It resists drouth well and has been widel}^ 

 planted in Iowa. It yields excellent, rather light timber which, 

 however, cannot be used for posts unless some preservative be 

 used. The tree forms a tap root and is hard to transplant, it cannot 

 stand shade or great humidity. 



Pinus austriaca Ait., the Austrian pine, is a hardy, rapid- 

 growing species easy to transplant and very useful for ornament 

 and for windbrakes. Its wood is of inferior qualit}'. 



Picea parryana Sarg., considered b}' many the most beautiful 

 Conifer, was introduced into cultivation by the well-known botanical 

 explorer Prof. C. C. Parry of Davenport, Iowa (born 1823, died 

 1890). It is a hardy, drouth-resistant species, ver}^ ornamental for 

 the first 25 years of its growth. The most beautiful sage green 

 varieties are propagated by grafting for ornamental purposes. 



