676 PARKS 



summer, when thirty-day droughts often occur. The Ocean and westward along the Gulf of Mexico. It has 



winters are open, with much freezing and thawing, and moderate summer temperatures with hot sunshine, 



there is little snow protection to be relied upon. short winters and abundance of rainfall (fifty to sixty 



Region 29 includes most of the cotton country, extend- inches), and is almost subtropical. 



ing from what is known as east Texas eastward and Region 31 is southern Florida, with exception of the 



northward to the Atlantic Ocean in North Carolina and subtropical fringe. It is subject to annual frosts and 



Virginia. It lies between the Piedmont region and the has rather warm summers and a rainfall of over fifty 



swampy lower coastal plain that borders the Gulf of inches. The vegetation approaches the subtropical, 



Mexico and the Atlantic Ocean. The rainfall is abun- oranges, palms and the Grevillea or silk oak succeeding. 



dant, being from forty-five to sixty inches except Region 32 is the tropical coast of southern Florida. 



toward the last of the rather warm summer, when a It has slight range of temperature with no frosts and a 



thirty-day drought frequently occurs. rainfall of fifty to sixty inches. Palms and mangroves 



Region 30 is the swampy coastal plain from Wilming- are the typical vegetation, 

 ton, North Carolina, southward along the Atlantic 



TABLE i 



SOME HERBACEOUS PERENNIALS SUITABLE FOR USE IN DIFFERENT SECTIONS 



OF THE UNITED STATES 



Table I summarizes the principal features relating to the adaptation of different herbaceous perennials, 

 arranged in alphabetical order, showing their suitability in regard to season of blooming, height of growth, and 

 climatic requirements for use in various regions of the United States. 



Column I gives the scientific name of the plant. 



Columns 2 to 6 show by means of the symbol X the time of year when the flowers may be expected. The 

 date will vary according to latitude and altitude and to a small extent according to longitude. Thus if the symbol 

 appears in column 2, marked E, the blooms may be expected early in the flowering season; if in column 4, under 

 M, about midsummer; and if in column 6, under L, just before frost. Columns 3 and 5 denote intermediate 

 seasons. 



Columns 7 to 12 show by means of the symbol X the approximate height of the plant under ordinary con- 

 ditions. There will be much variation from this in many locations, depending upon adaptability of the plants 

 to the particular location. 



Columns Ri to R32, under "Regions," indicate the different locations, as shown on the map (Plate 254, page 

 674). In these regional columns the symbol I indicates that the plant requires irrigation during the dry season; 

 N indicates that the plant is native to the region; P indicates that special winter protection is required; X indi- 

 cates that in the region thus designated the plant may be expected to thrive under average care with respect 

 to water, shade and other cultural conditions, including special treatment that would be required for the 

 particular plant anywhere. 



