DISTRIBUTION OF VEGETATION IN UNITED STATES. 



49 



Evergreen Broad-Leaved Trees of the Uniibd States — continued. 



Peninsular Florida group — conlinued: 

 Ilex krugiana Loesn. 

 Jacquinia keyensis Mez. 

 &ugiodendron ferreum (Vahl.) Urb. 

 Laguncularia racemosa (L.) Gaertn. f. 

 Lysiloma bahamensis Benth. 

 Mimusops parvifolia (Nutt.) Radlk. 

 Ocotea catesbyana (Michx.) Sarg. 

 Oreodoxa regia H. B. K. 

 Picramnia pentandra Sw. 

 Pithecolobium guadalupense Chapm. 

 Prunus sphairocarpa Sw. 

 Pseudophcenix sargentii Wend. 

 Psychotria undata Jacq. 

 Rapanea guianensis Aubl. 

 Reynosia septentrionalis Urb. 

 Rhacoma crossopetalum L. 

 Rhizophora mangle L. 

 Rhus metopium L. 



Peninsular Florida group — continued: 

 Sapindus saponaria L. 

 Schaefferia frutescens Jacq. 

 Schoepfia chrysophylloides (A. Rich.) 



Planch. 

 Sideroxylon fcctidissimum Jacq. 

 Simaruba medicinalis Endl. 

 Swietenia mahogoni Jacq. 

 Terebinthus simaruba (L.) W. F- 



Wight. 

 Thrinax microcarpa Sarg. 

 Thrinax parviflora Sw. 

 Torrubia longifolia (Heimerl.) Britton. 

 Trema floridana Britton. 

 Xanthoxjdum coriaceum A. Rich. 

 Xanthoxylum flavum Vahl. 

 Ximenia americana L. 

 Zygia unguis-cacti (L.) Sudw. 



CUMULATIVE DISTRIBUTION OF MICROPHYLLOUS TREES. (PLATE 3.) 



This group comprises plants which are trees in form and reach a 

 height of 15 feet or more, being characterized by leaves which are 

 either simple and very small or have pinnate or bipinnate leaves with 

 small leaflets. Several species have been comprised which have green 

 stems and leaves which are of very short duration or wholly absent. 

 The members of this group merge into the much larger class of shrubs 

 in the southwestern United States which possess a similar character. 

 Eight of the species which have been used are extremely common as 

 shrubs, but frequently become trees within the limits of our definition. 



Microphyllous trees are most strongly represented in the United 

 States in southern Texas and southern Arizona. The maximum north- 

 ward extension of individuals of this group reaches northern Texas 

 and the southern portion of Nevada, due to the range of Prosopis 

 glandulosa. The cumulative distribution of this group, as well as of 

 the group just considered, is shown in plate 3. The twenty-three 

 species used in constructing this map are as follows : 



Microphyllous Trees of the United States. 



Acacia farnesiana Willd. 

 Acacia greggi i Gray. 

 Acacia wTightii Benth. 

 Brayodendron texanum (Scheele) Small. 

 Canotia holacantha Torr. 

 Cercidium floridum Benth. 

 Cercidium torreyanum (Wats.) Sarg. 

 Condalia obovata Hook. 

 Holacantha emoryi Gray. 

 KceberUnia spinosa Zucc. 

 Leucsena glauca (L.) Benth. 

 Leucsena greggii Wats. 



Leucsena pulverulenta (Schl.) Benth. 

 Olneya tesota Gray. 

 Parkinsonia aculeata L. 

 Parkinsonia microphylla Torr. 

 Parosela spinosa (Gray) Heller. 

 Pithecolobium brevifolium Benth. 

 Pithecolobium flexicaule Coulter. 

 Porhera angustifoUa (Engelm.) Gray. 

 Prosopis glandolosa Torr. 

 Prosopis pubescens Benth. 

 Prosopis velutina Wooton. 



