RUBIALES. 



349 



ing a relatively straight course, camptodronie. 

 Tertiaries obsolete. 



This species is named from its great re- 

 semblance to Gucttarda rll'ipt'icd Swartz. a 

 small tree of tlie coastal r(>gion tiiat lias a 

 buttressed truni<: it inhabits tiie more soutiiern 

 Florida Keys, tlu- Baluunas, and the West 

 Indies. The g(>nus Gucttarda, which com- 

 jn'ises about 50 existing sjiecies, is chieily de- 

 veloped in tropical America. On(> species is 

 widely distriliutcMJ on maritime slmrcs from 

 tropical eastern Africa to Australia ami 

 Oceaiiica. its habitat forming a just com- 

 parison witli tliat of tlie fossil species. 



Occurrence. — Holly Springs sand, TToUy 

 Springs, Marsliall County, Miss. (collect(>(l by 

 E. W. Berry). Lagrange formation (iu l)eds 

 of Wilco.x age), Purycar, lltMirv County, Tenu. 

 (collected by E. W. Berry). 



Collections. — U. S. National Museum. 



Genus EXOSTEMA Richard. 



ExosTEMA psEl'DO^ARIB^^^r Berry, n. sp. 

 Plate ("VI, figure :!. 



Description. — Leaves small, lanceolate in 

 general outline, the apex and base narrowed 

 and acutely pointed. Length about 6 to 7 

 centimeters. Maximum width, midway be- 

 tween the apex and the base, about 1.75 centi- 

 meters. Margins entire, slightly irrcgidarly 

 curved. Leaf substance thin. Petiole stout, 

 terete, swollen in its lower part, about 7.5 milli- 

 meters in length. Midrib stout below, becommg 

 thin distad. Secondaries numerous, thin; 

 about 10 pairs diverge from the midrib at 

 different angles, averaging between 45° and 

 50°, and are as a rule but slightly curved until 

 they reach the marginal region, where they 

 become subparaUel with the margins in the 

 usual camptodrome manner. Tertiary venation 

 distmct, consisting of marginal arches and of 

 intermediate veins from the midrib, parallel 

 with the secondaries, combined with cross 

 nervilles in <lifferent directiims, forming rela- 

 tively large four, five, or six sided areoUe. 



This species is containc^d in old collections 

 from Wickliffe, Ky., labeled Sapindus duhius. 

 It is almost identic;al in all its characters with 

 the existing Kxostema carihxum Koemer and 

 Sc-hultes, which ranges from the Florida Keys 

 through the Antilles, the coast region of south- 

 ern Mexico and Central Aiucrica, and occurs 



also 0T\ tlu' Pacific coast of Central America. 

 The g(Mms consists of about a score of sjiecies 

 of slu'ubs and small trees, (>xclusively American 

 and conlined to tlie Tro])ics and subtropics. 

 Tiu\v are most abundant on tlie Antill(>s, and 

 oidv Exostema car'ihnum reaches the Morida 

 Muviidand. So far as I know th(> genus has not 

 been previously recognized in the fossil state. 



Occurrence. — IloUy Springs sand. Early 

 Grove, Marshall County, Miss, (collected by K. 

 W. Beny). Lagrange formation (in beds of 

 Wdcox age), Wickliffe, Ballard County, Ky. 

 (coDected by R. II. Loughridge). 



Collections. — U. S. National Museum. 



Genus PSVCHOTRIA Linne. 



PSYCHOTKIA GHAXDIFOLIA Engclliardt. 



Plale <'V. (iijun! 1. 



Psychnlrin /jram/i/ntm. Knufelhardt, Seiickcnbergisclie 

 naturf. (lescll. Abh., vol. 10, ]>. G56, pi. 11, fii;. 4, 



isni. 



Description. — Leaves large, oblong lanceo- 

 late in general outline, greatly elongated, 

 widest in the middle part, tapering upward 

 to the a])ruptly narrowed and bluntly pointed 

 tiji, and id)ruptly to the broadl}^ cuneate base. 

 Length about 21 centimeters. Maximum 

 width, midway between the apex and the base, 

 about 6.5 centimeters. Margins entire, full, 

 and somewhat undulate. Texture coriaceous. 

 Petiole not preserved, obviously very stout. 

 Midrib stout and prominent. Secondaries 

 stout; about 15 or 16 pairs diverge from the 

 midrib at angles of about 70°, curving regu- 

 larly upward and camptodrome in the marginal 

 region. Tertiaries form pseudosecondaries, al- 

 ternating with the true secondaries. Areola- 

 tion fine, largely immersed. iVn imcommouly 

 small leaf measures but 11.3 centimeters in 

 length by 33.5 millimeters in maximum width. 



The present strikhig species may be compan^d 

 with the Wilcox species Anona wilcoxiana 

 Berry or A. eaUgnitica Berry, but it does not 

 et)ual the largest leaves of A. ampla Berry. It 

 differs from the latter species in its much 

 narrower, slightly inerpiilateral, less pointed 

 form and in the details of venation. It is 

 much moi'c elongated and straight-sided than 

 the other two Wilcox species ])reviousiy 

 . mentioned, with narrower tip and base and 

 more numerous secondaries. Of the two it 

 is perhaps closest to 1h(> larger leaves of AuonM 



