196 



LOWER EOCEXE FLORAS OF SOUTHEASTERN NORTH AMERICA. 



Occurrence. — Groiuula format ion, (ii'i'iiiula(?), 

 Grcnarlii County, Miss, (colloctt'il hy J']. N, Lowo 

 and K. W. liorry). Wilcox jjrou|), 1 niilo north- 

 west of Hcnton on ^lililarv road (Hyton pit). 

 Saline County, Ark, (collected l)y E, W. Berry); 

 one-fourth mile above Coushatta, Red Kiver 

 Parish, La. (collected bv A. C. Vcatch); sec. 1 1 . 

 T. 12 X,, R. 12 W, (coHccted by L. C. Chap- 

 man); and 2 miles south of Xaborton, De Soto 

 Parish, La. (collected by O. B. Hopkins). 



Collections. — U. S. National Museum; New 

 York Botanical Garden. 



Artocarpus dubia HoUick. 

 Plates XXIX, fiijure 2, and CXIII. figures 1 and 2. 



Artocarpus dubia. HoUick, in Harris, G. D., and Veatch, 

 A. C, A preliminary report of tlie geology of Louisi- 

 ana, p. 281, pi. 38, fig. 3, 1899. 



Description. — Leaves relatively small, 

 broadly ovate, variable in size and outline, 

 normally ti-ilobate tlirough the development of 

 a narrow oblique lateral sinus in the middle 

 part of the leaf on each side, which extends 

 about half the distance to the midrib and is 

 narrowly rounded proxhuad, witli ai)proxi- 

 mateh' parallel sides. In some specimens this 

 sinus is not developed on one side, which is then 

 entire. Tenninal hjbe very broadly ovate hi 

 outline, inequilateral, acutely pointed. Basal 

 lateral lobes unsjTnmetric, but sliglitly pro- 

 duced, directed outward and upward, with 

 short, slightly curved distal margins and long 

 and fuUy rounded outside margins, theh" tijis 

 bluntly pointed or roimded. Length ranges 

 from 11 to 14 centimetei-s. Ma.xinium width, 

 from tip to tip of the lateral lobes, 5 to 10.5 

 centimeters. Apical lobe from 7 to 9 centi- 

 meters in length and from 3.3 to 6 centimeter 

 in maximum width. Base ])roa<lly cuneate. 

 Leaf margin as a whole entire but irregularly 

 undulate. Midril) stout and promhicnt on the 

 lower surface of the leaf. Secondaries thm, 10 

 to 12 pairs, branclung from the midrib at angles 

 of 45° or more and nearly straight except near 

 the margins. A craspedodrome secondary 

 runs to the tip of each lat('ral lobe, and the 

 oth<?rs !ire camptodrome, l)ecoming normally 

 attenuated and almost imperceptibly merging 

 in the tertiary arcolation. Tertiary system 

 more or less obscm-ed ; wiler(^ seen it shows 

 nearly straight percun-ent ner^■illes with straight 



cross nervilles, togetlier fonning approximately 

 rectangidar ai-eohi'. 



This leaf is mucli smaller than most leaves 

 that are referred to Artocarpus and "'■ may 

 possibly r(>present a young or sms'Il leaf of 

 Arfocarpvs Icusigiana (Lesquen^ux) Knowlton, 

 with which it is usually associated, or it may be 

 an abnonual leaf of tliat species. The present 

 fonu is not abundant and is confined to the 

 western Gnlf region and consequently to the 

 upper Wilcox. It is represented by several 

 specmiens and it preserves its essential features 

 from locality to locality so that if not a true 

 botanical s])eci(^s it is a form readily recognizable 

 wherever found. 



Occurrence. — Wdcox group, left bank of Red 

 River, one-fourth mile above Coushatta, Red 

 River Parish, La. (collected by G. D. Han-is); 

 \l miles southeast of Naborton (collected by 

 O. B. Hopkins) and sec. 11, T. 12 N., R. 12 W. 

 (collected by L. C. Chapman), De Soto Parish; 

 and Shreveport, Caddo Parisli, La. (collected 

 by O. B. Hopkins). 



Collections. — U. S. National Museum; New 

 York Botanical Garden. 



Genus PSEUDOLMEDIA Trecul. 



PsEUDOLMEDiA EOCENiCA Berrv, n. sp. 

 Plates XXVII, figui-e 3, and XXVllI, figure 2. 



Description. — Leaves oblong-lanceolate in 

 outline, ranging from 7 to 12 centimeters in 

 length arid from 1.75 to 2,25 centimeters in 

 maximum widtli, wliich is in the middle part 

 of the leaf. Base narrowly cuneate pointed. 

 Apex gradually narrowed and produced as an 

 elongate acumen. Margm entu-c, more or less 

 undulate, partly because more or less revolute. 

 Midrib very stout. Secondaries stout, nu- 

 merous, at mtervals of 3 to 5 mUlimetere, 

 diverging from the midrib at wide angles, 

 almost 90"", pursuing a straight course to the 

 marginal region, where then- tips are con- 

 nected by flat arches. Te.xturo coriaceous. 



This s})ecies has leaves of a type ordinarily 

 referred to the geiuis Ficus, some forms of 

 wliich it greatly resembles, as, for example, the 

 existing Ficus ciisjndatd Blume of tlie East 

 Indies. It also resembles the leav<>s of sev(>ral 

 species of the allied genus Olmedia l)ut is most 

 similar to the closely related genus Pseudol- 

 media Trecul, especially the West Indian 



