274 



LOWER EOCKNE FLORAS OF SOrXHEASTERN XORTll AMERICA. 



Toxturo siibcoriiicodus. Po.tiohiU* not pm- 

 servoil. Midrib vorv stout proxiinail l)ut thins 

 consiclerably distad. Socoudarios tiiiii, about 

 12 irn'trularlv spaced pairs. Thoy branch from 

 the midrib at did'oront angles. In tlio lower 

 half of the leaflet the angles are about 45° and 

 the secondaries are curved ami camptodrome. 

 In th(j upper part of the leafl«(t the angles 

 become jjrogressively more op*'n until they 

 reach about 80°. The secondaries are straiglit 

 to the marguial region, when' their ends any 

 jomed by a wide fiat arch. Tertiaries mostly 

 obsolete. 



This species appeai-s to be new. I'nfortu- 

 natelj' it is represented oidy by the specimen 

 figured, whicli was collected many years ago 

 by the Arkansas Geological Survey and is in 

 the United States National Museum (No. 8610), 

 and l)y another specimen from Wilson Comity, 

 Tex. The specinien first mentioned was iden- 

 tified as Sapindus sp. by Prof. Ward. 

 • Occurrence. — Wilcox group, east of Benton, 

 Saline County, Ark. (the locality giv3n is sec. 

 28, T. 2 S., il. 14 W.). Beds of Wilcox age, 

 Calaveras Creek, Wilson County, Tex. (collected 

 hy ^Vlexander Deussen). 



Collection. — U. S. National Museum. 



Sapindus knowi.to.m Berry, n. sp. 



Plate LXIII, figure 6. 



Description. — Leaflets of medium size, ovate- 

 lanceolate, slightly inecjuilateral and falcate in 

 general outline, the base broadly rounded and 

 the tip elongated, acuminate. Length about 

 8.5 centimeters. Maximum width, in the basal 

 half of the leaflet, about 2.1 centimeters. 

 Margins entire, slightly irregular in the even- 

 ness of tlieir curvature, opposite at the base 

 and similarly urclied on both sides of the mid- 

 rib, the base, however, being inequilateral in a 

 ratio of 8.5 to 11. Leaf substance relatively 

 thin but texture apparently subcoriaceous. 

 Petiolnle enlarged, stout, nearly straiglit, 

 forming an angle with the midril), about 6 mil- 

 limeters in length. Midrib stout, oblique with 

 respect to the ])etiolule, curved, prominent on 

 the lower surface of the leaflet. Secondaries 

 relatively thin but stouter than in the asso- 

 ciated snniU-leafed species of this genus, about 

 seven or eight alternate, somewhat irregularly 

 spaced pairs: they diverge from the midi-il) at 

 angles of about 50° and curve gently upward. 



the curve becoming accelerated in the nuirginal 

 region, where they are camptodrome. Ter- 

 tiary system iiiic hut distinct, consisting of 

 small four to si.x sided isodianu'tric meshes. 



This species, which is named in honor of 

 F. II. Knowlton, of the Uniteil States Geo- 

 logical Survey, is distinct from the associated 

 Wilcox species of Sapindus as well as from 

 previously descril)ed fossil forms. It resem- 

 bles several of the Wilcox species, how- 

 ever, especially Sapinelus formosus Berry and 

 Sapindus eoligniticus Berry, both of which are 

 slightly smaUcr and neither has such a long 

 and stt)ut pctiolule. Both of these species are 

 also more coriaceous and have thinner, more 

 regular secondaries, and the are(datiou is more 

 immersed. 



Among existing species of Sapindus the pres- 

 ent form can scarcely be distinguished from 

 Sapindus marginatus WiUdenow, a small coastal 

 tree of the Florida peninsula. 



Occurrence. — Wilcox group, Benton, Saline 

 County, Ark. (collected by K. E. Call). La- 

 gi'ange formation (in beds of Wilcox age). Pur- 

 year, Henry County, Tenn. (collected by E. W. 

 Berry). 



Collections. — L^. S. National Museum. 



Sapindus mississippiensis Berry, n. sp. 



Plates LXIII. figure 1, LXIV, figure 10, LXVI, figures 

 1 and 2, and C IX, figure 1. 



Sapindus angustifoliKS Lesquereux. Ilollick, in Harris, 

 G. D.,andVeatch, A.C., A preliminary report on the 

 geology of Louisiana, p. 286, pi. 35, fig. 5, 1S99. 



Loughridge, Report on the geological and economic 

 features of the Jackson's purcha.se region, p. 198, 

 1888. 



Lesquereux, U. S. Nat. Mus. Proc, vol. 11, p. 12, 1888 

 (not 1873, 1878). 



Veatch, U. S. Geol. Survey Prof, Paper 46, )il. 17, 

 fig. 6, 1906. 



Description. — Leaves odd-i>innate. Leaflets 

 small, slightly inequilateral, acuminate-lanceo- 

 late in outline, invariably more or less falcate. 

 Ape.x somewhat abruptly narrowed and pro- 

 longed as a slender acumen. Base cuneate, 

 in many specimens narrowly pointed and 

 matching the apex. Length ranges from 4 to 

 6.75 centimeters. Maximum width, halfway 

 Ix'tween the apex and th(> base, 1.4 or 1.5 cen- 

 timeters. Margins entire, rather evenly curved. 

 Texture std)coriaceous. Petiolnle generally 

 wanting, stout and 4 centinu'ters long ui one 

 specimen. Midrib stout and curved. Sec- 



