FLORA 01- THE CHEYKNNE SANDSTONK OK KANSAS. 



215 



whole wnth the outer margins broadly decur- 

 rent and joining the lamina of the leaflet next 

 below at the point of junction of its inner 

 margin with the rachis. Certain specimens 

 show all the leaflets petiolate, a feature largely 

 emphasized in a specimen from Stump Neck, 

 Md., figured by me in 1911, showing three 

 terminal leaflets with petioles 3 to 4 centi- 

 meters in length. 



The leaflets in this species are much more 

 commonly petiolate and lacking in the winged 

 rachis than those in S. variabilis, in this par- 

 ticular closely resembling the leaflets of the 

 modern Matayba apetala, in which the rachial 

 wings are vestigial. Leaf substance thick and 

 leathery; epidermis firm and glossy. Leaflets 

 commonly suboppositc, often markedly so, 

 forming an acute angle with the rachis. Mid- 

 ribs stout and prominent below. Secondaries 

 slender, seen only on the under surface of the 

 leaflets and even there made out with diffi- 

 culty, eight to ten pairs, branching from the 

 midrib at a rather wide angle, especially in the 

 central part of the leaf; the angle is more 

 acute basally, curving upward ultimately to 

 join a short branch of the secondary next 

 above. Tertiaries fine, forming lax subrhom- 

 bic areolae where visible. 



This species is very common at certain 

 localities in the Patapsco formation of Mary- 

 land and Virginia, although at other outcrops 

 of this same formation it has not been detected. 



The grounds for the separation of this 

 species from 5. i-ariahilis are slight, as both are 

 variable and the larger forms of S. variabilis 

 are quite as large as the smaller forms of 

 S. magnlfolia. In the Patapsco formation 

 the two species are found in association at all 

 the localities where either occurs, and the 

 smaller species is usually the more common, 

 as if the larger species represented its occa- 

 sional more robust forms. On the other 

 hand, S. magnifolia has not been detected in 

 the abundant remains referred to S. variabilis 

 found at Oak Creek, Wyo., and there is com- 

 monly considerable disparity in size between 

 the two. There are certain other differences 

 which appear to l)e constant. These are the 

 thicker, relatively longer leaflets of S. magni- 

 fjlia, with less numerous and somewhat more 



ascending secondaries, which are not connected 

 distad by relatively flat arches. 



The form recorded from the Cheyenne sand- 

 stone as Rhxis tidderd Lesquereux belongs to 

 this species, and I am convinced that this is true 

 of Lesquereux's type material recorded from 

 the Dakota sandstone and collected, according 

 to J. A. rdden, '"from the west slope of the 

 Smoky Hill Buttes near Salemburg post office, 

 Saline County, Kans." There are a number 

 of other species described by Lesquereux in 

 the "Flora of the Dakota group" which, 

 although I do not fool justified in transferring 

 them to Sapindopsis, are open to more or less 

 suspicion. These are Aralia masoni Lesque- 

 reux." collected 10 miles northeast of Delphos, 

 Kans., which might represent the terminal 

 part of a Sapindopsis leaf; Laurus angusta 

 Heer,^' which is a fragment from Ellsworth 

 County, Kans., that in both form and venation 

 agrees with Sapindopsis; Leguminosites hymeno- 

 p7)>/nus Lesquereux,^" which is somewhat less 

 similar to the known species of Sapindopsis; 

 Sapindns diversifolivs Lesquereux," from Ells- 

 worth County, Kans., which is also less similar 

 to the known species of Sapindopsis; and RJtns 

 powdliana Lesquereux,^' obtained near Fort 

 Harker. Kans., wliich differs from Sapindopsis 

 in the suliordinate lobing and small leaflets 

 developed at the base of the proximal lateral 

 leaflets, in these features resembling RTius, but 

 which is sufficiently like Sapindopsis to be 

 open to more or less suspicion. 



This species has been found in the Cheyenne 

 sandstone at the black hills near Belvidcre 

 (773); Osage Rock, Belvidere (2217, 2232, 

 7406) ; Stokes Hill 100 yards south of National 

 Corral (2219); Stokes Hill (2220); Thompson 

 Oeek near the flume, 2 miles northwest of 

 Belvidere (2221); near Medicine Lodge Creek, 

 2 miles west of Belvidere (2224); left bank of 

 middle branch of Champion (Wildcat) Draw, 

 half a mile south of Belvidere (2229); shale 

 along right branch of Champion (Wildcat) 

 Draw (2228) ; and right bank of middle branch 

 of Champion (Wildcat) Draw (2231). 



" Lesquereux, Leo, U. S. CeoL Survey Mon. 17, p. 133, pi. 15, flg.4, 1S92. 



» Idem, p. 93, pi. 16, ng.7. 



» Idem, p. l.'>2, pi. 55, flgs. 7-9. 



" Idem, p. l.V>, pi. M, flg. 18. 



"Idem, p. 15.5, pi. 56, flgs. 4, 5. 



