MARYLAND GEOLOGICAL SURVEY 859 



Description. Leaves of relatively large size, palmately trilobate, with a 

 somewhat decTirrent base, divided three-fourths of the distance to the base 

 by openly cuneate, ultimate rounded sinuses. Lobes diverging at angles 

 of from 45 to 50, linear-lanceolate or slender-conical, elongated, acumi- 

 nate, the middle one the same size as or slightly wider than the later lobes. 

 Margins entire. Texture subcoriaceous. Length about 17 cm. Petiole 

 stout, its length unknown. Midrib straight, stouter than the lateral pri- 

 maries. Lateral primaries suprabasilar, never observed to be opposite, but 

 diverging from the midrib at angles of about 45 from 2 mm. to 4 mm. 

 apart, slightly curved at first and then straight to the tip of the lateral 

 lobes. Secondaries thin, often obsolete, diverging from the primaries at 

 wide angles, often approaching 90, straight for two-thirds to three- 

 fourths of the distance to the margins where they turn abruptly upward 

 to form flat arches joining the secondaries next above. Tertiaries thin, 

 usually obsolete, forming relatively large three-sided, four-sided, or five- 

 sided, mostly isodiametric meshes. 



This handsome species is unfortunately represented by very fragmentary 

 material, the long slender lobes being usually broken away. It was 

 described from Cliffwood Bluff, New Jersey, in 1903, and subsequently 

 detected near the eastern border of Maryland. It is rather close to Ster- 

 culia lugubris Lesquereux * from the Dakota group, a species that has been 

 tentatively identified by the writer 2 from the Woodbine formation of 

 northeastern Texas. The latter has more ascending lobes, which are also 

 somewhat widened medianly. It has much stouter primaries, the laterals 

 being opposite and basal. 



Occurrence. MAGOTHY FORMATION. Deep Cut, Delaware. 



Collection. Maryland Geological Survey. 



1 Lesquereux, Cret. and Tert. Fl., p. 81, pi. vi, figs. 1-3, 1883. 



2 Berry, Bull. Torrey Bot. Club, vol. xxxix, p. 399, pi. xxxi, fig. 3, 1912. 



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