1923] SARGENT, NOTES ON NORTH AMERICAN TREES 99 



NOTES ON NORTH AMERICAN TREES, XI 1 



C. S. Sargent 



NEW SPECIES OF CRATAEGUS 



Crataegus Stevensiana (§ Crus-galli), n. sp. 



Leaves obovate, rounded at the broad apex, gradually narrowed and 

 cuneate at base, coarsely doubly serrate above the middle with acute 

 teeth, subcoriaceous, dark green and lustrous on the upper surface, dull 

 and paler on the lower surface, 3-4 cm. long and 2-2.5 cm. wide, with a 

 thin midrib and slender obscure primary veins; petioles slender, glabrous, 

 narrow-winged nearly to the middle by the decurrent base of the leaf 



blade, 7-10 mm. in length; leaves on vigorous leading shoots suborbic- 

 ular, rounded or minutely pointed at apex, broad-cuneate at base, finely 

 serrate above the middle, 3-3.5 cm. long and wide, their petioles broadly 

 wing-margined at apex, 5-7 mm. in length. Flowers opening about the 

 middle of May, 1.2 cm. in diameter, on slender pedicels in thin-branched 

 glabrous mostly 10-15-flowered corymbs, their bracts and bractlets 

 linear, scarious, caducous; calyx-tube narrow-obconic, glabrous, the lobes 

 gradually narrowed from a w T ide base, acuminate, coarsely serrate below 

 the middle, glabrous on the outer surface, slightly villose on the inner 

 surface; stamens 10, anthers yellow, styles 2 or 3. Fruit ripening late in 

 September, on slender pedicels, in drooping few-fruited clusters, short- 

 oblong to slightly obovoid, green tinged with red, 5-7 mm. long, 4-5 mm, 

 in diameter; calyx little enlarged, with a wide cavity pointed in the bottom; 

 flesh thin and dry; nutlets 2 or 3, rounded at the ends, only slightly ridged 

 on the back, 4-5 mm. long and 3-4 mm. wide, with a dark hypostyle 

 extending to the middle. 



An intricately branched shrub 1.5-3 m. high, with dark slightly scaly 

 bark and slender straight or zigzag glabrous branchlets, chestnut-brown 

 and lustrous during their first and second years, becoming dull gray-brown 

 and armed with numerous stout nearly straight dark chestnut-brown 

 spines 3-5 cm. in length. 



Kansas. Wilson County, thickets along small streams and on rocky hill- 

 sides, Neodisha, E. J. Palmer, No. 21158, May 5, 1922, Nos. 215G2 (type), 21374, 

 May 22, 1922, No. 22042, September 19, 1922. 



Oklahoma. Greer County, " occasional along creek in the mountains," 

 near Granite, G. W. Stevens, No. 2891, October 7, 1913. Kiowa County, 

 among rocks on granite hills, near Snyder, E. J. Palmer, No. 12586, July 18, 

 1917, No. 13075 October 26, 1917. 



This Kansas and Oklahoma species appears most closely related to 



Crataegus jasper ensis Sarg. of southwestern Missouri from which it differs 

 in its more coriaceous leaves rounded and not pointed at apex, smaller 



1 For part X see vol. III. p. 182. 



