600 PROCEEDINGS OF THE ACADEMY OF [Sept., 



eastern American species, and possibly indigenous. Alexander Mac- 

 Elwee (No. 2,165A, Herb. Philadelphia Museums), May and June, 1901 ; 

 Canhy and Sargent, September, 1902; Sfnith and Sargent, October, 1904. 



16. Crataegus porteri Britton. 



Bull. N. Y. Bot. Gard., I, 448 (1900); Torreya, IV, 39 (1904). 



Glabrous. Leaves oblong-ovate to oval, long-pointed and acuminate 

 at the apex, concave-cuneate and often unsymmetrical or full and 

 rounded at the entire base, finely doul^ly serrate above, with straight 

 or slightly incurved teeth, and divided above the middle into 4 or 5 

 pairs of short acute lobes, tinged with red when they unfold, about half- 

 grown when the flowers open the middle of May and then membrana- 

 ceous, light yellow-green above, and rather paler below, and at maturity 

 coriaceous, dark blue-green and very lustrous on the upper and dull or 

 pale blue-green on the lower surface, 6-7 cm. long and 3.5-5 cm. wide, 

 with stout yellow midribs and slender primarj- veins extending obliquely 

 to the points of the lobes, turning dull vinous red in the autumn; 

 petioles slender, grooved on the upper side, slightly wing-margined at the 

 apex, sparingly glandular, with minute deciduous glands, and 2-3 cm. 

 in length ; stipules linear, glandular, fading brown, caducous. Flowers 

 1-1.2 cm. in diameter, on slender elongated pedicels, in mostly 5-7-flow- 

 ered lax corymbs, with linear to oblong-obovate glandular bracts and 

 bractlets persistent until after the petals fall ; calyx narrowh^ obconic, 

 the lobes narrow, elongated, acuminate, entire, tipped with minute 

 dark glands, reflexed after anthesis; stamens 20; anthers small, pale 

 yellow; styles 3 or 4. Fruit ripening early in October, on slender pedi- 

 cels, solitary or in few-fruited clusters, pyriform, sometimes becoming 

 short-oblong when fully mature, dark crimson marked by small dark 

 dots, 1-1.2 cm. long and 9-10 cm. wide; calyx not greatly enlarged, 

 with a short tube, a broad deep cavity, and closely appressed lobes 

 mostly persistent on the ripe fruit ; flesh yellow, dry and mealy ; nutlets 

 3 or 4, narrowed and pointed at the ends, prominently ridged on the 

 back, with a broad grooved ridge, red-brown, about 8 mm. long and 

 5 mm. wide. 



A shrub 3-4 m. high, with numerous stout erect stems, and slender 

 nearly straight branchlets marked by occasional large pale lenticels, 

 pale yellow-green when they first appear, and dull reddish-brown dur- 

 ing their first season, becoming very dark gray-brown the following 

 year. 



Monroe county: Borders of woods in low moist soil near Tanners- 

 ville, Britton and Porter, July 4, 1896; Canhy and Sargent, September, 

 1902; W. M. Canhy, May, August and October, 1903. 



