604 PROCEEDINGS OF THE ACADEMY OP [Sept., 



gray or gray-brown the following year, and armed with occasional 

 stout purple lustrous spines 5-5.5 cm. in length. 



Bucks county: Near Ridge Road, Rockhill, C. D. Fretz (No. 104, 

 type), September, 1899, ]\Iay and September, 1901; near Bruckers, 

 Rockhill, C. D. Fretz (No. 103), May and September, 1899. Rare. 

 21. Crataegus fretzii n. sp. 



Leaves ovate, acute, rounded or occasionally concave-cuneate or 

 rarely truncate at the broad entire base, coarsely doubly serrate above, 

 with straight or incurved glandular teeth, and more or less deeply 

 divided into two or three pairs of broad acute lateral lobes, nearly fully 

 groA\'n when the flowers open about the 20th of ]\Iay and then 

 membranaceous, light yellow-green, roughened by short rigid white 

 hairs and sparingly villose along the midribs on the upper surface, and 

 pale or glaucous and glal^rous on the lower surface, and at maturity 

 subcoriaceous, dark blue-green and scabrate or nearly smooth above, 

 pale bluish-green below, 6-8 cm. long and 4-6 cm. wide, with stout 

 yellow midribs and four or five pairs of thin primary veins ; petioles 

 slender, grooved on the upper side, narrowly wing-margined toward the 

 apex, sparingly glandular, villose while young, soon becoming glabrous, 

 1.5-2.5 cm. in length; stipules on leading shoots foliaceous, lunate, 

 coarsely glandular-serrate, about 5 mm. long, caducous. Flowers 

 about 1 cm. in diameter, on long slender glabrous pedicels, in lax 

 4- or 5-flowered corymbs; calyx-tube narrowly obconic, the lobes nar- 

 row, elongated, acuminate, tipped with dark red glands, entire or 

 occasionally furnished above the middle with a few small glandular 

 teeth, erect after anthesis; stamens usually eight; anthers small, dark 

 rose color; styles 2-4. Fruit ripening about October 1, on stout erect 

 pedicels, obovate, full and roimded at the apex, gradually narrowed 

 from above the middle to the slender base, greenish-yellow with a 

 crimson cheek destitute of bloom, 1.2-1.5 cm. long, 1-1.2 cm. broad; 

 calyx little enlarged, without a tube, and with a wide shallow cavity, 

 and erect spreading lobes most deciduous before the fruit ripens; 

 flesh thin, yellow, dry and mealy; nutlets usually 4, thick, full and 

 rounded at the ends, rounded and conspicuously ridged on the back, 

 with a high deeply grooved ridge, 8-9 mm. long and 5 mm. wide. 



A broad arborescent shrub 7-8 m. high, with stout intricately 

 branched stems spreading into broad thickets. 



Bucks county: Durham, in low rich soil, C. D. Fretz (No. 151, type), 

 ]\Iay and September, 1901 ; Fretz and SeirgeyU, September, 1902. 



This interesting thorn resembles in foliage and in the number of the 

 stamens and the color of the anthers Cratcvgus coynpta Sarg., from 



