CRATAEGUS IN MISSOURI. 113 



pointing toward the base of the branch and 3.5-6 cm. long, 



and small pale winter-buds. 

 Rocky hills and barrens, Swan, Taney County, B. F. Bush, 



(No. 2 D type) May 19 and October 7, 1907, (No. 2) May 19, 

 1905, (Nos. 2 B, 2 C, 2 E, 2 F) May 16, 1907, (No. 366) June 9, 

 1898, (Nos. 43, 46, 52 and 107) June 18, 1899, (No. 509) Sep- 

 tember, 1899. 



4. Crataegus leiocladay n. sp. 



Glabrous with the exception of the hairs on the young leaves and caly^c- 

 lobes. Leaves ovate to oval, acuminate, gradually or abruptly narrowed 

 and concave-cuneate at the broad base, sharply often doubly serrate, with 

 long straight or incurved glandular teeth, and deeply divided into 4 or 5 

 pairs of slender acuminate spreading lateral lobes; nearly fully grown when 

 the flowers open the middle of May and then very thin, dark yellow-green, 

 lustrous and sparingly hairy above, with soft white hairs, paler, lustrous 

 and glabrous below, and at maturity thin but firm in texture, yellow-green, 

 lustrous on the upper surface, paler on the lower surface, 5-6 cm. long and 

 4—4.5 cm. wide, with conspicuous yellow midribs, and thin primary veins 

 extending obliquely to the points of the lobes; petioles slender, slightly 

 wing-margined at the apex, sparingly villose on the upper side while young, 

 soon glabrous, glandular, with numerous minute da^'k persistent glands, 

 1.2-1.6 cm. in length. Flowers 2-2.5 cm. in diameter, on long stout pedi- 

 cels, in mostly 2-4-flowered narrow corymbs, the elongated lowest peduncle 

 from the axil of an upper leaf; calyx-tube broadly obconic, the lobes 

 gradually narrowed from wide bases, long, slender, acuminate, rose-colored 

 and glandular at the apex, glandular-serrate to above the middle, glabrous 

 on the outer, sparingly villose on the inner surface, reflexed after anthesis; 



4 



stamens 5-10; anthers yellow faintly tinged with rose color; styles 3 or 4. 

 Fruit ripening late in September or early in October, on long drooping 

 pedicels, in 2- or 3-fruited clusters, subglobose to short-oblong, full and 

 rounded at the ends, green more or less flushed with red, 1-1.2 cm. in diam- 

 eter; calyx little enlarged, with a deep narrow cavity, and elongated 

 spreading and closely appressed or erect and incurved lobes; flesh thin, 

 green and hard; nutlets 2 or 3, rounded at the ends, ridged on the back, 

 with a broad high grooved ridge, 7-7.5 mm. long, and about 4 mm, wide, 



A slender shrub 2-3 m. high, with small stems covered with 

 smooth pale bark, small spreading branches, and very slender 

 slightly zigzag branchlets dark orange-green more or less 

 tinged with red and marked by pale lenticels when they first 

 appear, becoming bright chestnut-brown and very lustrous 

 in their first season and dull dark gray-brown the following 

 year, and armed with occasional stout straight spines. 



8 



