MALACEAE 



38; 



1. C. Phaenopyrum. 



2. C. uni flora. 



3. C. monogyna. 



6. A. Bartramiana (Pursh) Roem. {A. oligocarpa (Michx.) Ro^m.) 

 In cold swamps or wet rocky places: Lab. and Ont. to Pa. 

 and Mich. 



Confined in our area to peaks of the Catskills and in Monroe and 

 Schuylkill counties in Pa., all above 1,500 ft., usually up to 4,020 ft. 



A.humilis Wiegand (Rhodora 14: 141. 1912) a plant reported to be related to A. 

 spicata (Lam.) Dec. has be?n collected at West Point, N. Y., according to Professor 

 Wiegand. 



6. Crataegus L.* 



Leaves conspicuously deltoid-cordate, glabrous. 

 Leaves not deltoid-cordate; glabrous or pubescent. 



Petioles 2 mm. long; shrubs I--'. 5 mm. high, with slender 



straight spines. 

 Petioles more than 4 mm. long. 



Leaves deeply cut, the lobes sometimes as many as 15; 



thorns about 6 mm. long. 

 Leaves not deeply cut. 



A . Leaves cuneate, mostly broadest at the middle 

 or the apex. 

 Leaves broadest towards the apex. 



Leaves not impressed veined above, 

 shining. 

 Leaves serrate but not lobed. 

 Leaves somewhat irregularly lobed. 

 Leaves impressed veined above. 



Fruit ellipsoidal ; leaves bright yellow- 

 green. 

 Fruit short; leaves dull gray-green. 

 Leaves broadest at the middle. 

 Leaves impressed veined. 



Calyx lobes usually deeply cut; nut- 

 lets pitted on their ventral 

 faces. 

 Leaves dark green, glabrous and 

 shining above, coriaceous. 

 Fruit about 2 cm. in diam- 

 eter; stamens 10. 

 Fruit about 1.2 cm. in di- 

 ameter; stamens 15-20. 

 Leaves gray green, pubescent. 

 or dull above. 

 Calyx lobes scarcely cut; nutlets 

 with shallow pits on their ventral 

 faces. 



* Prepared with the assistance of Mr. W. W. Eggleston. The unsettled state of our 

 knowledge of the thorns and the comparatively scanty material of many of the species, 

 makes it advisable to omit the usual phytogeographical and ecological data in this genus. 

 The synonymy of the species here treated may be found in Britton and Brown's Illus- 

 trated Flora, ed. 2, Vol. 2, page 294. 

 26 



8. C. succulenta. 



9. C. neofluvialis. 



10. C. Calpodendron. 



11. C. Brainerdi. 



