REPORT OF THE STATE ROTANIST IQO/ 35 



A tree sometimes 8 m high, with a trunk 2 m long and 1.5 dm in 

 diameter, covered with ridged and scaly gray bark, drooping and 

 widespreading- branches, and slender nearly straight glabrous 

 branchlets dull red and marked by pale lenticels when they first 

 appear, becoming bright chestnut-brown and lustrous in their first 

 season and pale gray-brown the following year, and armed with 

 few slender nearly straight chestnut-brown shining spines 3-3.5 

 cm long. 



Open thickets in clay soil, Belfast, Allegany co., Baxter and 

 Dewing (# 285, type), September 14, 1904, May 29 and September 

 14, 1905; ( ^ 212X), May 30, 1903, September 14, 1904, Septem- 

 ber 19, 1905. 



This interesting species, which is doubtfully referred to this 

 group, is named for Mr Vincent Dewing who with Mr Baxter has 

 carefully studied and industriously collected the large number of 

 species of Crataegus growing in several of the towns of the upper 

 Genesee valley in New York. 



Ill PRUINOSAE 



Fruit subglobose to short-oblong or obovate, red or green, often 

 slightly 5-angled, generally pruinose especially during the summer ; 

 flesh hard and dry ; leaves thin to subcoriaceous. 



Stamens 20 



Anthers rose color, pink or red 

 Leaves glabrous 

 Corymbs glabrous 



Corymbs many-flowered i C. p r u i n o s a 



Corymbs few-flowered 



Leaves cuneate at the base; fruit conspicuously 5 angle and 



mainmillate below the middle 2 C . arcana 



Leaves often rounded at the broad base; fruit not mammillate 

 Leaves subcoriaceous; flowers not less than 1.8 cm in 



diameter, on long pedicels 3 C. gracilis 



Leaves thin; flowers i. 2-1.4 cm in diameter, on short 



pedicels 4 C . a m o e n a 



Corymbs villose 5 C . c 1 i n t o n i a n a 



Young leaves roughened al):)vc by short white hairs 6 C . o b 1 i 1 a 



Anthers yellow 



Leaves glabrous 7 C. c o g n a t a 



Leaves slightly hairy above while young- 

 Leaves oblong-ovate; corymbs many-flowered; spines short and 



stout 8 C. formosa 



Leaves broadly ovate ; corymbs few-flowered ; spines long and 

 slender 9 C. leiophylla 



