﻿1903] THE GENUS CRATAEGUS IN DELAWARE lor 



petioles wing-margined, /-S"""" long, rather shorter than the 

 foliaceous lunate acuminate coarsely glandular-serrate stipules. 

 Flowers in compact many-flowered thin-branched compound 

 corymbs covered with long scattered pale caducous hairs ; calyx- 

 tube narrowly obconic, the lobes narrow, acuminate, entire or 

 occasionally obscurely glandular-serrate, reflexed after anthesis; 

 stamens 20 ; styles 3-1;. Fruit oblong, full and rounded at the 



ends, bright crimson marked by numerous large pale dots, 1-3*^™ 

 long, 8-12™™ wide ; calyx prominent with a short tube, a broad 

 deep cavity, and lanceolate lobes abruptly narrowed from broad 

 bases, appressed ; flesh thin, greenish, dry and mealy; nutlets 

 3-5, thick, obtuse, prominently ridged on the back, with a broad 

 rounded ridge, g-io™™ long. 



An arborescent shrub 4-5™ high, with spreading branches and slender 

 nearly straight or slightly zigzag branchlets marked by large oblong pale 

 lenticels, pale yellow-green at first, light red-brown and lustrous during their 

 first season, becoming gray-brown in their second year, and armed with many 

 stout straight or slightly curved spines 5-6*=™ long. Flowers from the middle 

 to the end of May. Fruit ripens toward the end of September and in the 

 beginning of October. 



Banks of the spillway of Dean & Pillings's mill south of Stanton Station, 

 /. T. Pennypacker, May 31, T902, W. M. Canby\ June 2f? and Sept, 27, 1902. 



PRUINOS^. 



I 



Stamens 20, 



Crataegus pruinosa K. Koch, Sargent, Silva N. Am. 13: 68. 



/. 648, 



W 



I goo, 



Elliott's Hill near Wilmington, October 1899; fields near Wilmington. May 

 I900; race bank below Stanton, September 1902; fence rows near Wilming- 



W, M, Canbv, Common. 



Crataegus arcana Beadle, Biltmore Bot. Studies i*: 122. 

 April 1902. — Except by its slightly smaller flowers, I can- 



Crataegi 



a 



western North Carolina, a common shrubby thorn of northern 

 Delaware and eastern Pennsylvania, with thin leaves cuneate at 

 the base except on vigorous shoots, twenty stamens, pale rose or 

 light purple anthers, and fruits often obconic at the base and 

 conspicuously swollen or mamillate below the middle. 



