1922] SARGENT, NOTES ON NORTH AMERICAN TREES, X. 193 



No. 10802 (4b), September 25, 1916, No. 10798 (3a), September 25, 1911, No. 

 9307 (6), March 30, 1916, No. 10812 September, 25, 1916. 



Crataegus sutherlandensis var. spinescens Sarg., n. var. 



Differing from the type in its rather smaller leaves more pubescent 

 early in the season and often furnished below with conspicuous tufts of 

 white axillary hairs, and in its larger and more numerous spines. 



A shrub or small tree 4-5 m. high, forming thickets of slender stems 

 covered with dark scaly bark separating in small narrow scales, slender 

 zigzag branchlets armed with many slender straight spines from 3-6 cm. 

 in length. 



Texas. WilsonCounty, low woods near Sutherland Springs, C. S. Sargent 

 April 8, 1915; E. J. Palmer, Nos. 9294 and 10801 (5), March 30 and September 

 25, 1916 (type), No. 9308 and 10816 (5a) March 30 and September 25, 1916. 



Crataegus caerulescens (§ Pruinosae), n. sp. 



Leaves glabrous, acuminate at apex, broad-cuneate to rounded at base, 

 deeply laterally lobed with acuminate lobes, and finely doubly serrate 

 with straight or slightly incurved gland-tipped teeth; thin and fully grown 

 the end of May, and at maturity thick, dark blue-green and dull on the 

 upper surface, pale blue-green on the lower surface, 4-4.5 cm. long and 

 3-3.5 cm. wide, with a thin prominent midrib and slender primary veins 

 extending to the points of the lobes; petioles slender, furnished with occas- 

 ional glands, 1-1.5 cm. in length; leaves on vigorous shoots often truncate 

 at base and 4 cm. long and broad. Flowers opening the end of May, 1.8-2 

 cm. in diameter, on long slender pedicels in small compact corymbs with 

 narrow glandular-serrate bracts and bractlets; calyx-tube broad-obconic, 

 the lobes short, narrowed from a wide base, acuminate, glabrous; stamens 

 18-20; anthers white; styles 4 or 5. Fruit erect on slender pedicels, ripen- 

 ing in October, obovoid, gradually narrowed from near the top to the 

 acute base, dull red covered with a glaucous bloom, 1 cm. long and 7-8 mm. 

 in diameter, the calyx little enlarged with a short tube, a wide shallow 

 cavity broad in the bottom, and spreading and reflexed persistent lobes; 

 nutlets 4 or 5, rounded at apex, gradually narrowed and acute at base, 

 8-9 mm. long and 3 mm. wide. 



A plant with a single stem, now almost 3 m. high with slender nearly 

 straight glabrous branchlets yellow-green when they first appear, becoming 

 light red-brown at the end of their first season and dull gray-brown the 

 following year, and armed with numerous slender straight or slightly 

 curved chestnut brown spines 3-4.5 cm. in length. 



Arnold Arboretum No. 4572 (type), September 27, 1912, May 27, 1919. A 

 plant brought to the Arboretum by C. E. Faxon from Orient Heights, Breeds 

 Islands, Boston Harbor in the autumn of 1899. 



This plant is peculiar in the blue color of the leaves. It is most closely 

 related to C. Porteri Britton from Tannersville and Stroudsburg, Pennsyl- 

 vania, a species also with blue leaves, 20 stamens and white anthers, but 



