24S JOrilXAL OF THE ARNOLD ARBORETUM [vol. i 



Palmer (Rocky banks of Cibolo Crock, No. 1147G), April 7, 1917 (Xo. 11187), Lin- 

 flnn(kK\ May ^.3, 191G, E. J. Palmer (along rocky banks of streams, No. 9899); 

 Comal County, Fischer's Store, June G, 1917 (limestone hills. No. 1*2197); Bandera 

 County, June 18, 19nt, E. J. Palmer (rocky banks of Scco Creek, No. 1()'-24j) ; north- 

 ern Edwards County, Octo])er 10, 1916, E. J. Palmer (No. 10970); Callahan County, 

 E. J, Palmer, Alay :5(), 19 IS (sandy uplands, No. K5806); Bnmn County, Brown- 

 wood, Octo])cr ^23, 19H>, E. J. Palmer (No. 11109); Jeff Davis County, Spraul 

 Ranch nt\ir Fort Davis, August 25, 1913, D. M. Andrews, 



Coininon on the rocky banks of streams on tlie Eilwards Plateau; and 

 interesting^ as the extreme southwestern representative of the Crus-galli 

 Group, and its only s])ecies in western Texas. 



Crataegus Cocksii, n. sp. 



T>eaves ()l)l(>ng-()bovate, acute or rounded at apex, gradually narrowed 

 and cnncate at base, finely serrate above the middle w^ith straight acuminate 

 teeth, glabrous, dark green and lustrous above, dull and i)aler behnv, 2.2-3 

 cm. long, 5 10 nnn. wide, w^ith a slender midrib, and slender primary veins 

 mostly within the {)arenr'hynia; petioles slender, about 4 mm. in length; 

 Ieav(\s at the ends of vigorous shoots broad-obovate, rounded or abruptly 

 short-jxn'nted at txpvx, tliicker, more coarsely serrate, often 4 cm. long and 

 2.5 cm. wide. Flowers opening early in April, 1.5-1.8 cm. in diameter, on 

 slender pedicels, in eom])act few-flowered glabrous corymbs; calyx-tube 

 broadly obconic, glabrous, the lobes oblong-ovate, gradually narrowed and 

 acuminate, entire, sparingly villose on the inner surface; stamens 20, small, 

 pale rose color; styles 2 or 3, surrounded at base by^ clusters of white hairs. 

 Fruit ripening in ()cto!>cr, on slender pedicels about G mm. long, in few- 

 fruitcnl clusters, short-oblong to slightly obovoid, crimson, lustrous, 8-12 

 mm. long, with s])rcading calyx-lobes mostly deciduous from the ripe fruit; 

 flesh yellow, dry and mealy; nutlets 2 or 3, ovoid, acute at aj)ex, rounded at 

 base, prominently ridged on the back, about 6 mm. long. 



A slender tree 7 or 8 m. high, with a tall stem 10-15 cm. in diameter, Avith 

 dark red-brown bark covered with small closely ap])ressed scales, slender 

 pendulous smooth branches and slender bright red-brown glabrous branch- 

 lets becoming gray in their second year, and armed with slender dark chest- 

 nut-brown lustrous spines 3-4 cm. in length. 



Louisiana: Winn Tarish, low rich woods at the marble quarry near Winnfield, 

 /?. S, Cochs and C. S. Sunjent, April 6 and Octob:T 9, 1913. 



I am glad to asst)ciate with this handsome tree, wdiich differs from other 

 Cock-Spur Thorns in its head of gracefully drooping branches, the name of 

 Reginald Woodhousc Soniers Cocks, professor of botany in Tulane Univer- 

 sity, tireless explorer of the flora of Louisiana. 



AESTIVALES 



This is one of the most distinct of the groups into which the species of 

 Crataegus can be dividcil. The species all have large flowers in few-flow- 

 ered simple corymbs, which open \vith or before the leaves unfold from Febru- 

 ary to A])ril; the stamens are normally 20, but flowers with 15 or 25 stamens 

 occasionally occur; the styles vary from 3-5. The fruit ripens in spring or 



