NORTH AMERICAN AMYGDALUS WIGHT 133 



one to four on each spur; calyx-tube campanulate with broadly ovate lobes 

 about 1 mm. long; petals white, obovate, about 3.5 mm. long. Fruit matur- 

 ing in June, globose, about 12 mm. long, 11 mm. broad and 10 mm. thick 

 when dry, the exocarp thin and dehiscing along the ventral edge ; stone turgid 

 and with a smooth surface, grooved along the dorsal edge, the ventral edge 

 rather thick with an inconspicuous groove a short distance from the margin. 



A low shrub with irregular, often zigzag, scarcely spinescent branches, 

 and grayish bark. It sometimes forms dense masses and occurs in Texas 

 from the vicinity of New Braunfels westward to Devils River and the Rio 

 Grande. It was originally described from "Hills and dry slopes between 

 San Antonio and New Braunfels." 



Specimens examined: Texas; Comanche Spring, New Braunfels, Lind- 

 heimer, No. 789, Mar., 1850. San Antonio, Mackensen, Feb. 20, and June, 

 1910. Valvada Co., C. S. Mason, May 10, 1910. Between New Braunfels 

 and San Antonio, Lindheimer, No. 401, Mar., 1850. San Antonio, Geo. 

 Thurber, Mar., 1853. San Felipe Creek, C. Wright, 1851. Without local- 

 ity, Lindheimer, No. 388. 



AMYGDALUS HARVARDII, W. F. Wight, sp. nov. 



Leaves obovate to oblong-obovate or sometimes fan-shaped on young 

 growth, 7 to 20 mm. long, 3 to 10 mm. broad, glabrous or sometimes finely 

 pubescent on both surfaces, usually somewhat pale below and under a lens 

 rather prominently reticulate veined, the margin conspicuously dentate toward 

 the apex, very rarely toothed below the middle, the teeth usually acute and 

 apparently glandless. Flowers appearing with the leaves and sessile; calyx 

 slightly pubescent, the tube about 2.5 mm. long, the lobes scarcely more 

 than 1 mm. long, entire and obtuse; petals not seen. Fruit sessile, nearly 

 globular, the pubescent exocarp dehiscent along one edge, when dry about 9 

 mm. long, 7 mm. broad and 7.5 mm. thick; stone about 8 mm. long, 6.5 mm. 

 broad and 7 mm. thick, rounded at the base and slightly pointed toward the 

 apex, the surface smooth except for indistinct grooves near the ventral edge. 



A shrub with rather rigid branches, stout spinescent branchlets and light 

 gray bark. The type specimen in the United States National Herbarium 

 was collected in fruit by V. Havard in July, 1883, in western Texas, east of 

 the Chisas Mountains, near Bone Springs. It was also collected by C. C. 

 Parry, J. M. Bigelow, Charles Wright and A. Schott on the Mexican Boun- 

 dary Survey under the direction of Major W. H. Emery, this specimen being 

 labeled "chiefly in the valley of the Rio Grande, below Donana." The 

 species is most closely related to Amygdalus microphylla H. B. & K. of 

 Mexico, but is easily distinguished by its broader, more obovate leaves as 

 well as by their reticulate venation and eglandular margins. 



