SOME NEW PEXXSVLVANIAN THORNS. 



Bv ^V. W. Ashe, 

 Raleigh, X. C. 



Crat.egus arcuata sp. nov. A slender tree 5-7 ra. in height 

 with rather few erect or ascending branches forming an open oblong 

 crown and a short trunk, often i dm. thick, sparingly armed with 

 compound thorns ; the bark on the trunk dark gray and broken into 

 small scales, that on the branches ashen-gray and smoother. Twigs 

 at first pubescent, at length glabrate, red-brown, sparingly armed with 

 short thorns 3-4 cm. long ; the wood soft and white. The leaves 

 when young are appressed pubescent on the upper surface and on the 

 lower surface on the principal veins ; when mature they are glabrous 

 above, and below except in the axils of the veins, membranaceous, dark 

 green above, pale below, the blades broadly ovate or nearly orbicular 

 in outline, S-ii cm. long, 6-10 cm. wide, abruptly acute at apex, 

 rounded, truncate, or subcordate at base, coarsely and sharply double 

 serrate, with 2-3 pairs of short lateral lobes, the lowest with reflexed 

 tips, 4-6 pairs of slender divergent primary veins, the lowest pair 

 arcuate at the tips. Inflorescence a few-branched, 4-i5-flo\vered, 

 wide-spreading, 5-9 cm. wide villose corymb, the stout elongated 

 pedicels mostly 3-forked and 3-flovvered. The flowers, which appear 

 about the middle of May, though the flowering period is i)rolonged, 

 are from 20-25 ™'''''- "^^'ide, cup-shaped and on nodding pedicels ; calyx 

 villose, cup-shaped, the very narrow 5-7 mm. long serrate villose lobes 

 spreading after anthesis ; stamens 5-8, usually 5, anthers pink. The 

 fruit, borne in few-fruited clusters on long pendent slightly villose or 

 glabrate pedicels, is oblong-globular, about 13 mm. long, 11 mm. 

 thick, rounded at apex, slightly concave at base, scarlet, or mottled 

 with orange and russet, shining, glabrous or pubescent at apex, and 

 capped by the elongated spreading or reflexed brown lobes. 



Crat(Xi:;iis arcuata is common in parts of eastern Pennsylvania along 

 streams and in meadows and is often associated with the white ash and 

 American linden. It is related to C. Holmesiana Ashe (Journ. E. 



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