1906] Hitchcock, — Notes on Grasses 209 



Panicum unciphyllum var. thinium Hitchc. & Chase, var. nov. 



Differs from P. unciphyllum as follows: Culms shorter, not over 

 30 cm. high, in larger tufts, pubescence denser and longer; early 

 becommg profusely branched and widely spreading, the small erect 

 blades with scattered long stiff hairs on the upper surface; spikelets 

 slightly smaller, 1.3-1.4 mm. long, very turgid, obtuse. 

 Dry sands, New Jersey. 



Type Chase 3577 in National Herbarium. In mats, sandy, open 

 ground, Tom's River, N. J. July 28, 1906; collected by Agnes Chase. 

 Distribution: Atsion, Chase 3562; Tom's River, 3576 and 3577; 

 Forked River, 3581. 



This form seems to be included in the description of P. psammoph- 

 ilum Nash (Bull. Torr. Bot. CI. 26: 576. Nov. 1899, not Welw. 

 Jul}^ 1899) but the type, Clute 175 in N. Y. B. G. herbarium, is P. 

 unciphyllum Trin. (P. columhianum Scribn.) 

 P. patulum (Scribn. & Merr.), comb. nov. 



P. Nashianum patulum Scribn. & Merr. 1900. U. S. D. A. Div. 

 Agrost. Circ. 27: 9. 



S. E. Va. to Fla., near the coast. 

 Panicum aculeatum Hitchc. & Chase, sp. nov. 



In very large clumps, culms slender, 0.7-1 m. high, ascending, 

 scabrous, harshly pubescent below; sheaths papillose-hispid with 

 stiff sharp-pointed hairs, a puberulent ring at the summit, uppermost 

 usually glabrous; ligule minute, membranaceous, ciliate; blades firm, 

 stiffly ascending or spreading, 12-20 cm. long, linear-lanceolate] 

 acuminate, involute-pointed, very scabrous on the upper surface and 

 toward the apex beneath, paler on the under surface; panicle rhombic 

 m outline, 8-12 cm. long, about as wide, few-flowered, the slender, 

 flexuous, fascicled branches ascending or spreading, naked at the base,' 

 scabrous, sometimes with a few viscid spots; spikelets 3 mm. long' 

 elliptical, minutely pubescent, first glume J to | as long as the spikelet] 

 1-nerved, acute, second glume and sterile lemma 9-11 nerved, abruptly 

 acute, slightly exceeding the fruit; fruit elliptic, 1.3X2.7 mm., minutely 

 umbonate. Autumnal state, I) ranching from the middle nodes, the 

 branches more or less divaricate, not much crowded. 



Allied to P. scab riu senium Ell.; panicle smaller, more open, fewer- 

 flowered, axis and branches scarcely viscid, spikelets larger, the glumes 

 only slightly exceeding the fruit. 



Type Chase 2520 in National Herbarium. In large clump by small 

 slough, border of woods, 'J'akoma Park, I). C, July 27, 1904; collected 

 by Agnes Chase. 



Distribution: District of Columbia: Takoina Park, Chase 2520; 



