500 PROCEEDINGS OF THE AMERICAN ACADEMY. 



axiUaris Beauv. Agrost. 166, Atlas 15, t. 24 f. 2 (1812).— Forest, 

 Toledo, September 12, 1906, M. E. Peck, no. 507. 



Aristida divaricata Humb. & Bonpl. ex Willd. Enum. Hort. 

 Berol. 99 (1809).— Pine ridge near Manatee Lagoon, July 18, 1905, 

 M. E. Peck, no. 72. 



Aristida pseudospadicea, sp. nov., perennis, dense caespitosa, circa 

 80 cm. altitudine, radicibus fibrosis. Culmi erecti, tenues sed rigidi, 

 basin versus aliquid ramosi, supra simplices, albo-virides, ad nodos 

 purpurascentes, oninino glabri. Vaginae e basi imbricata tumidius- 

 cula paidlum angustatae, in parte superiori culmos laxissime includ- 

 dentae vel patentes, quam internodia multo breviores, glabrae, ad 

 folii junctionem angulo recto abruptissime contractae et cum annulo 

 atro-brunneo cinctae. Ligula annularis brevis hispida in auriculas 

 vaginae procurrens, circa. 0.2 mm. longa. Folia baseos superioribus 

 similia, erecta, plana vel conduplicata, longe setaceo-acuminata, 8-30 

 cm. longa, 1-2 mm. lata; lamina subtus glabra, supra sparse longe 

 tenuiterque pilosa basin versus pilis crebrioribus instructa. Inflores- 

 centia panicula simplex, gracilis; 20-26 cm. longa, 2-4 cm. diametro; 

 radiis in axillis solitariis (per occasionem secundo breviore), adpresso- 

 ascendentibus vel paullo patentibus, inferioribus remotis ; axe radiisque 

 glabris. Spiculae glabrae, albo-virides vel paullum albo-violaceae, 

 9-11 mm. longae, circa 1 mm. diametro, callo obconico in summa parte 

 barbato, circa 1 mm. longo; glumae carinatae, 1-nervatae, gluma 

 prima in nervo scabra, acuminata, ciuam secunda aliquanto breviori, 

 gluma secunda aristato-acuminata vel paullum bifida cum arista l>revi; 

 lemma quam gluma secunda longius, ad apicem aliquid tortum, 

 scabrum, partibus tribus aristae divaricatis, subaequantes vel laterali- 

 bus multo brevioribus, parti media ad 35 mm. longa; palea circa 1 mm. 

 longa. — Type (in the Gray Herb.) and only specimen seen, pine ridge 

 near Manatee Lagoon, June 11, 1905, M. E. Peck, no. 31. A. pseudo- 

 spadicea is most nearly allied to A. spadicea HBK. from which it differs 

 in its more slender habit, absence of flat curled basal leaves, long-pilose 

 upper leaf-surface and smaller spikelets. Similar differences separate 

 it from A. arizonica Vasey. The comparatively long callus separates 

 it at once from A. tincta Trin. & Rupr. which has a very short one. 

 I wish to thank Mrs. Chase for comparing the material with that at 

 Washington. 



Sporobolus cubensis Hitchc. Contr. U. S. Nat. Herb. 12: 237 

 (1909).— Pine ridge, Ycacos Lagoon, March 5, 1907, M. E. Peck, 

 no. 694. A Cuban and Porto Rican species apparently new for Cen- 

 tral America. 



