HITCHCOCK AND CHASE TROPICAL NORTH AMERICAN PANICUM, 489 



Fig. 57.— p. altum. From 

 type specimen. 



line, open, the slender scabrous branches aacending and spreading, fascicled, some 



naked at base, with short branchlets intermixed; spikelets rather short-pediceled, 3.2 



to 4 mm. long, about 1.2 mm. wide, tm'gid, glabrous, 



the glumes and sterile lemma strongly nerved, pointed, 



somewhat keeled, usually widely gaping, the first 



glume about two-thirds the length of the spikelet, 



the second glume and sterile lemma exceeding the 



fruit, subequal; fruit 2 to 2.2 mm. long, 1 mm. wide, 



elliptic. 



Type in the U. S. National Herbarium, no. 693326, 

 collected in moist sandy soil, near sea beach on Point 

 Chame, Province of Panama, September 18, 1911, by 

 A. S. Hitchcock (no. 8167). 



In the inflorescence this species closely resembles 

 P. virgatuvi, but in habit it differs distinctly. It 

 grows in masses like large reeds such as Phragmites but is straggling and much 

 tangled at base. 



DISTRIBUTION. 



Sandy marshes or flats near the seacoast, British Honduras to Trinidad. 



British Honduras: Manatee Lagoon, 

 Pech 123 (Gray Herb.). 



CostaEica: Buenos Aires, Tonduz3619. 



Panama: Point Cham^, Eitchcoch 8167. 



Trinidad: Near Port of Spain, Eitch- 

 coch 10053. Icacos, Eitchcoch 10154. 

 Three miles south of Cedros, Eitch- 

 coch 10159. 



Tobago: Plymouth, Eitchcoch 10233. 

 Fig. 58.-^istnJi?ution of P. altum. _ Pigeon Point, Broadway 3068. 



Panicum havardii Vasey, Bull. Torrey 

 Club 14: 95. 1887; Contr. U. S. Nat. Herb. 

 15: 93. 1910. 



distribution. 



Arroyos and sand hills, southwestern 

 United States and northern Mexico. The 

 type specimen from Texas. 



Chihuahua: Paso del Norte (Judrez), 



Pringle 1124. -pia. 59.— Distribution of P. liavardii. 



43. Panicum amarulum. Hitchc. & Chase. 

 Panicum amarulum Ilitchc. & Chase, Contr, U. S. Nat. Herb. 15: 96. 1910. 



DISTRIBUTION. 



Sandy seashores and coast dunes, 

 southeastern United States, Bahamas, 

 and Cuba. The type specimen from 

 Virginia. 



Bahamas: Great Bahama, Britton 

 & llillspaugh 2739. New 

 Providence, Britton & Brace 

 307, 493 (all Field Mus. Herb.). 



Cuba: Camaguey, Shafer 2735. 



Fig. CO. — Distribution of P. amarulum. 



