396 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



103. SCLEROPOA Griseb. 



Spikelets small, loosely many -flowered ; glumes and lemmas firm with scarious 

 tips. 



1. Scleropoa rigida (L.) Griseb. Spic. Fl. Rum. 2: 431. 1844. 



Poa rigida L. Amoen. Acad. 4: 265. 1759. 



A low-spreading glabrous annual, usually not over 10 or 15 cm. tall, with 

 soft linear blades and stiff spikelike few-flowered panicles. 



Sparingly introduced in the United States. Frequent in Bermuda. Originally 

 described from Europe. 



104. BROMUS L. 



Spikelets several to many-flowered ; glumes unequal, shorter than the florets ; 

 lemmas convex or keeled, 5 to 9-nerved, awnless or awned from between two 

 minute teeth. 



Awn of lemma longer than the body 1. B. sterilis. 



Awn of lemma short or none 2. B. unioloides. 



1. Bromus sterilis L. Sp. PI. 77. 1753. 



A weedy pubescent slender annual, about 50 cm. tall, with a nodding panicle 

 of long-awned spikelets, the scabrous awns commonly 5 cm. long. 



Waste places, sparingly introduced in America. Originally described from 

 Europe. Found in the Blue Mountains of Jamaica. 



2. Bromus unioloides H. B. K. Nov. Gen. & Sp. 1: 151. 1816. Rescue grass. 

 Annual, commonly 1 meter tall, with velvety sheaths and large open drooping 



panicles, the strongly flattened spikelets 2.5 to 3.5 cm. long. 



Cultivated in the southern United States and occasional as an escape. Origi- 

 nally described from Ecuador. Introduced in Jamaica (Hope Grounds and 

 Cinchona ) . 



105. LOLIUM L. # 



An Old World genus with several-flowered spikelets, sessile on opposite sides 

 of the slender axis, the glume next the axis wanting, represented by one 

 specimen from Jamaica (Hart 739, without locality) of L. multiflorum Lam., 

 with awned florets exceeding the glume, and by two from Cuba (Leon 1583, 

 Calvario, and Leon 5052, Vibora-Habana) of L. temulentum arvense (With.) 

 Bab., with awnless florets exceeded by the glume. 



106. HORDEUM L. 



Spikelets 1-flowered, in clusters of 3 at each joint of an articulate rachis, the 

 middle spikelet sessile, perfect, the lateral spikelets stipitate, reduced to the 

 awnlike glumes ; glumes and lemmas awned. 



1. Hordeum pusillum Nutt. Gen. PI. 1: 87. 1818. 



A low, usually branched annual with cylindrical spikes 3 to 8 cm. long, a 

 part of the glumes dilated above the base. 



Open dry ground, western United States, but introduced eastward. Originally 

 described from the Missouri Valley. Found in Bermuda. 



Parian a sylvesteis Nees (Agrost. Bras. 295. 1829), a Brazilian species, is 

 mentioned by Grisebach 1 as having been found in St. Vincent by Guilding, 

 " perhaps introduced." 



1 Fl. Brit. W. Ind. 528. 1864. 



