192 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
9. ANDROPOGON L. Sp. Pl. 1045, 1753. 
Racemes numerous in a leafless terminal panicle................- 7. A. leucopogon. 
Racemes | to 4, solitary or fascicled from spathes. 
Racemes solitary. 
Spikelets awnless ..............0000 cece cece eee cece ee eee ll. A. spathiflorus. 
Spikelets awned. 
Outer glume of sterile spikelet conspicuous and bract- 
like 2.2.0.2... eee eee eee eee 4. A. fastigiatus. 
Outer glume not conspicuous. 
Plants annual; racemes delicate .............-.- 2. A. brevifolius. 
Plants perennial; racemes not delicate. 
Racemes cylindrical, stiff and spike-like. 
Sterile pedicel ciliate its entire length; 
spikelets 5 to 6 mm. long......-...-- 10. A. semiberbis. 
Sterile pedicel ciliate only atapex; spike- 
lets 4mm. long..............--...-- 12. A. tener. 
Racemes zigzag, axis lax and slender; spike- 
lets about 3 mm. long. 
Racemes conspicuously villous.......... 6. A. gracilis. 
Racemes sparsely villous, spikelets about 
6 mm. long...........----2.-----+6-5- 3. A. cubensis. 
Racemes 2 to 4 from each spathe. 
Spathes numerous in a large corymb. 
Spikelets awnless .............. 2.0.2 c0e eee cece eee 1. A. bicornis. 
Spikelets long-awned...........2 22... e eee eee ee 5. A. glomeratus. 
Spathes scattered or the inflorescence naked and terminal. 
Racemes shorter than the spathe...................- 13. A. virginicus. 
Racemes naked, terminal. 
Spikelets awned.................2..-2---0-00-- 9. A. nashianus. 
Spikelets awnless...............222-2-2202000- 8. A. leucostachys. 
1. Andropogon bicornis L. Sp. Pl. 1046. 1753. 
Arroyo Galiano, 0’ Donovan HC 5217; Santiago de las Vegas, Wilson 439; Pinar del 
Rio, Palmer & Riley 86; Isle of Pines, Curtiss 294; Retiro, in Savannas, Wright 3902; 
El] Guama, Palmer & Riley 95; Nueva Gerona, Palmer & Riley 1125; without locality 
(1865) Wright 1555; Herradura, Hitchcock in 1906; Cienfuegos, Combs 265 in Gray 
Herbarium; Madruga, Britton & Shafer 773 in Herb. N. Y. Bot. Gard. 
Wright’s 770 from eastern Cuba (1859) is A. bicornis as shown by the specimen in 
Grisebach’s herbarium. 
Wright’s 1555 as distributed consists in part of Andropogon bicornis and in part of 
A.glomeratus. The latter is distinguished by the long-awned spikelets. 
2. Andropogon brevifolius Sw. Prod. 26. 1788. 
Madruga, Curtiss 530;- without locality, Wright 1558; Herradura, Hitchcock in 1906. 
The Wright specimen in the National Herbarium bears a blank label of 1865. No. 
1558 in the Grisebach Herbarium is from eastern Cuba, 1859, but the plant is 
A. tener (there has probably been some misplacement of labels here). In the latter her- 
barium is a specimen from western Cuba, 1863, with the secondary number 925, 
upon which Grisebach has marked ‘“*=1558.’? One sheet of Wright 1558 in the Gray 
Herbarium is A. tener, the other A. brevifolius, from ‘‘Pinales San Diego de Bajios, 
Nov. 16.” 
3. Andropogon cubensis Hack. Flora 68: 121. 1885. 
Without locality, Wright 3898. 
This number was not seen by Grisebach, but is listed in Sauvalle’s Flora Cubana 
without specific name. 
