32 NORTH AMERICAN FLORA (VorumE 17 
spikelets, glabrous on the face, the back and margins copiously pubescent with golden-brown 
hairs; sessile spikelet brown-purple, about 5 mm. long, oblong, the first scale emarginate at 
the somewhat hyaline truncate apex, strigose on the back with brown hairs, the second scale 
as long as the first, obtuse, setose above, the third scale ciliate, the fourth scale acutely 
2-toothed for about one third its length, bearing a rather stout perfect awn 1.5-2 cm. long, 
the brown column straight, glabrous, about equaling the nearly straight subula; pedicellate 
spikelet reduced to a single narrowly linear scale which is glabrous and obtuse. 
TYPE LOCALITY: Mexico. 
DISTRIBUTION: Mexico. 
27. VETIVERIA Thouars; Virey, Jour. de Pharm. 13: 501. 1827. 
Mandelorna Steud. Syn. Gram. 359. 1854. 
Tall grasses with simple stems, narrow leaf-blades, and terminal panicles with the branches 
usually with many internodes and disposed in dense whorls. Spikelets in pairs, narrow, 
acute, of 4 scales, the one sessile and perfect, the other pedicellate and staminate. Sessile 
spikelet laterally compressed; first scale coriaceous or chartaceous, the margins inflexed or 
involute; second scale awned or awnless; third and fourth scales hyaline, the latter entire or 
shortly 2-toothed, muticous, mucronate, or short-awned from between the teeth. Pedicellate 
spikelet usually awnless, rarely awned. Stamens 3. Ovary glabrous. Stigmas plumose, 
linear, 2—4 times as long as the styles. 
Type species, Vetiveria odorata Virey. 
1. Vetiveria zizanioides (1,.) Nash, in Small, Fl. SE. U. S. 67. 1903. 
Phalaris zizantoides I,, Mant. 183. 1771. 
Andropogon squarrosus I,. £. Suppl. 433. 1781. 
Andropogon muricatus Retz. Obs. 3: 43. 1783. 
Vetiveria odorata Virey, Jour. de Pharm. 13: 501. 1827. 
Mandelorna insignis Steud. Syn. Gram. 359. 1854. 
Veliveria arundinacea Griseb. F1. Brit. W. Ind. 559. 1864. 
Sorgum zizanioides Kuntze, Rev. Gen. 791. 1891. 
Stems 2 m. tall or more; leaf-sheaths smooth and glabrous; blades 9 dm. long or less, 
4-10 mm. wide; panicle 2-3 dm. long, its slender ascending or nearly erect branches in dense 
whorls, readily disarticulating at the nodes, and with a long naked base; sessile spikelet 
about 4 mm. long, about as long as the internodes, the first scale minutely tuberculate-rough- 
ened, 2-keeled, the keels muricate, the second scale 1-nerved, the keel muricate, the fourth 
scale awnless or short-awned, the awn not exserted; pedicellate spikelet about as long as or a 
little shorter than the sessile one, sparingly muricate. 
TYPE LOCALITY : India. : 
DISTRIBUTION : Escaped from cultivation in Louisiana, Jamaica, Porto Rico, Guadeloupe, 
and Martinique, and in other parts of tropical America and elsewhere in tropical regions. 
28. CHRYSOPOGON Trin. Fund. Agrost. 187. 1820. 
Perennial or rarely annual grasses, with narrow leaf-blades, and terminal panicles, the 
branches usually bearing terminal clusters of 3 spikelets, or very rarely with a pair below, one 
spikelet sessile and perfect, the other 2 pedicellate, staminate or empty. Sessile spikelet 
laterally compressed, of 4 scales, the first and second scales involute, gaping at maturity, the 
third and fourth scales hyaline, the fourth with a perfect awn. Pedicellate spikelets dorsally 
compressed, awnless or awned. Stamens 3. Styles distinct. Stigmas plumose. 
Type species, Andropogon Gryllus L,. 
1. Chrysopogon pauciflorus (Chapm.) Benth.; Vasey, 
Grasses U. S. 20. 1883. 
Sorgum paucifiorum Chapm, Bot. Gaz. 3: 20. 1878. 
Chrysopogon Wrighttt Munro; Vasey, Descr. Cat. Grasses U. S. 29. 1885. 
Andropogon paucifiorus Hack. in DC. Monog. Phan. 6: 548. 1889, 
Rhaphis paucifiorus Nash, in Small, Fl. SE. U. S. 67. 1903. 
Annual, Stems 6-12 dm. tall, simple or somewhat branched; leaf-blades 2 dm. long or 
less, 2-10 mm. wide, papillose-hirsute above; panicle 2-3 dm. long, its branches erect or 
