902 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. © 
Culms about 1.5 meters high; 
spikes inclosed at base by 
the sheath; clusters of 
spikes scattered along the 
upper part of the culm.... 14. A. virginicus. 
Culms about 60 cm. high; cluster 
of spikes long-exserted at 
the end of the culm....... 15, A, liebmanni. 
Spikes several or many (sometimes only two in A. pip- 
tatherus), aggregated on a short or elongated Axis, 
raised on a naked peduncle at the summit of the 
culm. 
Plants annual; culms weak and straggling............ 28. A. piptatherus. 
Plants perennial; culms erect or nearly so. 
Spikes few, not woolly, short-peduncled, loosely 
spreading .............202 22 eee eee eee eee 23. A. hirtifolius. 
Spikes usually numerous, woolly with long white 
or tawny hairs. 
Outer glume not pitted. 
Nodes bearded; plant stout. ..........-. 25. A. barbinodis. 
Nodes glabrous; plant more delicate...... 24. A. saccharoides. 
Outer glume of sessile spikelet with a pinhole- 
like pit about the middle. 
Spikes few, stiffly erect...............-. 22. A. wrightii. 
Spikes numerous, more loosely ascending. 
Spikes approximate, forming a flabel- 
. late cluster... 2.........0... 26. A. perforatus. 
Spikes in a dense oblong panicle, 15 
to 20 cm. long................ 27, A, altus. 
1. Andropogon brevifolius Swartz, Prodr. Veg. Ind. Occ. 26. 1788. 
Type locality, “Jamaica.” 
RanGE: Tropical regions of both hemispheres. 
HERBARIUM SPECIMENS FROM MEXIco: 
Stnatoa: Cerro Colorado, Brandegee in 1904. 
Jauisco: Guadalajara, moist fields, Pringle 1771; Rio Blanco, Palmer 593 in 1886; 
San Nicolas, sterile clay hill, Hitchcock 7217. 
Cotma: Alzada, Orcutt 4681. 
Moretos: Hills near Yautepec, Pringle 11210. 
2. Andropogon gaumeri (Nash). 
Schizachyrium gaumeri Nash, N. Amer. Fl. 17: 102. 1912. 
Type locality, “Izamal, Yucatan,’ the type specimen collected by Gaumer (no. 
1037). 
Rance: Known only from the type collection. 
3. Andropogon malacostachyus Presl, Rel. Haenk. 1: 337. 1830. 
Type locality, ‘‘Acapulco.”’ 
Rance: Southern Mexico and Central America. 
HERBARIUM SPECIMENS FROM MExIco: 
Jauisco: Guadelajara, dry gravelly soil, Pringle 4514. 
Pursia: Puebla, Nicolas in 1909. . 
GUERRERO: Balsas, along railroad, Hitchcock 6806. 
Yucatdn: Tekax, Gaumer 1134. 
