124 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
DESCRIPTION. 
Culms ascending from a decumbent base, becoming spreading and much-branched, 
somewhat compressed, the line of pubescence sparse or wanting; sheaths densely 
papillose-ciliate, otherwise glabrous; blades 4 to 
10 cm. long, 10 to 18 mm. wide, lanceolate, acu- 
minate, narrowed to the rounded base, more or 
less pilose on both surfaces; panicles 5 to 12 cm. 
long, the few, distant, racemes 0.8 to 2 cm. long, 
ascending or finally spreading; spikelets 3.6 mm. 
long, about 1 mm. wide, pointed; first glume 
scarcely one-third the length of the spikelet, his- 
pid along the midnerve and margin; second glume 
shorter than the sterile lemma, 7-nerved, hispid, 
the hairs longer toward the summit and margin, 
the sterile lemma 5-nerved, hispidulous and along 
Fic. 117.—P. biglandulare. Fromtype the margins hispid, bearing at either side of the 
specimen. midnerve a crateriform gland, these more promi- 
nent than in P. pulchellum, the sterile palea nearly 
as long as its lemma, hispidulous; fruit 2.4 mm. long, 0.7 mm. wide, elliptic, minutely 
stipitate. 
In the original description of P. biglandulare the margins of the sheaths are de- 
scribed as ‘‘clothed with glands bearing branching hairs.’’ The hairs are found to be 
simple and arising from papillae. 
DISTRIBUTION. 
Among bushes, mountains of Mexico and Guatemala. 
Mexico: Near Pinabete, Nelson 3781. 
GUATEMALA: Coban, Tuerckheim IT 1956. 
Parviglumia.—Plants erect or ascending, usually from a decumbent base; culms 
slender; sheaths densely ciliate and with a dense ring of pubescence at the 
summit; ligules less than 0.5 mm. long; blades firm, lanceolate, constricted 
into a very short petiole-like base, and having a thin, white, cartilaginous 
margin; panicles light green, with few, compactly flowered branches; spike- 
lets not over 2 mm. long, obovate, obtuse, glabrous, the first’ glume usually 
about one-fifth the length of the spikelet; fruit, except in P. parviglume, with 
scattered, appressed, silky hairs. 
Besides the three here given two Brazilian species belong in this group: 
P. trichidiachne Doell¢ and P. schiffneri Hack.,6 and also P. conchatum 
Fourn.¢ described from a Mexican specimen.@ 
Blades 12 to 16 cm, long, 2 to 3. cm. wide; fruit glabrous... .. 70, P. parviglume. 
Blades not over 10 cm. long nor 1.8 em. wide; fruit with 
scattered silky hairs. 
Blades scabrous on the upper surface, not faleate.......- 68. P. virgultorum. 
Blades sparsely hispid on the upper surface, faleate...... 69. P. schmitzit. 
4In Mart. Fl. Bras. 2°: 339. pl. 49. 1877. 
b Denkschr. Math.-Naturw. Akad. Wiss. Wien 79: 11. 1906. 
¢ Mex. Pl. 2: 25. 1886. 
dSee P. conchatum Fourn. page 329. 
