122 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
Panicum ctenodes majus Trin. Gram. Icon. 2: pl. 171. f. A. 1829. In the descrip- 
tion of P. ctenodes a larger variety is referred to and figure A of the plate represents 
this form. It does not appear certain that Trinius intended to name this in this way, 
but in the explanation of the figure ‘‘ad specimen Brasiliense’’ he uses the term “‘ Var. 
major,’’ and Kunth@ cites the name as ‘‘Panicum ctenodes var. major.’’ The type 
is in the Trinius Herbarium. It is a shoot without a label, lying on a sheet of speci- 
mens of P. stoloniferum from Brazil and appears to be the basis of figure A. One of 
the loose labels may belong to this specimen. 
Panicum stoloniferum major[us] Kunth, Rév. Gram, 2: 389. 1831. Based on Pan- 
icum ctenodes majus Trin. 
Panicum brachyclados Reichenb.; Trin. Mém. Acad. St. Pétersb. VI. Sci. Nat. 1: 
251. 1834. This is given as a synonym under P. frondescens Meyer, the authorship 
being given as ‘‘Rehbch. in Weig. hb. Surin.’’ The type, in the Trinius Herbarium, 
is labeled ‘‘ Panicum (Echinochloa) brachyclados. Surinam. ex herb. Reichenb.”’ 
Panicum kegelii Steud. Syn. Pl. Glum. 1: 65, 1854. ‘‘Guatemala.’”’ There is a 
specimen in the Berlin Herbarium bearing this name, collected in Guatemala by 
Kegel (no. 12716), which may be the type. No specimen of this 
was seen in the Steudel Herbarium. 
Panicum umbrosum Salzm.; Steud. Syn. Pl. Glum. 1: 65. 1854, 
not Retz. 1786. This is given as a synonym under P. stoloniferum 
Poir. The type, in the Paris Herbarium, is from Bahia, Brazil. 
DESCRIPTION. 
Culms ascending from a decumbent or creeping base, less freely 
branching than in P. stoloniferum, 30 to 50 cm. high, compressed, 
glabrous except below the panicle or sometimes with two lines of 
pubescence toward the summit of the internodes; nodes black; 
sheaths shorter than the internodes, densely ciliate, otherwise glab- 
rous; ligules nearly obsolete; blades 5 to 11 cm, long, 12 to 20mm. 
wide, acuminate, narrowed toward the base, glabrous; panicles 5 to 11 cm, long, 
usually less than one-third as wide, rather compact, the numerous, approximate 
racemes ascending or somewhat spreading, the lower 10 to 25 mm, long; spikelets 
2.6 to 2.8 mm. long, about 0.6 mm. wide and 1 mm. thick, glabrous; first glume 
scarcely one-third the length of the spikelet, acute, scabrous on the midnerve; second 
glume and sterile lemma subequal, somewhat boat-shaped, acute, the sterile palea 
about two-thirds as long as its lemma; fruit 1.6 mm. long, 0.5 mm. wide, pointed, 
short-stipitate. 
This species resembles P. stoloniferum, but is larger in all its parts, while the numer- 
ous racemes are usually aggregated into a rather compact panicle. 
The spikelets of this species and of P. stoloniferum, with their somewhat boat-shaped 
second glume and sterile lemma, suggest species of Sacciolepis. In this species the 
stipitate fruit also shows an approach to that genus, but the habit is wholly different. 
Fia. 115.—P. fronde- 
scens, From type 
specimen. 
DISTRIBUTION. 
Moist woods, Mexico to Brazil and Peru. 
Mexico: Papantla, Liebmann 405; St. Sebastian, Rovirosa 497. 
GuATEMALA: Dept. Peten, Walker 1138. 
Trintpap: Broadway 2371. 
British GuIANA: Meyer (Trinius Herb.). 
Durcw Guiana: Weigelt (Trinius Herb.); Hering (Acad. Phil. Herb.). 
FrencH Guiana: Sagot 689 (Gray Herb.). 
a Rév. Gram, 2: 389. 1831. 
