914 CONTRIBUTIONS FROM THE NATIONAL 
HERBARIUM. 
There are two additional labels with Wright 3879 in the Sauvalle Herbarium, ‘“‘ Low 
marshy savannas, Guanimas, Nov.,’’ and ‘‘Margin of mangrove swamp, Trinidad, 
Mar. 13.’ 
32. PANICUM L.. Sp. PI. 55. 1753. 
Axis of the panicle branches extending beyond base of uppermost 
spikelet as a short point or bristle... 2... ..0..02..22.0.2.-.-. 
Axis of panicle branches not extended into a bristle. 
Inflorescence consisting of several spike-like, more or less 
secund racemes, 
Fruit smooth and shining; spikelets not over 1.5 mm. 
long. (LAXUM GROUP.) 
Rachis pilose; pedicel short, subequal............ 
Rachis not pilose; pedicels unequal, panicle less 
regular. ......02.00222-0200000002 000022 eee ee eee 
Fruit transversely wrinkled; spikelets turgid. 
TANS GROUP.) 
(ReEp- 
Nodes bearded....................-..2---22-2--2 2. 
Nodes sometimes pubescent, but not bearded. 
Glumes and sterile lemma prominently trans- 
versely reticulate-veined.........0.0.0..... 
Glumes and sterile lemma not cross-veined, 
Spikelets hispidulous, pointed, first glume 
Spikelets glabrous, first glume truncate. 
Blades ovate-lanceolate, 5 to 10 mm. 
wide, 2 to 7 cm. long; prostrate- 
spreading......2...-2..2.---0...... 
Blades elongated, 10 to 20 cm. long, 
narrow, flowering culms erect or as- 
cending; 
erect-appressed racemes on an elon- 
gated axis; spikelets in 2 distinct 
inflorescence of numerous 
+ TOWS.. 22 ee 
Inflorescence a more or less diffuse panicle, sometimes nar- 
row and rather compact, but not consisting of spike- 
like racemes. 
Stems woody, resembling bamboos. 
GROUP.) 
Sheaths villous. 
Stems tall, blades | to 2 cm. wide, not distich- 
(DIvARICATUM 
OUS....222 2222222 eee 42, 
Stems creeping, blades distichous, 2 to 3 em. 
long, about 5 mm. wide, velvety........... 
Sheaths smooth or pubescent only. 
Panicle compact; blades ovate-lanceolate, 1.5 
to4om. wide, velvety-puberulent beneath; 
spikelets globular... 022.222.2022 2 002 
Panicle open, blades lanceolate, 
Stem creeping, sending up erect flowering 
eculms.......22 eee 19, 
Stem climbing or trailing. 
‘Panicle large and spreading, LO to 20 
em. long; blades 1.5 to 2.5 em. 
32, 
23. 
29. 
36. 
~ 
~ 
I 
~ 
/ 
P. 
~ 
~ 
- 
I 
~ 
~ 
~ 
P. 
P. 
P. 
P. 
2. 
P, 
. distantiflorum. 
pilosum. 
laxrum., 
.numidianum. 
. fasciculatum. 
adspersum., 
_ reptans, 
geminatum, 
swartzianum. 
rugelii, 
. compactum, 
grisebachit. 
. sloanei. 
