48. 
4, Fruit hard and rigid; margins of lemma inrolled. 
(Also, spikelets placed with the back of the 
lemma toward the rachis, or spikelets pedicellate 
in panicles). 
6. First glume wanting; spikelets plano-convex, 
in: spiikeldike jracemes)aj aie. sieielels steieis|s shele lee slelecer nn wbaspalum 
6. First glume present; spikelets not plano- 
convex, in panicles. 
7. Spikelets on short pedicels; second glume 
inflated like a sac near the base. 
Expected (Sacciolepis). 
7. Spikelets on long pedicels; second glume 
MOVE, ANF MACS Me cvelevoneta\iesclevershe o) eeeelencverewersrs eeisiceim ane Cum 
Cenchrus 
Cenchrus tribuloides L. Sandbur 
Ivy Neck. Infrequent on sandy beach on Rhode River shore of 
Cheston Peninsula. Associate species: Strophostyles helvola, Spartina 
alterniflora, Cakile edentula. Higman 1013. 
Setaria 
1. Bristles of involucre at least 5. (Also, panicle 
dense, spikelike). 
2. Plants with short, knotty rhizomes; spikelets 
about 2.5 mm. long; palea reduced; plant perennial. 
Expected (S. geniculata). 
2. Plants without rhizomes; spikelets about 3 mm. 
long; palea developed; plant annual................ S. glauca 
1. Bristles of involucre 1 to 3, or appearing more by 
abortion of spikelets. 
3. Bristles retrorsely scabrous. Expected 
(S. verticillata). 
3. Bristles antrorsely scabrous. 
4, Fertile lemma coarsely transversely rugose; 
spikelerseabout 3 mm.) LOng.c ccie oc cwcics se vies cris) Oe faberia. 
4, Fertile lemma smooth or slightly rugose; spikelets 
not more than 2.5 mm. long. Expected (Ss. viridis). 
